module Sequel::Model::InstanceMethods

Sequel::Model instance methods that implement basic model functionality.

All of the model before/after/around hooks are implemented as instance methods that are called by Sequel when the appropriate action occurs. For example, when destroying a model object, Sequel will call around_destroy, which will call before_destroy, do the destroy, and then call after_destroy.
The following instance_methods all call the class method of the same name: columns, db, primary_key, db_schema.
The following accessor methods are defined via metaprogramming: raise_on_save_failure, raise_on_typecast_failure, require_modification, strict_param_setting, typecast_empty_string_to_nil, typecast_on_assignment, and use_transactions. The setter methods will change the setting for the instance, and the getter methods will check for an instance setting, then try the class setting if no instance setting has been set.

Constants

EXISTS_SELECT_

Attributes

_insert_values[R]

The hash of attribute values. Keys are symbols with the names of the underlying database columns. The returned hash is a reference to the receiver's values hash, and modifying it will also modify the receiver's values.

Artist.new(name: 'Bob').values # => {:name=>'Bob'}
Artist[1].values # => {:id=>1, :name=>'Jim', ...}

to_hash[R]

Artist.new(name: 'Bob').values # => {:name=>'Bob'}
Artist[1].values # => {:id=>1, :name=>'Jim', ...}

values[R]

Artist.new(name: 'Bob').values # => {:name=>'Bob'}
Artist[1].values # => {:id=>1, :name=>'Jim', ...}

Public Class Methods

new(values = OPTS) { |self| ... } click to toggle source

Creates new instance and passes the given values to set. If a block is given, yield the instance to the block.

Arguments:

values: should be a hash to pass to set.

Artist.new(name: 'Bob')

Artist.new do |a|
  a.name = 'Bob'
end

     # File lib/sequel/model/base.rb
1212 def initialize(values = OPTS)
1213   @values = {}
1214   @new = @modified = true
1215   _initialize_nil_instance_variables
1216 
1217   initialize_set(values)
1218   _clear_changed_columns(:initialize)
1219   yield self if defined?(yield)
1220 end

Public Instance Methods

==(obj) click to toggle source

Alias of eql?

     # File lib/sequel/model/base.rb
1259 def ==(obj)
1260   eql?(obj)
1261 end

===(obj) click to toggle source

Case equality. By default, checks equality of the primary key value, see pk_equal?.

Artist[1] === Artist[1] # => true
Artist.new === Artist.new # => false
Artist[1].set(name: 'Bob') === Artist[1] # => true

     # File lib/sequel/model/base.rb
1269 def ===(obj)
1270   case pkv = pk
1271   when nil
1272     return false
1273   when Array
1274     return false if pkv.any?(&:nil?)
1275   end
1276 
1277   (obj.class == model) && (obj.pk == pkv)
1278 end

Also aliased as: pk_equal?

[](column) click to toggle source

Returns value of the column's attribute.

Artist[1][:id] #=> 1

     # File lib/sequel/model/base.rb
1234 def [](column)
1235   @values[column]
1236 end

[]=(column, value) click to toggle source

Sets the value for the given column. If typecasting is enabled for this object, typecast the value based on the column's type. If this is a new record or the typecasted value isn't the same as the current value for the column, mark the column as changed.

a = Artist.new
a[:name] = 'Bob'
a.values #=> {:name=>'Bob'}

     # File lib/sequel/model/base.rb
1246 def []=(column, value)
1247   # If it is new, it doesn't have a value yet, so we should
1248   # definitely set the new value.
1249   # If the column isn't in @values, we can't assume it is
1250   # NULL in the database, so assume it has changed.
1251   v = typecast_value(column, value)
1252   vals = @values
1253   if new? || !vals.include?(column) || v != (c = vals[column]) || v.class != c.class
1254     change_column_value(column, v)
1255   end
1256 end

autoincrementing_primary_key() click to toggle source

The autoincrementing primary key for this model object. Should be overridden if you have a composite primary key with one part of it being autoincrementing.

     # File lib/sequel/model/base.rb
1301 def autoincrementing_primary_key
1302   primary_key
1303 end

cancel_action(msg=nil) click to toggle source

Cancel the current action. Should be called in before hooks to halt the processing of the action. If a msg argument is given and the model instance is configured to raise exceptions on failure, sets the message to use for the raised HookFailed exception.

     # File lib/sequel/model/base.rb
1309 def cancel_action(msg=nil)
1310   raise_hook_failure(msg)
1311 end

changed_columns() click to toggle source

The columns that have been updated. This isn't completely accurate, as it could contain columns whose values have not changed.

a = Artist[1]
a.changed_columns # => []
a.name = 'Bob'
a.changed_columns # => [:name]

     # File lib/sequel/model/base.rb
1320 def changed_columns
1321   _changed_columns
1322 end

delete() click to toggle source

Deletes and returns self. Does not run destroy hooks. Look into using destroy instead.

