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
1016 def apply_eager_graph_limit_strategy(strategy, ds)
1017   case strategy
1018   when :correlated_subquery
1019     apply_correlated_subquery_limit_strategy(ds)
1020   else
1021     super
1022   end
1023 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
1026 def associated_object_keys
1027   self[:keys]
1028 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
1032 def can_have_associated_objects?(obj)
1033   !self[:primary_keys].any?{|k| obj.get_column_value(k).nil?}
1034 end
cloneable?(ref) click to toggle source

one_to_many and one_to_one associations can be clones

     # File lib/sequel/model/associations.rb
1037 def cloneable?(ref)
1038   ref[:type] == :one_to_many || ref[:type] == :one_to_one
1039 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
1043 def default_key
1044   :"#{underscore(demodulize(self[:model].name))}_id"
1045 end
finalize_settings() click to toggle source
     # File lib/sequel/model/associations.rb
1050 def finalize_settings
1051   FINALIZE_SETTINGS
1052 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
1055 def handle_silent_modification_failure?
1056   self[:raise_on_save_failure] == false
1057 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
1060 def predicate_key
1061   cached_fetch(:predicate_key){qualify_assoc(self[:key])}
1062 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
1066 def primary_key
1067   self[:primary_key]
1068 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
1071 def qualified_primary_key
1072   cached_fetch(:qualified_primary_key){qualify_cur(primary_key)}
1073 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
1077 def reciprocal_array?
1078   false
1079 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
1082 def remove_before_destroy?
1083   false
1084 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
1087 def remove_should_check_existing?
1088   true
1089 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
1092 def set_reciprocal_to_self?
1093   true
1094 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
1101 def apply_correlated_subquery_limit_strategy(ds)
1102   table = ds.first_source_table
1103   table_alias = ds.first_source_alias
1104   primary_key = associated_class.primary_key
1105   key = self[:key]
1106   cs_alias = :t1
1107   cs = associated_dataset.
1108     from(Sequel.as(table, :t1)).
1109     select(*qualify(cs_alias, primary_key)).
1110     where(Array(qualify(cs_alias, key)).zip(Array(qualify(table_alias, key)))).
1111     limit(*limit_and_offset)
1112   ds.where(qualify(table_alias, primary_key)=>cs)
1113 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
1116 def apply_filter_by_associations_limit_strategy(ds)
1117   case filter_by_associations_limit_strategy
1118   when :correlated_subquery
1119     apply_correlated_subquery_limit_strategy(ds)
1120   else
1121     super
1122   end
1123 end
filter_by_associations_conditions_associated_keys() click to toggle source
     # File lib/sequel/model/associations.rb
1125 def filter_by_associations_conditions_associated_keys
1126   qualify(associated_class.table_name, self[:keys])
1127 end
filter_by_associations_conditions_key() click to toggle source
     # File lib/sequel/model/associations.rb
1129 def filter_by_associations_conditions_key
1130   qualify(self[:model].table_name, self[:primary_key_column])
1131 end
filter_by_associations_limit_alias_key() click to toggle source
     # File lib/sequel/model/associations.rb
1133 def filter_by_associations_limit_alias_key
1134   Array(filter_by_associations_limit_key)
1135 end
filter_by_associations_limit_aliases() click to toggle source
     # File lib/sequel/model/associations.rb
1137 def filter_by_associations_limit_aliases
1138   filter_by_associations_limit_alias_key.map(&:column)
1139 end
filter_by_associations_limit_key() click to toggle source
     # File lib/sequel/model/associations.rb
1141 def filter_by_associations_limit_key
1142   qualify(associated_class.table_name, associated_class.primary_key)
1143 end
predicate_key_methods() click to toggle source
     # File lib/sequel/model/associations.rb
1145 def predicate_key_methods
1146   self[:primary_keys]
1147 end
reciprocal_association?(assoc_reflect) click to toggle source
     # File lib/sequel/model/associations.rb
1149 def reciprocal_association?(assoc_reflect)
1150   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
1151 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
1154 def reciprocal_type
1155   :many_to_one
1156 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
1161 def true_eager_graph_limit_strategy
1162   r = super
1163   ds = associated_dataset
1164   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?)
1165     :correlated_subquery
1166   else
1167     r
1168   end
1169 end