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
844 def can_have_associated_objects?(obj)
845   !self[:keys].any?{|k| obj.get_column_value(k).nil?}
846 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
849 def dataset_need_primary_key?
850   false
851 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
855 def default_key
856   :"#{self[:name]}_id"
857 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
861 def eager_graph_lazy_dataset?
862   self[:key].nil?
863 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
866 def eager_graph_limit_strategy(_)
867   nil
868 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
871 def eager_limit_strategy
872   nil
873 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
876 def filter_by_associations_limit_strategy
877   nil
878 end
finalize_settings() click to toggle source
    # File lib/sequel/model/associations.rb
888 def finalize_settings
889   FINALIZE_SETTINGS
890 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
893 def predicate_key
894   cached_fetch(:predicate_key){qualified_primary_key}
895 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
898 def primary_key
899  cached_fetch(:primary_key){associated_class.primary_key || raise(Error, "no primary key specified for #{associated_class.inspect}")}
900 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
910 def primary_key_method
911  cached_fetch(:primary_key_method){primary_key}
912 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
916 def primary_key_methods
917  cached_fetch(:primary_key_methods){Array(primary_key_method)}
918 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
903 def primary_keys
904  cached_fetch(:primary_keys){Array(primary_key)}
905 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
921 def qualified_primary_key
922   cached_fetch(:qualified_primary_key){self[:qualify] == false ? primary_key : qualify_assoc(primary_key)}
923 end
reciprocal_array?() click to toggle source

True only if the reciprocal is a one_to_many association.

    # File lib/sequel/model/associations.rb
926 def reciprocal_array?
927   !set_reciprocal_to_self?
928 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
932 def returns_array?
933   false
934 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
937 def set_reciprocal_to_self?
938   reciprocal
939   reciprocal_type == :one_to_one
940 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
946 def ambiguous_reciprocal_type?
947   true
948 end
filter_by_associations_conditions_associated_keys() click to toggle source
    # File lib/sequel/model/associations.rb
950 def filter_by_associations_conditions_associated_keys
951   qualify(associated_class.table_name, primary_keys)
952 end
filter_by_associations_conditions_key() click to toggle source
    # File lib/sequel/model/associations.rb
954 def filter_by_associations_conditions_key
955   qualify(self[:model].table_name, self[:key_column])
956 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
960 def limit_to_single_row?
961   super && self[:key]
962 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
970 def possible_reciprocal_types
971   [:one_to_many, :one_to_one]
972 end
predicate_key_methods() click to toggle source
    # File lib/sequel/model/associations.rb
964 def predicate_key_methods
965   self[:keys]
966 end
reciprocal_association?(assoc_reflect) click to toggle source

Whether the given association reflection is possible reciprocal

    # File lib/sequel/model/associations.rb
975 def reciprocal_association?(assoc_reflect)
976   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
977 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
982 def reciprocal_type
983   cached_fetch(:reciprocal_type) do
984     possible_recips = []
985 
986     associated_class.all_association_reflections.each do |assoc_reflect|
987       if reciprocal_association?(assoc_reflect)
988         possible_recips << assoc_reflect
989       end
990     end
991 
992     if possible_recips.length == 1
993       possible_recips.first[:type]
994     else
995       possible_reciprocal_types
996     end
997   end
998 end