Artist[1].delete # DELETE FROM artists WHERE (id = 1)
# => #<Artist {:id=>1, ...}>

     # File lib/sequel/model/base.rb
1329 def delete
1330   raise Sequel::Error, "can't delete frozen object" if frozen?
1331   _delete
1332   self
1333 end

destroy(opts = OPTS) click to toggle source

Like delete but runs hooks before and after delete. Uses a transaction if use_transactions is true or if the :transaction option is given and true.

Artist[1].destroy # BEGIN; DELETE FROM artists WHERE (id = 1); COMMIT;
# => #<Artist {:id=>1, ...}>

     # File lib/sequel/model/base.rb
1341 def destroy(opts = OPTS)
1342   raise Sequel::Error, "can't destroy frozen object" if frozen?
1343   checked_save_failure(opts){checked_transaction(opts){_destroy(opts)}}
1344 end

each(&block) click to toggle source

Iterates through all of the current values using each.

Album[1].each{|k, v| puts "#{k} => #{v}"}
# id => 1
# name => 'Bob'

     # File lib/sequel/model/base.rb
1351 def each(&block)
1352   @values.each(&block)
1353 end

eql?(obj) click to toggle source

Compares model instances by values.

Artist[1] == Artist[1] # => true
Artist.new == Artist.new # => true
Artist[1].set(name: 'Bob') == Artist[1] # => false

     # File lib/sequel/model/base.rb
1360 def eql?(obj)
1361   (obj.class == model) && (obj.values == @values)
1362 end

errors() click to toggle source

Returns the validation errors associated with this object. See Errors.

     # File lib/sequel/model/base.rb
1366 def errors
1367   @errors ||= errors_class.new
1368 end

exists?() click to toggle source

Returns true when current instance exists, false otherwise. Generally an object that isn't new will exist unless it has been deleted. Uses a database query to check for existence, unless the model object is new, in which case this is always false.

Artist[1].exists? # SELECT 1 AS one FROM artists WHERE (id = 1)
# => true
Artist.new.exists?
# => false

     # File lib/sequel/model/base.rb
1383 def exists?
1384   new? ? false : !this.get(EXISTS_SELECT_).nil?
1385 end

extend(mod) click to toggle source

Ignore the model's setter method cache when this instances extends a module, as the module may contain setter methods.

Calls superclass method

     # File lib/sequel/model/base.rb
1389 def extend(mod)
1390   @singleton_setter_added = true
1391   super
1392 end

freeze() click to toggle source

Freeze the object in such a way that it is still usable but not modifiable. Once an object is frozen, you cannot modify it's values, changed_columns, errors, or dataset.

Calls superclass method

     # File lib/sequel/model/base.rb
1397 def freeze
1398   unless errors.frozen?
1399     validate
1400     errors.freeze
1401   end
1402   values.freeze
1403   _changed_columns.freeze
1404   this if !new? && model.primary_key
1405   super
1406 end

hash() click to toggle source

Value that should be unique for objects with the same class and pk (if pk is not nil), or the same class and values (if pk is nil).

Artist[1].hash == Artist[1].hash # true
Artist[1].set(name: 'Bob').hash == Artist[1].hash # true
Artist.new.hash == Artist.new.hash # true
Artist.new(name: 'Bob').hash == Artist.new.hash # false

     # File lib/sequel/model/base.rb
1415 def hash
1416   case primary_key
1417   when Array
1418     [model, !pk.all? ? @values : pk].hash
1419   when Symbol
1420     [model, pk.nil? ? @values : pk].hash
1421   else
1422     [model, @values].hash
1423   end
1424 end

id() click to toggle source

Returns value for the :id attribute, even if the primary key is not id. To get the primary key value, use pk.

Artist[1].id # => 1

     # File lib/sequel/model/base.rb
1430 def id
1431   @values[:id]
1432 end

inspect() click to toggle source

Returns a string representation of the model instance including the class name and values.

     # File lib/sequel/model/base.rb
1436 def inspect
1437   "#<#{inspect_prefix} @values=#{inspect_values}>"
1438 end

keys() click to toggle source

Returns the keys in values. May not include all column names.

Artist.new.keys # => []
Artist.new(name: 'Bob').keys # => [:name]
Artist[1].keys # => [:id, :name]

     # File lib/sequel/model/base.rb
1445 def keys
1446   @values.keys
1447 end

lock!(style=:update) click to toggle source

Refresh this record using :update lock style (by default, or the specified style when given), unless this is a new record. Returns self. This can be used to make sure no other process can modify the record during the transaction containing this call. Using this method only makes sense inside transactions.

If style is a string, it will be used directly. You should never pass a string to this method that is derived from user input, as that can lead to SQL injection.

