class Sequel::Model::Associations::ManyToOneAssociationReflection

Constants

FINALIZE_SETTINGS

Public Instance Methods

associated_object_keys()
Alias for: primary_keys
can_have_associated_objects?(obj) click to toggle source

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

    # File lib/sequel/model/associations.rb
803 def can_have_associated_objects?(obj)
804   !self[:keys].any?{|k| obj.get_column_value(k).nil?}
805 end
dataset_need_primary_key?() click to toggle source

Whether the dataset needs a primary key to function, false for many_to_one associations.

    # File lib/sequel/model/associations.rb
808 def dataset_need_primary_key?
809   false
810 end
default_key() click to toggle source

Default foreign key name symbol for foreign key in current model's table that points to the given association's table's primary key.

    # File lib/sequel/model/associations.rb
814 def default_key
815   :"#{self[:name]}_id"
816 end
eager_graph_lazy_dataset?() click to toggle source

Whether to eagerly graph a lazy dataset, true for many_to_one associations only if the key is nil.

    # File lib/sequel/model/associations.rb
820 def eager_graph_lazy_dataset?
821   self[:key].nil?
822 end
eager_graph_limit_strategy(_) click to toggle source

many_to_one associations don't need an eager_graph limit strategy

    # File lib/sequel/model/associations.rb
825 def eager_graph_limit_strategy(_)
826   nil
827 end
eager_limit_strategy() click to toggle source

many_to_one associations don't need an eager limit strategy

    # File lib/sequel/model/associations.rb
830 def eager_limit_strategy
831   nil
832 end
filter_by_associations_limit_strategy() click to toggle source

many_to_one associations don't need a filter by associations limit strategy

    # File lib/sequel/model/associations.rb
835 def filter_by_associations_limit_strategy
836   nil
837 end
finalize_settings() click to toggle source
    # File lib/sequel/model/associations.rb
847 def finalize_settings
848   FINALIZE_SETTINGS
849 end
predicate_key() click to toggle source

The expression to use on the left hand side of the IN lookup when eager loading

    # File lib/sequel/model/associations.rb
852 def predicate_key
853   cached_fetch(:predicate_key){qualified_primary_key}
854 end
primary_key() click to toggle source

The column(s) in the associated table that the key in the current table references (either a symbol or an array).

    # File lib/sequel/model/associations.rb
857 def primary_key
858  cached_fetch(:primary_key){associated_class.primary_key || raise(Error, "no primary key specified for #{associated_class.inspect}")}
859 end
primary_key_method() click to toggle source

The method symbol or array of method symbols to call on the associated object to get the value to use for the foreign keys.

    # File lib/sequel/model/associations.rb
869 def primary_key_method
870  cached_fetch(:primary_key_method){primary_key}
871 end
primary_key_methods() click to toggle source

The array of method symbols to call on the associated object to get the value to use for the foreign keys.

    # File lib/sequel/model/associations.rb
875 def primary_key_methods
876  cached_fetch(:primary_key_methods){Array(primary_key_method)}
877 end
primary_keys() click to toggle source

The columns in the associated table that the key in the current table references (always an array).

    # File lib/sequel/model/associations.rb
862 def primary_keys
863  cached_fetch(:primary_keys){Array(primary_key)}
864 end
Also aliased as: associated_object_keys
qualified_primary_key() click to toggle source

primary_key qualified by the associated table

    # File lib/sequel/model/associations.rb
880 def qualified_primary_key
881   cached_fetch(:qualified_primary_key){self[:qualify] == false ? primary_key : qualify_assoc(primary_key)}
882 end
reciprocal_array?() click to toggle source

True only if the reciprocal is a one_to_many association.

    # File lib/sequel/model/associations.rb
885 def reciprocal_array?
886   !set_reciprocal_to_self?
887 end
returns_array?() click to toggle source

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

    # File lib/sequel/model/associations.rb
891 def returns_array?
892   false
893 end
set_reciprocal_to_self?() click to toggle source

True only if the reciprocal is a one_to_one association.

    # File lib/sequel/model/associations.rb
896 def set_reciprocal_to_self?
897   reciprocal
898   reciprocal_type == :one_to_one
899 end

Private Instance Methods

ambiguous_reciprocal_type?() click to toggle source

Reciprocals of many_to_one associations could be either one_to_many or one_to_one, and which is not known in advance.

    # File lib/sequel/model/associations.rb
905 def ambiguous_reciprocal_type?
906   true
907 end
filter_by_associations_conditions_associated_keys() click to toggle source
    # File lib/sequel/model/associations.rb
909 def filter_by_associations_conditions_associated_keys
910   qualify(associated_class.table_name, primary_keys)
911 end
filter_by_associations_conditions_key() click to toggle source
    # File lib/sequel/model/associations.rb
913 def filter_by_associations_conditions_key
914   qualify(self[:model].table_name, self[:key_column])
915 end
limit_to_single_row?() click to toggle source

many_to_one associations do not need to be limited to a single row if they explicitly do not have a key.

    # File lib/sequel/model/associations.rb
919 def limit_to_single_row?
920   super && self[:key]
921 end
possible_reciprocal_types() click to toggle source

The reciprocal type of a many_to_one association is either a one_to_many or a one_to_one association.

    # File lib/sequel/model/associations.rb
929 def possible_reciprocal_types
930   [:one_to_many, :one_to_one]
931 end
predicate_key_methods() click to toggle source
    # File lib/sequel/model/associations.rb
923 def predicate_key_methods
924   self[:keys]
925 end
reciprocal_association?(assoc_reflect) click to toggle source

Whether the given association reflection is possible reciprocal

    # File lib/sequel/model/associations.rb
934 def reciprocal_association?(assoc_reflect)
935   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
936 end
reciprocal_type() click to toggle source

The reciprocal type of a many_to_one association is either a one_to_many or a one_to_one association, look in the associated class to try to figure out which.

    # File lib/sequel/model/associations.rb
941 def reciprocal_type
942   cached_fetch(:reciprocal_type) do
943     possible_recips = []
944 
945     associated_class.all_association_reflections.each do |assoc_reflect|
946       if reciprocal_association?(assoc_reflect)
947         possible_recips << assoc_reflect
948       end
949     end
950 
951     if possible_recips.length == 1
952       possible_recips.first[:type]
953     else
954       possible_reciprocal_types
955     end
956   end
957 end