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
981 def apply_eager_graph_limit_strategy(strategy, ds)
982   case strategy
983   when :correlated_subquery
984     apply_correlated_subquery_limit_strategy(ds)
985   else
986     super
987   end
988 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
991 def associated_object_keys
992   self[:keys]
993 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
997 def can_have_associated_objects?(obj)
998   !self[:primary_keys].any?{|k| obj.get_column_value(k).nil?}
999 end
cloneable?(ref) click to toggle source

one_to_many and one_to_one associations can be clones

     # File lib/sequel/model/associations.rb
1002 def cloneable?(ref)
1003   ref[:type] == :one_to_many || ref[:type] == :one_to_one
1004 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
1008 def default_key
1009   :"#{underscore(demodulize(self[:model].name))}_id"
1010 end
finalize_settings() click to toggle source
     # File lib/sequel/model/associations.rb
1015 def finalize_settings
1016   FINALIZE_SETTINGS
1017 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
1020 def handle_silent_modification_failure?
1021   self[:raise_on_save_failure] == false
1022 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
1025 def predicate_key
1026   cached_fetch(:predicate_key){qualify_assoc(self[:key])}
1027 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
1031 def primary_key
1032   self[:primary_key]
1033 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
1036 def qualified_primary_key
1037   cached_fetch(:qualified_primary_key){qualify_cur(primary_key)}
1038 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
1042 def reciprocal_array?
1043   false
1044 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
1047 def remove_before_destroy?
1048   false
1049 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
1052 def remove_should_check_existing?
1053   true
1054 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
1057 def set_reciprocal_to_self?
1058   true
1059 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
1066 def apply_correlated_subquery_limit_strategy(ds)
1067   table = ds.first_source_table
1068   table_alias = ds.first_source_alias
1069   primary_key = associated_class.primary_key
1070   key = self[:key]
1071   cs_alias = :t1
1072   cs = associated_dataset.
1073     from(Sequel.as(table, :t1)).
1074     select(*qualify(cs_alias, primary_key)).
1075     where(Array(qualify(cs_alias, key)).zip(Array(qualify(table_alias, key)))).
1076     limit(*limit_and_offset)
1077   ds.where(qualify(table_alias, primary_key)=>cs)
1078 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
1081 def apply_filter_by_associations_limit_strategy(ds)
1082   case filter_by_associations_limit_strategy
1083   when :correlated_subquery
1084     apply_correlated_subquery_limit_strategy(ds)
1085   else
1086     super
1087   end
1088 end
filter_by_associations_conditions_associated_keys() click to toggle source
     # File lib/sequel/model/associations.rb
1090 def filter_by_associations_conditions_associated_keys
1091   qualify(associated_class.table_name, self[:keys])
1092 end
filter_by_associations_conditions_key() click to toggle source
     # File lib/sequel/model/associations.rb
1094 def filter_by_associations_conditions_key
1095   qualify(self[:model].table_name, self[:primary_key_column])
1096 end
filter_by_associations_limit_alias_key() click to toggle source
     # File lib/sequel/model/associations.rb
1098 def filter_by_associations_limit_alias_key
1099   Array(filter_by_associations_limit_key)
1100 end
filter_by_associations_limit_aliases() click to toggle source
     # File lib/sequel/model/associations.rb
1102 def filter_by_associations_limit_aliases
1103   filter_by_associations_limit_alias_key.map(&:column)
1104 end
filter_by_associations_limit_key() click to toggle source
     # File lib/sequel/model/associations.rb
1106 def filter_by_associations_limit_key
1107   qualify(associated_class.table_name, associated_class.primary_key)
1108 end
predicate_key_methods() click to toggle source
     # File lib/sequel/model/associations.rb
1110 def predicate_key_methods
1111   self[:primary_keys]
1112 end
reciprocal_association?(assoc_reflect) click to toggle source
     # File lib/sequel/model/associations.rb
1114 def reciprocal_association?(assoc_reflect)
1115   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
1116 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
1119 def reciprocal_type
1120   :many_to_one
1121 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
1126 def true_eager_graph_limit_strategy
1127   r = super
1128   ds = associated_dataset
1129   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?)
1130     :correlated_subquery
1131   else
1132     r
1133   end
1134 end