A symbol may be used if the adapter supports that lock style.

a = Artist[1]
Artist.db.transaction do
  a.lock!
  a.update(name: 'A')
end

a = Artist[2]
Artist.db.transaction do
  a.lock!(:no_key_update)
  a.update(name: 'B')
end

     # File lib/sequel/model/base.rb
1471 def lock!(style=:update)
1472   _refresh(this.lock_style(style)) unless new?
1473   self
1474 end

marshallable!() click to toggle source

Remove elements of the model object that make marshalling fail. Returns self.

a = Artist[1]
a.marshallable!
Marshal.dump(a)

     # File lib/sequel/model/base.rb
1481 def marshallable!
1482   @this = nil
1483   self
1484 end

modified!(column=nil) click to toggle source

Explicitly mark the object as modified, so save_changes/update will run callbacks even if no columns have changed.

a = Artist[1]
a.save_changes # No callbacks run, as no changes
a.modified!
a.save_changes # Callbacks run, even though no changes made

If a column is given, specifically marked that column as modified, so that save_changes/update will include that column in the update. This should be used if you plan on mutating the column value instead of assigning a new column value:

a.modified!(:name)
a.name.gsub!(/[aeou]/, 'i')

     # File lib/sequel/model/base.rb
1501 def modified!(column=nil)
1502   _add_changed_column(column) if column
1503   @modified = true
1504 end

modified?(column=nil) click to toggle source

Whether this object has been modified since last saved, used by save_changes to determine whether changes should be saved. New values are always considered modified.

a = Artist[1]
a.modified? # => false
a.set(name: 'Jim')
a.modified? # => true

If a column is given, specifically check if the given column has been modified:

a.modified?(:num_albums) # => false
a.num_albums = 10
a.modified?(:num_albums) # => true

     # File lib/sequel/model/base.rb
1521 def modified?(column=nil)
1522   if column
1523     changed_columns.include?(column)
1524   else
1525     @modified || !changed_columns.empty?
1526   end
1527 end

new?() click to toggle source

Returns true if the current instance represents a new record.

Artist.new.new? # => true
Artist[1].new? # => false

     # File lib/sequel/model/base.rb
1533 def new?
1534   @new || false
1535 end

pk() click to toggle source

Returns the primary key value identifying the model instance. Raises an Error if this model does not have a primary key. If the model has a composite primary key, returns an array of values.

Artist[1].pk # => 1
Artist[[1, 2]].pk # => [1, 2]

     # File lib/sequel/model/base.rb
1543 def pk
1544   raise(Error, "No primary key is associated with this model") unless key = primary_key
1545   if key.is_a?(Array)
1546     vals = @values
1547     key.map{|k| vals[k]}
1548   else
1549     @values[key]
1550   end
1551 end

pk_equal?(obj)

If the receiver has a primary key value, returns true if the objects have the same class and primary key value. If the receiver's primary key value is nil or is an array containing nil, returns false.

Artist[1].pk_equal?(Artist[1]) # => true
Artist.new.pk_equal?(Artist.new) # => false
Artist[1].set(name: 'Bob').pk_equal?(Artist[1]) # => true

Alias for: ===

pk_hash() click to toggle source

Returns a hash mapping the receivers primary key column(s) to their values.

Artist[1].pk_hash # => {:id=>1}
Artist[[1, 2]].pk_hash # => {:id1=>1, :id2=>2}

     # File lib/sequel/model/base.rb
1557 def pk_hash
1558   model.primary_key_hash(pk)
1559 end

qualified_pk_hash(qualifier=model.table_name) click to toggle source

Returns a hash mapping the receivers qualified primary key column(s) to their values.

Artist[1].qualified_pk_hash
# => {Sequel[:artists][:id]=>1}
Artist[[1, 2]].qualified_pk_hash
# => {Sequel[:artists][:id1]=>1, Sequel[:artists][:id2]=>2}

     # File lib/sequel/model/base.rb
1567 def qualified_pk_hash(qualifier=model.table_name)
1568   model.qualified_primary_key_hash(pk, qualifier)
1569 end

refresh() click to toggle source

Reloads attributes from database and returns self. Also clears all changed_columns information. Raises an Error if the record no longer exists in the database.

a = Artist[1]
a.name = 'Jim'
a.refresh
a.name # => 'Bob'

     # File lib/sequel/model/base.rb
1579 def refresh
1580   raise Sequel::Error, "can't refresh frozen object" if frozen?
1581   _refresh(this)
1582   self
1583 end

reload() click to toggle source

Alias of refresh, but not aliased directly to make overriding in a plugin easier.

     # File lib/sequel/model/base.rb
1586 def reload
1587   refresh
1588 end

remove_key!(key) click to toggle source

Remove a key from the instances values, and return the value of the key.

a = Album[1]
a.values
# => {id: 1, artist_id: 2}
a.remove_key!(:artist_id)
# => 2
a.values
# => {id: 1}

     # File lib/sequel/model/base.rb
1600 def remove_key!(key)
1601   @values.delete(key)
1602 end

save(opts=OPTS) click to toggle source

Creates or updates the record, after making sure the record is valid and before hooks execute successfully. Fails if:

the record is not valid, or
before_save calls cancel_action, or
the record is new and before_create calls cancel_action, or
the record is not new and before_update calls cancel_action.

If save fails and either raise_on_save_failure or the :raise_on_failure option is true, it raises ValidationFailed or HookFailed. Otherwise it returns nil.

