module Sequel::Model::Associations::SingularAssociationReflection

Methods that turn an association that returns multiple objects into an association that returns a single object.

Public Instance Methods

assign_singular?() click to toggle source

Singular associations do not assign singular if they are using the ruby eager limit strategy and have a slice range, since they need to store the array of associated objects in order to pick the correct one with an offset.

Calls superclass method
     # File lib/sequel/model/associations.rb
1126 def assign_singular?
1127   super && (eager_limit_strategy != :ruby || !slice_range)
1128 end
filter_by_associations_add_conditions?() click to toggle source

Add conditions when filtering by singular associations with orders, since the underlying relationship is probably not one-to-one.

Calls superclass method
     # File lib/sequel/model/associations.rb
1132 def filter_by_associations_add_conditions?
1133   super || self[:order] || self[:eager_limit_strategy] || self[:filter_limit_strategy]
1134 end
limit_and_offset() click to toggle source

Make sure singular associations always have 1 as the limit

Calls superclass method
     # File lib/sequel/model/associations.rb
1137 def limit_and_offset
1138   r = super
1139   if r.first == 1
1140     r
1141   else
1142     [1, r[1]]
1143   end
1144 end
returns_array?() click to toggle source

Singular associations always return a single object, not an array.

     # File lib/sequel/model/associations.rb
1147 def returns_array?
1148   false
1149 end

Private Instance Methods

default_eager_limit_strategy() click to toggle source

Only use a eager limit strategy by default if there is an offset or an order.

Calls superclass method
     # File lib/sequel/model/associations.rb
1154 def default_eager_limit_strategy
1155   super if self[:order] || offset
1156 end
filter_by_associations_limit_strategy() click to toggle source

Use a strategy for filtering by associations if there is an order or an offset, or a specific limiting strategy has been specified.

Calls superclass method
     # File lib/sequel/model/associations.rb
1160 def filter_by_associations_limit_strategy
1161   super if self[:order] || offset || self[:eager_limit_strategy] || self[:filter_limit_strategy]
1162 end
true_eager_graph_limit_strategy() click to toggle source

Use the DISTINCT ON eager limit strategy for true if the database supports it.

Calls superclass method
     # File lib/sequel/model/associations.rb
1165 def true_eager_graph_limit_strategy
1166   if associated_class.dataset.supports_ordered_distinct_on? && !offset
1167     :distinct_on
1168   else
1169     super
1170   end
1171 end