class Sequel::Model::Associations::OneToManyAssociationReflection

Constants

FINALIZE_SETTINGS

Public Instance Methods

apply_eager_graph_limit_strategy(strategy, ds) click to toggle source

Support a correlated subquery limit strategy when using eager_graph.

     # File lib/sequel/model/associations.rb
 995 def apply_eager_graph_limit_strategy(strategy, ds)
 996   case strategy
 997   when :correlated_subquery
 998     apply_correlated_subquery_limit_strategy(ds)
 999   else
1000     super
1001   end
1002 end
associated_object_keys() click to toggle source

The keys in the associated model's table related to this association

     # File lib/sequel/model/associations.rb
1005 def associated_object_keys
1006   self[:keys]
1007 end
can_have_associated_objects?(obj) click to toggle source

one_to_many associations can only have associated objects if none of the :keys options have a nil value.

     # File lib/sequel/model/associations.rb
1011 def can_have_associated_objects?(obj)
1012   !self[:primary_keys].any?{|k| obj.get_column_value(k).nil?}
1013 end
cloneable?(ref) click to toggle source

one_to_many and one_to_one associations can be clones

     # File lib/sequel/model/associations.rb
1016 def cloneable?(ref)
1017   ref[:type] == :one_to_many || ref[:type] == :one_to_one
1018 end
default_key() click to toggle source

Default foreign key name symbol for key in associated table that points to current table's primary key.

     # File lib/sequel/model/associations.rb
1022 def default_key
1023   :"#{underscore(demodulize(self[:model].name))}_id"
1024 end
finalize_settings() click to toggle source
     # File lib/sequel/model/associations.rb
1029 def finalize_settings
1030   FINALIZE_SETTINGS
1031 end
handle_silent_modification_failure?() click to toggle source

Handle silent failure of add/remove methods if raise_on_save_failure is false.

     # File lib/sequel/model/associations.rb
1034 def handle_silent_modification_failure?
1035   self[:raise_on_save_failure] == false
1036 end
predicate_key() click to toggle source

The hash key to use for the eager loading predicate (left side of IN (1, 2, 3))

     # File lib/sequel/model/associations.rb
1039 def predicate_key
1040   cached_fetch(:predicate_key){qualify_assoc(self[:key])}
1041 end
Also aliased as: qualified_key
primary_key() click to toggle source

The column in the current table that the key in the associated table references.

     # File lib/sequel/model/associations.rb
1045 def primary_key
1046   self[:primary_key]
1047 end
qualified_key()
Alias for: predicate_key
qualified_primary_key() click to toggle source

primary_key qualified by the current table

     # File lib/sequel/model/associations.rb
1050 def qualified_primary_key
1051   cached_fetch(:qualified_primary_key){qualify_cur(primary_key)}
1052 end
reciprocal_array?() click to toggle source

Whether the reciprocal of this association returns an array of objects instead of a single object, false for a one_to_many association.

     # File lib/sequel/model/associations.rb
1056 def reciprocal_array?
1057   false
1058 end
remove_before_destroy?() click to toggle source

Destroying one_to_many associated objects automatically deletes the foreign key.

     # File lib/sequel/model/associations.rb
1061 def remove_before_destroy?
1062   false
1063 end
remove_should_check_existing?() click to toggle source

The one_to_many association needs to check that an object to be removed already is associated.

     # File lib/sequel/model/associations.rb
1066 def remove_should_check_existing?
1067   true
1068 end
set_reciprocal_to_self?() click to toggle source

One to many associations set the reciprocal to self when loading associated records.

     # File lib/sequel/model/associations.rb
1071 def set_reciprocal_to_self?
1072   true
1073 end

Private Instance Methods

apply_correlated_subquery_limit_strategy(ds) click to toggle source

Use a correlated subquery to limit the dataset. Note that this will not work correctly if the associated dataset uses qualified identifers in the WHERE clause, as they would reference the containing query instead of the subquery.

     # File lib/sequel/model/associations.rb
1080 def apply_correlated_subquery_limit_strategy(ds)
1081   table = ds.first_source_table
1082   table_alias = ds.first_source_alias
1083   primary_key = associated_class.primary_key
1084   key = self[:key]
1085   cs_alias = :t1
1086   cs = associated_dataset.
1087     from(Sequel.as(table, :t1)).
1088     select(*qualify(cs_alias, primary_key)).
1089     where(Array(qualify(cs_alias, key)).zip(Array(qualify(table_alias, key)))).
1090     limit(*limit_and_offset)
1091   ds.where(qualify(table_alias, primary_key)=>cs)
1092 end
apply_filter_by_associations_limit_strategy(ds) click to toggle source

Support correlated subquery strategy when filtering by limited associations.

     # File lib/sequel/model/associations.rb
1095 def apply_filter_by_associations_limit_strategy(ds)
1096   case filter_by_associations_limit_strategy
1097   when :correlated_subquery
1098     apply_correlated_subquery_limit_strategy(ds)
1099   else
1100     super
1101   end
1102 end
filter_by_associations_conditions_associated_keys() click to toggle source
     # File lib/sequel/model/associations.rb
1104 def filter_by_associations_conditions_associated_keys
1105   qualify(associated_class.table_name, self[:keys])
1106 end
filter_by_associations_conditions_key() click to toggle source
     # File lib/sequel/model/associations.rb
1108 def filter_by_associations_conditions_key
1109   qualify(self[:model].table_name, self[:primary_key_column])
1110 end
filter_by_associations_limit_alias_key() click to toggle source
     # File lib/sequel/model/associations.rb
1112 def filter_by_associations_limit_alias_key
1113   Array(filter_by_associations_limit_key)
1114 end
filter_by_associations_limit_aliases() click to toggle source
     # File lib/sequel/model/associations.rb
1116 def filter_by_associations_limit_aliases
1117   filter_by_associations_limit_alias_key.map(&:column)
1118 end
filter_by_associations_limit_key() click to toggle source
     # File lib/sequel/model/associations.rb
1120 def filter_by_associations_limit_key
1121   qualify(associated_class.table_name, associated_class.primary_key)
1122 end
predicate_key_methods() click to toggle source
     # File lib/sequel/model/associations.rb
1124 def predicate_key_methods
1125   self[:primary_keys]
1126 end
reciprocal_association?(assoc_reflect) click to toggle source
     # File lib/sequel/model/associations.rb
1128 def reciprocal_association?(assoc_reflect)
1129   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
1130 end
reciprocal_type() click to toggle source

The reciprocal type of a one_to_many association is a many_to_one association.

     # File lib/sequel/model/associations.rb
1133 def reciprocal_type
1134   :many_to_one
1135 end
true_eager_graph_limit_strategy() click to toggle source

Support automatic use of correlated subqueries if :ruby option is best available option, the database supports them, and either the associated class has a non-composite primary key or the database supports multiple columns in IN.

     # File lib/sequel/model/associations.rb
1140 def true_eager_graph_limit_strategy
1141   r = super
1142   ds = associated_dataset
1143   if r == :ruby && ds.supports_limits_in_correlated_subqueries? && (Array(associated_class.primary_key).length == 1 || ds.supports_multiple_column_in?) && (!offset || ds.supports_offsets_in_correlated_subqueries?)
1144     :correlated_subquery
1145   else
1146     r
1147   end
1148 end