If it succeeds, it returns self.

Takes the following options:

:changed: save all changed columns, instead of all columns or the columns given
:columns: array of specific columns that should be saved.
:raise_on_failure: set to true or false to override the current raise_on_save_failure setting
:server: set the server/shard on the object before saving, and use that server/shard in any transaction.
:transaction: set to true or false to override the current use_transactions setting
:validate: set to false to skip validation

     # File lib/sequel/model/base.rb
1629 def save(opts=OPTS)
1630   raise Sequel::Error, "can't save frozen object" if frozen?
1631   set_server(opts[:server]) if opts[:server] 
1632   unless _save_valid?(opts)
1633     raise(validation_failed_error) if raise_on_failure?(opts)
1634     return
1635   end
1636   checked_save_failure(opts){checked_transaction(opts){_save(opts)}}
1637 end

save_changes(opts=OPTS) click to toggle source

Saves only changed columns if the object has been modified. If the object has not been modified, returns nil. If unable to save, returns false unless raise_on_save_failure is true.

a = Artist[1]
a.save_changes # => nil
a.name = 'Jim'
a.save_changes # UPDATE artists SET name = 'Bob' WHERE (id = 1)
# => #<Artist {:id=>1, :name=>'Jim', ...}

     # File lib/sequel/model/base.rb
1648 def save_changes(opts=OPTS)
1649   save(Hash[opts].merge!(:changed=>true)) || false if modified? 
1650 end

set(hash) click to toggle source

Updates the instance with the supplied values with support for virtual attributes, raising an exception if a value is used that doesn't have a setter method (or ignoring it if strict_param_setting = false). Does not save the record.

artist.set(name: 'Jim')
artist.name # => 'Jim'

     # File lib/sequel/model/base.rb
1659 def set(hash)
1660   set_restricted(hash, :default)
1661 end

set_fields(hash, fields, opts=nil) click to toggle source

For each of the fields in the given array fields, call the setter method with the value of that hash entry for the field. Returns self.

You can provide an options hash, with the following options currently respected:

:missing: Can be set to :skip to skip missing entries or :raise to raise an Error for missing entries. The default behavior is not to check for missing entries, in which case the default value is used. To be friendly with most web frameworks, the missing check will also check for the string version of the argument in the hash if given a symbol.

Examples:

artist.set_fields({name: 'Jim'}, [:name])
artist.name # => 'Jim'

artist.set_fields({hometown: 'LA'}, [:name])
artist.name # => nil
artist.hometown # => 'Sac'

artist.name # => 'Jim'
artist.set_fields({}, [:name], missing: :skip)
artist.name # => 'Jim'

artist.name # => 'Jim'
artist.set_fields({}, [:name], missing: :raise)
# Sequel::Error raised

     # File lib/sequel/model/base.rb
1689 def set_fields(hash, fields, opts=nil)
1690   opts = if opts
1691     model.default_set_fields_options.merge(opts)
1692   else
1693     model.default_set_fields_options
1694   end
1695 
1696   case missing = opts[:missing]
1697   when :skip, :raise
1698     do_raise = true if missing == :raise
1699     fields.each do |f|
1700       if hash.has_key?(f) 
1701         set_column_value("#{f}=", hash[f])
1702       elsif f.is_a?(Symbol) && hash.has_key?(sf = f.to_s)
1703         set_column_value("#{sf}=", hash[sf])
1704       elsif do_raise
1705         raise(Sequel::Error, "missing field in hash: #{f.inspect} not in #{hash.inspect}")
1706       end
1707     end
1708   else
1709     fields.each{|f| set_column_value("#{f}=", hash[f])}
1710   end
1711   self
1712 end

set_server(s) click to toggle source

Set the shard that this object is tied to. Returns self.

     # File lib/sequel/model/base.rb
1715 def set_server(s)
1716   @server = s
1717   @this = @this.server(s) if @this
1718   self
1719 end

singleton_method_added(meth) click to toggle source

Clear the setter_methods cache when a method is added

Calls superclass method

     # File lib/sequel/model/base.rb
1722 def singleton_method_added(meth)
1723   @singleton_setter_added = true if meth.to_s.end_with?('=')
1724   super
1725 end

skip_validation_on_next_save!() click to toggle source

Skip all validation of the object on the next call to save, including the running of validation hooks. This is designed for and should only be used in cases where valid? is called before saving and the validate: false option cannot be passed to save.

     # File lib/sequel/model/base.rb
1732 def skip_validation_on_next_save!
1733   @skip_validation_on_next_save = true
1734 end

this() click to toggle source

Returns naked dataset that should return only the row related to this instance.

