associated_object_keys()
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can_have_associated_objects?(obj)
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many_to_one associations can only have associated objects if none of the
:keys options have a nil value.
def can_have_associated_objects?(obj)
!self[:keys].any?{|k| obj.send(k).nil?}
end
dataset_need_primary_key?()
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Whether the dataset needs a primary key to function, false for many_to_one
associations.
def dataset_need_primary_key?
false
end
default_key()
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Default foreign key name symbol for foreign key in current model's table
that points to the given association's table's primary key.
def default_key
:"#{self[:name]}_id"
end
eager_graph_lazy_dataset?()
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Whether to eagerly graph a lazy dataset, true for many_to_one associations
only if the key is nil.
def eager_graph_lazy_dataset?
self[:key].nil?
end
eager_graph_limit_strategy(_)
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many_to_one associations don't need an eager_graph limit strategy
def eager_graph_limit_strategy(_)
nil
end
eager_limit_strategy()
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many_to_one associations don't need an eager limit strategy
def eager_limit_strategy
nil
end
filter_by_associations_limit_strategy()
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many_to_one associations don't need a filter by associations limit strategy
def filter_by_associations_limit_strategy
nil
end
predicate_key()
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The expression to use on the left hand side of the IN lookup when eager
loading
def predicate_key
cached_fetch(:predicate_key){qualified_primary_key}
end
primary_key()
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The column(s) in the associated table that the key in the current table
references (either a symbol or an array).
def primary_key
cached_fetch(:primary_key){associated_class.primary_key || raise(Error, "no primary key specified for #{associated_class.inspect}")}
end
primary_key_method()
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The method symbol or array of method symbols to call on the associated
object to get the value to use for the foreign keys.
def primary_key_method
cached_fetch(:primary_key_method){primary_key}
end
primary_key_methods()
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The array of method symbols to call on the associated object to get the
value to use for the foreign keys.
def primary_key_methods
cached_fetch(:primary_key_methods){Array(primary_key_method)}
end
primary_keys()
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The columns in the associated table that the key in the current table
references (always an array).
def primary_keys
cached_fetch(:primary_keys){Array(primary_key)}
end
qualified_primary_key()
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primary_key
qualified by the associated table
def qualified_primary_key
cached_fetch(:qualified_primary_key){self[:qualify] == false ? primary_key : qualify_assoc(primary_key)}
end
reciprocal_array?()
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True only if the reciprocal is a one_to_many association.
def reciprocal_array?
!set_reciprocal_to_self?
end
returns_array?()
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Whether this association returns an array of objects instead of a single
object, false for a many_to_one association.
def returns_array?
false
end
set_reciprocal_to_self?()
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True only if the reciprocal is a one_to_one association.
def set_reciprocal_to_self?
reciprocal
reciprocal_type == :one_to_one
end