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
855 def can_have_associated_objects?(obj)
856   !self[:keys].any?{|k| obj.get_column_value(k).nil?}
857 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
860 def dataset_need_primary_key?
861   false
862 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
866 def default_key
867   :"#{self[:name]}_id"
868 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
872 def eager_graph_lazy_dataset?
873   self[:key].nil?
874 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
877 def eager_graph_limit_strategy(_)
878   nil
879 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
882 def eager_limit_strategy
883   nil
884 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
887 def filter_by_associations_limit_strategy
888   nil
889 end
finalize_settings() click to toggle source
    # File lib/sequel/model/associations.rb
899 def finalize_settings
900   FINALIZE_SETTINGS
901 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
904 def predicate_key
905   cached_fetch(:predicate_key){qualified_primary_key}
906 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
909 def primary_key
910  cached_fetch(:primary_key){associated_class.primary_key || raise(Error, "no primary key specified for #{associated_class.inspect}")}
911 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
921 def primary_key_method
922  cached_fetch(:primary_key_method){primary_key}
923 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
927 def primary_key_methods
928  cached_fetch(:primary_key_methods){Array(primary_key_method)}
929 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
914 def primary_keys
915  cached_fetch(:primary_keys){Array(primary_key)}
916 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
932 def qualified_primary_key
933   cached_fetch(:qualified_primary_key){self[:qualify] == false ? primary_key : qualify_assoc(primary_key)}
934 end
reciprocal_array?() click to toggle source

True only if the reciprocal is a one_to_many association.

    # File lib/sequel/model/associations.rb
937 def reciprocal_array?
938   !set_reciprocal_to_self?
939 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
943 def returns_array?
944   false
945 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
948 def set_reciprocal_to_self?
949   reciprocal
950   reciprocal_type == :one_to_one
951 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
957 def ambiguous_reciprocal_type?
958   true
959 end
filter_by_associations_conditions_associated_keys() click to toggle source
    # File lib/sequel/model/associations.rb
961 def filter_by_associations_conditions_associated_keys
962   qualify(associated_class.table_name, primary_keys)
963 end
filter_by_associations_conditions_key() click to toggle source
    # File lib/sequel/model/associations.rb
965 def filter_by_associations_conditions_key
966   qualify(self[:model].table_name, self[:key_column])
967 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
971 def limit_to_single_row?
972   super && self[:key]
973 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
981 def possible_reciprocal_types
982   [:one_to_many, :one_to_one]
983 end
predicate_key_methods() click to toggle source
    # File lib/sequel/model/associations.rb
975 def predicate_key_methods
976   self[:keys]
977 end
reciprocal_association?(assoc_reflect) click to toggle source

Whether the given association reflection is possible reciprocal

    # File lib/sequel/model/associations.rb
986 def reciprocal_association?(assoc_reflect)
987   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
988 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
 993 def reciprocal_type
 994   cached_fetch(:reciprocal_type) do
 995     possible_recips = []
 996 
 997     associated_class.all_association_reflections.each do |assoc_reflect|
 998       if reciprocal_association?(assoc_reflect)
 999         possible_recips << assoc_reflect
1000       end
1001     end
1002 
1003     if possible_recips.length == 1
1004       possible_recips.first[:type]
1005     else
1006       possible_reciprocal_types
1007     end
1008   end
1009 end