Artist[1].this
# SELECT * FROM artists WHERE (id = 1) LIMIT 1

     # File lib/sequel/model/base.rb
1740 def this
1741   return @this if @this
1742   raise Error, "No dataset for model #{model}" unless ds = model.instance_dataset
1743   @this = use_server(ds.where(pk_hash))
1744 end

update(hash) click to toggle source

Runs set with the passed hash and then runs save_changes.

artist.update(name: 'Jim') # UPDATE artists SET name = 'Jim' WHERE (id = 1)

     # File lib/sequel/model/base.rb
1749 def update(hash)
1750   update_restricted(hash, :default)
1751 end

update_fields(hash, fields, opts=nil) click to toggle source

Update the instance's values by calling set_fields with the arguments, then calls save_changes.

artist.update_fields({name: 'Jim'}, [:name])
# UPDATE artists SET name = 'Jim' WHERE (id = 1)

artist.update_fields({hometown: 'LA'}, [:name])
# UPDATE artists SET name = NULL WHERE (id = 1)

     # File lib/sequel/model/base.rb
1761 def update_fields(hash, fields, opts=nil)
1762   set_fields(hash, fields, opts)
1763   save_changes
1764 end

valid?(opts = OPTS) click to toggle source

Validates the object and returns true if no errors are reported.

artist.set(name: 'Valid').valid? # => true
artist.set(name: 'Invalid').valid? # => false
artist.errors.full_messages # => ['name cannot be Invalid']

     # File lib/sequel/model/base.rb
1780 def valid?(opts = OPTS)
1781   _valid?(opts)
1782 rescue HookFailed
1783   false
1784 end

validate() click to toggle source

Validates the object. If the object is invalid, errors should be added to the errors attribute. By default, does nothing, as all models are valid by default. See the “Model Validations” guide. for details about validation. Should not be called directly by user code, call valid? instead to check if an object is valid.

     # File lib/sequel/model/base.rb
1772 def validate
1773 end

Private Instance Methods

_add_changed_column(column) click to toggle source

Add a column as a changed column.

     # File lib/sequel/model/base.rb
1789 def _add_changed_column(column)
1790   cc = _changed_columns
1791   cc << column unless cc.include?(column)
1792 end

_changed_columns() click to toggle source

Internal changed_columns method that just returns stored array.

     # File lib/sequel/model/base.rb
1795 def _changed_columns
1796   @changed_columns ||= []
1797 end

_clear_changed_columns(_reason) click to toggle source

Clear the changed columns. Reason is the reason for clearing the columns, and should be one of: :initialize, :refresh, :create or :update.

     # File lib/sequel/model/base.rb
1802 def _clear_changed_columns(_reason)
1803   _changed_columns.clear
1804 end

_delete() click to toggle source

Do the deletion of the object's dataset, and check that the row was actually deleted.

     # File lib/sequel/model/base.rb
1808 def _delete
1809   n = _delete_without_checking
1810   raise(NoExistingObject, "Attempt to delete object did not result in a single row modification (Rows Deleted: #{n}, SQL: #{_delete_dataset.delete_sql})") if require_modification && n != 1
1811   n
1812 end

_delete_dataset() click to toggle source

The dataset to use when deleting the object. The same as the object's dataset by default.

     # File lib/sequel/model/base.rb
1816 def _delete_dataset
1817   this
1818 end

_delete_without_checking() click to toggle source

Actually do the deletion of the object's dataset. Return the number of rows modified.

     # File lib/sequel/model/base.rb
1822 def _delete_without_checking
1823   if sql = (m = model).fast_instance_delete_sql
1824     sql = sql.dup
1825     ds = use_server(m.dataset)
1826     ds.literal_append(sql, pk)
1827     ds.with_sql_delete(sql)
1828   else
1829     _delete_dataset.delete 
1830   end
1831 end

_destroy(opts) click to toggle source

Internal destroy method, separted from destroy to allow running inside a transaction

     # File lib/sequel/model/base.rb
1835 def _destroy(opts)
1836   called = false
1837   around_destroy do
1838     called = true
1839     before_destroy
1840     _destroy_delete
1841     after_destroy
1842   end
1843   raise_hook_failure(:around_destroy) unless called
1844   self
1845 end

_destroy_delete() click to toggle source

Internal delete method to call when destroying an object, separated from delete to allow you to override destroy's version without affecting delete.

     # File lib/sequel/model/base.rb
1850 def _destroy_delete
1851   delete
1852 end

_insert() click to toggle source

Insert the record into the database, returning the primary key if the record should be refreshed from the database.

     # File lib/sequel/model/base.rb
1856 def _insert
1857   ds = _insert_dataset
1858   if _use_insert_select?(ds) && !(h = _insert_select_raw(ds)).nil?
1859     _save_set_values(h) if h
1860     nil
1861   else
1862     iid = _insert_raw(ds)
1863     # if we have a regular primary key and it's not set in @values,
1864     # we assume it's the last inserted id
1865     if (pk = autoincrementing_primary_key) && pk.is_a?(Symbol) && !(vals = @values)[pk]
1866       vals[pk] = iid
1867     end
1868     pk
1869   end
1870 end

_insert_dataset() click to toggle source

The dataset to use when inserting a new object. The same as the model's dataset by default.

     # File lib/sequel/model/base.rb
1874 def _insert_dataset
1875   use_server(model.instance_dataset)
1876 end

_insert_raw(ds) click to toggle source

Insert into the given dataset and return the primary key created (if any).

