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
1005 def apply_eager_graph_limit_strategy(strategy, ds)
1006   case strategy
1007   when :correlated_subquery
1008     apply_correlated_subquery_limit_strategy(ds)
1009   else
1010     super
1011   end
1012 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
1015 def associated_object_keys
1016   self[:keys]
1017 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
1021 def can_have_associated_objects?(obj)
1022   !self[:primary_keys].any?{|k| obj.get_column_value(k).nil?}
1023 end
cloneable?(ref) click to toggle source

one_to_many and one_to_one associations can be clones

     # File lib/sequel/model/associations.rb
1026 def cloneable?(ref)
1027   ref[:type] == :one_to_many || ref[:type] == :one_to_one
1028 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
1032 def default_key
1033   :"#{underscore(demodulize(self[:model].name))}_id"
1034 end
finalize_settings() click to toggle source
     # File lib/sequel/model/associations.rb
1039 def finalize_settings
1040   FINALIZE_SETTINGS
1041 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
1044 def handle_silent_modification_failure?
1045   self[:raise_on_save_failure] == false
1046 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
1049 def predicate_key
1050   cached_fetch(:predicate_key){qualify_assoc(self[:key])}
1051 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
1055 def primary_key
1056   self[:primary_key]
1057 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
1060 def qualified_primary_key
1061   cached_fetch(:qualified_primary_key){qualify_cur(primary_key)}
1062 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
1066 def reciprocal_array?
1067   false
1068 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
1071 def remove_before_destroy?
1072   false
1073 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
1076 def remove_should_check_existing?
1077   true
1078 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
1081 def set_reciprocal_to_self?
1082   true
1083 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
1090 def apply_correlated_subquery_limit_strategy(ds)
1091   table = ds.first_source_table
1092   table_alias = ds.first_source_alias
1093   primary_key = associated_class.primary_key
1094   key = self[:key]
1095   cs_alias = :t1
1096   cs = associated_dataset.
1097     from(Sequel.as(table, :t1)).
1098     select(*qualify(cs_alias, primary_key)).
1099     where(Array(qualify(cs_alias, key)).zip(Array(qualify(table_alias, key)))).
1100     limit(*limit_and_offset)
1101   ds.where(qualify(table_alias, primary_key)=>cs)
1102 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
1105 def apply_filter_by_associations_limit_strategy(ds)
1106   case filter_by_associations_limit_strategy
1107   when :correlated_subquery
1108     apply_correlated_subquery_limit_strategy(ds)
1109   else
1110     super
1111   end
1112 end
filter_by_associations_conditions_associated_keys() click to toggle source
     # File lib/sequel/model/associations.rb
1114 def filter_by_associations_conditions_associated_keys
1115   qualify(associated_class.table_name, self[:keys])
1116 end
filter_by_associations_conditions_key() click to toggle source
     # File lib/sequel/model/associations.rb
1118 def filter_by_associations_conditions_key
1119   qualify(self[:model].table_name, self[:primary_key_column])
1120 end
filter_by_associations_limit_alias_key() click to toggle source
     # File lib/sequel/model/associations.rb
1122 def filter_by_associations_limit_alias_key
1123   Array(filter_by_associations_limit_key)
1124 end
filter_by_associations_limit_aliases() click to toggle source
     # File lib/sequel/model/associations.rb
1126 def filter_by_associations_limit_aliases
1127   filter_by_associations_limit_alias_key.map(&:column)
1128 end
filter_by_associations_limit_key() click to toggle source
     # File lib/sequel/model/associations.rb
1130 def filter_by_associations_limit_key
1131   qualify(associated_class.table_name, associated_class.primary_key)
1132 end
predicate_key_methods() click to toggle source
     # File lib/sequel/model/associations.rb
1134 def predicate_key_methods
1135   self[:primary_keys]
1136 end
reciprocal_association?(assoc_reflect) click to toggle source
     # File lib/sequel/model/associations.rb
1138 def reciprocal_association?(assoc_reflect)
1139   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
1140 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
1143 def reciprocal_type
1144   :many_to_one
1145 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
1150 def true_eager_graph_limit_strategy
1151   r = super
1152   ds = associated_dataset
1153   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?)
1154     :correlated_subquery
1155   else
1156     r
1157   end
1158 end