Class: Sequel::Model::Associations::OneToOneAssociationReflection

Inherits:
OneToManyAssociationReflection show all
Defined in:
lib/sequel/model/associations.rb

Constant Summary

Constants included from Inflections

Inflections::CAMELIZE_CONVERT_REGEXP, Inflections::CAMELIZE_MODULE_REGEXP, Inflections::DASH, Inflections::DEMODULIZE_CONVERT_REGEXP, Inflections::EMPTY_STRING, Inflections::SLASH, Inflections::UNDERSCORE, Inflections::UNDERSCORE_CONVERT_REGEXP1, Inflections::UNDERSCORE_CONVERT_REGEXP2, Inflections::UNDERSCORE_CONVERT_REPLACE, Inflections::UNDERSCORE_MODULE_REGEXP, Inflections::VALID_CONSTANT_NAME_REGEXP

Instance Method Summary collapse

Methods inherited from OneToManyAssociationReflection

#associated_object_keys, #can_have_associated_objects?, #default_key, #eager_loader_key, #eager_loading_predicate_key, #primary_key, #qualified_primary_key, #reciprocal_array?, #remove_before_destroy?, #remove_should_check_existing?, #set_reciprocal_to_self?

Methods inherited from AssociationReflection

#_add_method, #_dataset_method, #_remove_all_method, #_remove_method, #_setter_method, #add_method, #associated_class, #association_method, #can_have_associated_objects?, #dataset_helper_method, #dataset_method, #dataset_need_primary_key?, #eager_graph_lazy_dataset?, #eager_loading_use_associated_key?, #need_associated_primary_key?, #qualify, #qualify_assoc, #qualify_cur, #reciprocal, #reciprocal_array?, #remove_all_method, #remove_before_destroy?, #remove_method, #remove_should_check_existing?, #select, #set_reciprocal_to_self?, #setter_method

Methods included from Inflections

clear, irregular, plural, singular, uncountable

Methods inherited from Hash

#&, #case, #sql_expr, #sql_negate, #sql_or, #|, #~

Instance Method Details

#eager_limit_strategy ⇒ Object

one_to_one associations don’t use an eager limit strategy by default, but support both DISTINCT ON and window functions as strategies.



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# File 'lib/sequel/model/associations.rb', line 389

def eager_limit_strategy
  fetch(:_eager_limit_strategy) do
    self[:_eager_limit_strategy] = case s = self[:eager_limit_strategy]
    when Symbol
      s
    when true
      ds = associated_class.dataset
      if ds.supports_ordered_distinct_on?
        :distinct_on
      elsif ds.supports_window_functions?
        :window_function
      end
    else
      nil
    end
  end
end

#limit_and_offset ⇒ Object

The limit and offset for this association (returned as a two element array).



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# File 'lib/sequel/model/associations.rb', line 408

def limit_and_offset
  [1, nil]
end

#returns_array? ⇒ Boolean

one_to_one associations return a single object, not an array

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 413

def returns_array?
  false
end