     # File lib/sequel/model/base.rb
1879 def _insert_raw(ds)
1880   ds.insert(_insert_values)
1881 end

_insert_select_raw(ds) click to toggle source

Insert into the given dataset and return the hash of column values.

     # File lib/sequel/model/base.rb
1884 def _insert_select_raw(ds)
1885   ds.insert_select(_insert_values)
1886 end

_refresh(dataset) click to toggle source

Refresh using a particular dataset, used inside save to make sure the same server is used for reading newly inserted values from the database

     # File lib/sequel/model/base.rb
1894 def _refresh(dataset)
1895   _refresh_set_values(_refresh_get(dataset) || raise(NoExistingObject, "Record not found"))
1896   _clear_changed_columns(:refresh)
1897 end

_refresh_get(dataset) click to toggle source

Get the row of column data from the database.

     # File lib/sequel/model/base.rb
1900 def _refresh_get(dataset)
1901   if (sql = model.fast_pk_lookup_sql) && !dataset.opts[:lock]
1902     sql = sql.dup
1903     ds = use_server(dataset)
1904     ds.literal_append(sql, pk)
1905     ds.with_sql_first(sql)
1906   else
1907     dataset.first
1908   end
1909 end

_refresh_set_values(h) click to toggle source

Set the values to the given hash after refreshing.

     # File lib/sequel/model/base.rb
1912 def _refresh_set_values(h)
1913   @values = h
1914 end

_save(opts) click to toggle source

Internal version of save, split from save to allow running inside it's own transaction.

     # File lib/sequel/model/base.rb
1918 def _save(opts)
1919   pk = nil
1920   called_save = false
1921   called_cu = false
1922   around_save do
1923     called_save = true
1924     before_save
1925 
1926     if new?
1927       around_create do
1928         called_cu = true
1929         before_create
1930         pk = _insert
1931         @this = nil
1932         @new = false
1933         @modified = false
1934         pk ? _save_refresh : _clear_changed_columns(:create)
1935         after_create
1936         true
1937       end
1938       raise_hook_failure(:around_create) unless called_cu
1939     else
1940       around_update do
1941         called_cu = true
1942         before_update
1943         columns = opts[:columns]
1944         if columns.nil?
1945           columns_updated = if opts[:changed]
1946             _save_update_changed_colums_hash
1947           else
1948             _save_update_all_columns_hash
1949           end
1950           _clear_changed_columns(:update)
1951         else # update only the specified columns
1952           columns = Array(columns)
1953           columns_updated = @values.reject{|k, v| !columns.include?(k)}
1954           _changed_columns.reject!{|c| columns.include?(c)}
1955         end
1956         _update_columns(columns_updated)
1957         @this = nil
1958         @modified = false
1959         after_update
1960         true
1961       end
1962       raise_hook_failure(:around_update) unless called_cu
1963     end
1964     after_save
1965     true
1966   end
1967   raise_hook_failure(:around_save) unless called_save
1968   self
1969 end

_save_refresh() click to toggle source

Refresh the object after saving it, used to get default values of all columns. Separated from _save so it can be overridden to avoid the refresh.

     # File lib/sequel/model/base.rb
1974 def _save_refresh
1975   _save_set_values(_refresh_get(this.server?(:default)) || raise(NoExistingObject, "Record not found"))
1976   _clear_changed_columns(:create)
1977 end

_save_set_values(h) click to toggle source

Set values to the provided hash. Called after a create, to set the full values from the database in the model instance.

     # File lib/sequel/model/base.rb
1981 def _save_set_values(h)
1982   @values = h
1983 end

_save_update_all_columns_hash() click to toggle source

Return a hash of values used when saving all columns of an existing object (i.e. not passing specific columns to save or using update/save_changes). Defaults to all of the object's values except unmodified primary key columns, as some databases don't like you setting primary key values even to their existing values.

     # File lib/sequel/model/base.rb
1991 def _save_update_all_columns_hash
1992   v = Hash[@values]
1993   cc = changed_columns
1994   Array(primary_key).each{|x| v.delete(x) unless cc.include?(x)}
1995   v
1996 end

_save_update_changed_colums_hash() click to toggle source

Return a hash of values used when saving changed columns of an existing object. Defaults to all of the objects current values that are recorded as modified.

     # File lib/sequel/model/base.rb
2001 def _save_update_changed_colums_hash
2002   cc = changed_columns
2003   @values.reject{|k,v| !cc.include?(k)}
2004 end

_save_valid?(opts) click to toggle source

Validate the object if validating on save. Skips validation completely (including validation hooks) if skip_validation_on_save! has been called on the object, resetting the flag so that future saves will validate.

     # File lib/sequel/model/base.rb
2010 def _save_valid?(opts)
2011   if @skip_validation_on_next_save
2012     @skip_validation_on_next_save = false
2013     return true
2014   end
2015 
2016   checked_save_failure(opts){_valid?(opts)}
2017 end

_update(columns) click to toggle source

Update this instance's dataset with the supplied column hash, checking that only a single row was modified.

