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
990 def apply_eager_graph_limit_strategy(strategy, ds)
991   case strategy
992   when :correlated_subquery
993     apply_correlated_subquery_limit_strategy(ds)
994   else
995     super
996   end
997 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
1000 def associated_object_keys
1001   self[:keys]
1002 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
1006 def can_have_associated_objects?(obj)
1007   !self[:primary_keys].any?{|k| obj.get_column_value(k).nil?}
1008 end
cloneable?(ref) click to toggle source

one_to_many and one_to_one associations can be clones

     # File lib/sequel/model/associations.rb
1011 def cloneable?(ref)
1012   ref[:type] == :one_to_many || ref[:type] == :one_to_one
1013 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
1017 def default_key
1018   :"#{underscore(demodulize(self[:model].name))}_id"
1019 end
finalize_settings() click to toggle source
     # File lib/sequel/model/associations.rb
1024 def finalize_settings
1025   FINALIZE_SETTINGS
1026 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
1029 def handle_silent_modification_failure?
1030   self[:raise_on_save_failure] == false
1031 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
1034 def predicate_key
1035   cached_fetch(:predicate_key){qualify_assoc(self[:key])}
1036 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
1040 def primary_key
1041   self[:primary_key]
1042 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
1045 def qualified_primary_key
1046   cached_fetch(:qualified_primary_key){qualify_cur(primary_key)}
1047 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
1051 def reciprocal_array?
1052   false
1053 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
1056 def remove_before_destroy?
1057   false
1058 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
1061 def remove_should_check_existing?
1062   true
1063 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
1066 def set_reciprocal_to_self?
1067   true
1068 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
1075 def apply_correlated_subquery_limit_strategy(ds)
1076   table = ds.first_source_table
1077   table_alias = ds.first_source_alias
1078   primary_key = associated_class.primary_key
1079   key = self[:key]
1080   cs_alias = :t1
1081   cs = associated_dataset.
1082     from(Sequel.as(table, :t1)).
1083     select(*qualify(cs_alias, primary_key)).
1084     where(Array(qualify(cs_alias, key)).zip(Array(qualify(table_alias, key)))).
1085     limit(*limit_and_offset)
1086   ds.where(qualify(table_alias, primary_key)=>cs)
1087 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
1090 def apply_filter_by_associations_limit_strategy(ds)
1091   case filter_by_associations_limit_strategy
1092   when :correlated_subquery
1093     apply_correlated_subquery_limit_strategy(ds)
1094   else
1095     super
1096   end
1097 end
filter_by_associations_conditions_associated_keys() click to toggle source
     # File lib/sequel/model/associations.rb
1099 def filter_by_associations_conditions_associated_keys
1100   qualify(associated_class.table_name, self[:keys])
1101 end
filter_by_associations_conditions_key() click to toggle source
     # File lib/sequel/model/associations.rb
1103 def filter_by_associations_conditions_key
1104   qualify(self[:model].table_name, self[:primary_key_column])
1105 end
filter_by_associations_limit_alias_key() click to toggle source
     # File lib/sequel/model/associations.rb
1107 def filter_by_associations_limit_alias_key
1108   Array(filter_by_associations_limit_key)
1109 end
filter_by_associations_limit_aliases() click to toggle source
     # File lib/sequel/model/associations.rb
1111 def filter_by_associations_limit_aliases
1112   filter_by_associations_limit_alias_key.map(&:column)
1113 end
filter_by_associations_limit_key() click to toggle source
     # File lib/sequel/model/associations.rb
1115 def filter_by_associations_limit_key
1116   qualify(associated_class.table_name, associated_class.primary_key)
1117 end
predicate_key_methods() click to toggle source
     # File lib/sequel/model/associations.rb
1119 def predicate_key_methods
1120   self[:primary_keys]
1121 end
reciprocal_association?(assoc_reflect) click to toggle source
     # File lib/sequel/model/associations.rb
1123 def reciprocal_association?(assoc_reflect)
1124   super && self[:keys] == assoc_reflect[:keys] && primary_key == assoc_reflect.primary_key
1125 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
1128 def reciprocal_type
1129   :many_to_one
1130 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
1135 def true_eager_graph_limit_strategy
1136   r = super
1137   ds = associated_dataset
1138   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?)
1139     :correlated_subquery
1140   else
1141     r
1142   end
1143 end