     # File lib/sequel/model/base.rb
2028 def _update(columns)
2029   n = _update_without_checking(columns)
2030   raise(NoExistingObject, "Attempt to update object did not result in a single row modification (SQL: #{_update_dataset.update_sql(columns)})") if require_modification && n != 1
2031   n
2032 end

_update_columns(columns) click to toggle source

Call _update with the given columns, if any are present. Plugins can override this method in order to update with additional columns, even when the column hash is initially empty.

     # File lib/sequel/model/base.rb
2022 def _update_columns(columns)
2023   _update(columns) unless columns.empty?
2024 end

_update_dataset() click to toggle source

The dataset to use when updating an object. The same as the object's dataset by default.

     # File lib/sequel/model/base.rb
2036 def _update_dataset
2037   this
2038 end

_update_without_checking(columns) click to toggle source

Update this instances dataset with the supplied column hash.

     # File lib/sequel/model/base.rb
2041 def _update_without_checking(columns)
2042   _update_dataset.update(columns)
2043 end

_use_insert_select?(ds) click to toggle source

Whether to use insert_select when inserting a new row.

     # File lib/sequel/model/base.rb
2046 def _use_insert_select?(ds)
2047   (!ds.opts[:select] || ds.opts[:returning]) && ds.supports_insert_select? 
2048 end

_valid?(opts) click to toggle source

Internal validation method, running validation hooks.

     # File lib/sequel/model/base.rb
2051 def _valid?(opts)
2052   return errors.empty? if frozen?
2053   errors.clear
2054   called = false
2055   skip_validate = opts[:validate] == false
2056   around_validation do
2057     called = true
2058     before_validation
2059     validate unless skip_validate
2060     after_validation
2061   end
2062 
2063   return true if skip_validate
2064 
2065   if called
2066     errors.empty?
2067   else
2068     raise_hook_failure(:around_validation)
2069   end
2070 end

change_column_value(column, value) click to toggle source

Change the value of the column to given value, recording the change.

     # File lib/sequel/model/base.rb
2094 def change_column_value(column, value)
2095   _add_changed_column(column)
2096   @values[column] = value
2097 end

checked_save_failure(opts) { || ... } click to toggle source

If not raising on failure, check for HookFailed being raised by yielding and swallow it.

     # File lib/sequel/model/base.rb
2074 def checked_save_failure(opts)
2075   if raise_on_failure?(opts)
2076     yield
2077   else
2078     begin
2079       yield
2080     rescue HookFailed 
2081       nil
2082     end
2083   end
2084 end

checked_transaction(opts=OPTS, &block) click to toggle source

If transactions should be used, wrap the yield in a transaction block.

     # File lib/sequel/model/base.rb
2087 def checked_transaction(opts=OPTS, &block)
2088   h = {:server=>this_server}.merge!(opts)
2089   h[:skip_transaction] = true unless use_transaction?(opts)
2090   db.transaction(h, &block)
2091 end

errors_class() click to toggle source

Default error class used for errors.

     # File lib/sequel/model/base.rb
2100 def errors_class
2101   Errors
2102 end

hook_failed_error(msg) click to toggle source

A HookFailed exception for the given message tied to the current instance.

     # File lib/sequel/model/base.rb
2105 def hook_failed_error(msg)
2106   HookFailed.new(msg, self)
2107 end

initialize_clone(other) click to toggle source

Clone constructor – freeze internal data structures if the original's are frozen.

Calls superclass method

     # File lib/sequel/model/base.rb
2111 def initialize_clone(other)
2112   super
2113   freeze if other.frozen?
2114   self
2115 end

initialize_copy(other) click to toggle source

Copy constructor – Duplicate internal data structures.

Calls superclass method

     # File lib/sequel/model/base.rb
2118 def initialize_copy(other)
2119   super
2120   @values = Hash[@values]
2121   @changed_columns = @changed_columns.dup if @changed_columns
2122   @errors = @errors.dup if @errors
2123   self
2124 end

initialize_set(h) click to toggle source

Set the columns with the given hash. By default, the same as set, but exists so it can be overridden. This is called only for new records, before changed_columns is cleared.

     # File lib/sequel/model/base.rb
2129 def initialize_set(h)
2130   set(h) unless h.empty?
2131 end

inspect_prefix() click to toggle source

Default inspect output for the inspect, by default, just showing the class.

     # File lib/sequel/model/base.rb
2134 def inspect_prefix
2135   model.name
2136 end

inspect_values() click to toggle source

Default inspect output for the values hash, overwrite to change what inspect displays.

     # File lib/sequel/model/base.rb
2139 def inspect_values
2140   @values.inspect
2141 end

raise_hook_failure(type=nil) click to toggle source

Raise an error appropriate to the hook type. May be swallowed by checked_save_failure depending on the raise_on_failure? setting.

     # File lib/sequel/model/base.rb
2153 def raise_hook_failure(type=nil)
2154   msg = case type
2155   when String
2156     type
2157   when Symbol
2158     "the #{type} hook failed"
2159   else
2160     "a hook failed"
2161   end
2162 
2163   raise hook_failed_error(msg)
2164 end

raise_on_failure?(opts) click to toggle source

Whether to raise or return false if this action fails. If the :raise_on_failure option is present in the hash, use that, otherwise, fallback to the object's raise_on_save_failure (if set), or class's default (if not).

     # File lib/sequel/model/base.rb
2147 def raise_on_failure?(opts)
2148   opts.fetch(:raise_on_failure, raise_on_save_failure)
2149 end

schema_type_class(column) click to toggle source

Get the ruby class or classes related to the given column's type.

     # File lib/sequel/model/base.rb
2167 def schema_type_class(column)
2168   if (sch = db_schema[column]) && (type = sch[:type])
2169     db.schema_type_class(type)
2170   end
2171 end

set_restricted(hash, type) click to toggle source

Call setter methods based on keys in hash, with the appropriate values. Restrict which methods can be called based on the provided type.

     # File lib/sequel/model/base.rb
2175 def set_restricted(hash, type)
2176   return self if hash.empty?
2177   meths = setter_methods(type)
2178   strict = strict_param_setting
2179   hash.each do |k,v|
2180     k = k.to_s
2181     m = "#{k}="
2182     if meths.include?(m)
2183       set_column_value(m, v)
2184     elsif strict
2185       # Avoid using respond_to? or creating symbols from user input
2186       if public_methods.map(&:to_s).include?(m)
2187         if Array(model.primary_key).map(&:to_s).member?(k) && model.restrict_primary_key?
2188           raise MassAssignmentRestriction.create("#{k} is a restricted primary key", self, k)
2189         else
2190           raise MassAssignmentRestriction.create("#{k} is a restricted column", self, k)
2191         end
2192       else
2193         raise MassAssignmentRestriction.create("method #{m} doesn't exist", self, k)
2194       end
2195     end
2196   end
2197   self
2198 end

setter_methods(type) click to toggle source

Returns all methods that can be used for attribute assignment (those that end with =), depending on the type:

:default: Use the default methods allowed in the model class.
:all: Allow setting all setters, except those specifically restricted (such as ==).
Array: Only allow setting of columns in the given array.

     # File lib/sequel/model/base.rb
2206 def setter_methods(type)
2207   if type == :default && !@singleton_setter_added
2208     return model.setter_methods
2209   end
2210 
2211   meths = methods.map(&:to_s).select{|l| l.end_with?('=')} - RESTRICTED_SETTER_METHODS
2212   meths -= Array(primary_key).map{|x| "#{x}="} if primary_key && model.restrict_primary_key?
2213   meths
2214 end

this_server() click to toggle source

The server/shard that the model object's dataset uses, or :default if the model object's dataset does not have an associated shard.

     # File lib/sequel/model/base.rb
2218 def this_server
2219   if (s = @server)
2220     s
2221   elsif (t = @this)
2222     t.opts[:server] || :default
2223   else
2224     model.dataset.opts[:server] || :default
2225   end
2226 end

typecast_value(column, value) click to toggle source

Typecast the value to the column's type if typecasting. Calls the database's typecast_value method, so database adapters can override/augment the handling for database specific column types.

     # File lib/sequel/model/base.rb
2231 def typecast_value(column, value)
2232   return value unless typecast_on_assignment && db_schema && (col_schema = db_schema[column])
2233   value = nil if '' == value and typecast_empty_string_to_nil and col_schema[:type] and ![:string, :blob].include?(col_schema[:type])
2234   raise(InvalidValue, "nil/NULL is not allowed for the #{column} column") if raise_on_typecast_failure && value.nil? && (col_schema[:allow_null] == false)
2235   begin
2236     model.db.typecast_value(col_schema[:type], value)
2237   rescue InvalidValue
2238     raise_on_typecast_failure ? raise : value
2239   end
2240 end

update_restricted(hash, type) click to toggle source

Set the columns, filtered by the only and except arrays.

     # File lib/sequel/model/base.rb
2243 def update_restricted(hash, type)
2244   set_restricted(hash, type)
2245   save_changes
2246 end

use_server(ds) click to toggle source

Set the given dataset to use the current object's shard.

     # File lib/sequel/model/base.rb
2249 def use_server(ds)
2250   @server ? ds.server(@server) : ds
2251 end

use_transaction?(opts = OPTS) click to toggle source

Whether to use a transaction for this action. If the :transaction option is present in the hash, use that, otherwise, fallback to the object's default (if set), or class's default (if not).

     # File lib/sequel/model/base.rb
2256 def use_transaction?(opts = OPTS)
2257   opts.fetch(:transaction, use_transactions)
2258 end

validation_failed_error() click to toggle source

An ValidationFailed exception instance to raise for this instance.

     # File lib/sequel/model/base.rb
2261 def validation_failed_error
2262   ValidationFailed.new(self)
2263 end