Class: Sequel::Model::Associations::ManyToOneAssociationReflection

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

Constant Summary

Constants inherited from AssociationReflection

AssociationReflection::ASSOCIATION_DATASET_PROC

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 AssociationReflection

#_add_method, #_remove_all_method, #_remove_method, #_setter_method, #add_method, #apply_dataset_changes, #apply_distinct_on_eager_limit_strategy, #apply_eager_dataset_changes, #apply_eager_graph_limit_strategy, #apply_eager_limit_strategy, #apply_ruby_eager_limit_strategy, #apply_window_function_eager_limit_strategy, #assign_singular?, #associated_class, #associated_dataset, #association_dataset_for, #association_dataset_proc, #association_method, #cloneable?, #dataset_method, #delete_row_number_column, #eager_load_results, #eager_loader_key, #eager_loading_predicate_key, #eager_loading_use_associated_key?, #filter_by_associations_add_conditions?, #filter_by_associations_conditions_expression, #handle_silent_modification_failure?, #initialize_association_cache, #limit_and_offset, #need_associated_primary_key?, #placeholder_loader, #predicate_key_values, #predicate_keys, #qualify, #qualify_assoc, #qualify_cur, #reciprocal, #remove_all_method, #remove_before_destroy?, #remove_method, #remove_should_check_existing?, #select, #setter_method, #slice_range

Methods included from Inflections

clear, irregular, plural, singular, uncountable

Methods inherited from Hash

#&, #case, #hstore, #pg_json, #pg_jsonb, #sql_expr, #sql_negate, #sql_or, #|, #~

Instance Method Details

#can_have_associated_objects?(obj) ⇒ Boolean

many_to_one associations can only have associated objects if none of the :keys options have a nil value.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 740

def can_have_associated_objects?(obj)
  !self[:keys].any?{|k| obj.get_column_value(k).nil?}
end

#dataset_need_primary_key? ⇒ Boolean

Whether the dataset needs a primary key to function, false for many_to_one associations.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 745

def dataset_need_primary_key?
  false
end

#default_key ⇒ Object

Default foreign key name symbol for foreign key in current model’s table that points to the given association’s table’s primary key.



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# File 'lib/sequel/model/associations.rb', line 751

def default_key
  :"#{self[:name]}_id"
end

#eager_graph_lazy_dataset? ⇒ Boolean

Whether to eagerly graph a lazy dataset, true for many_to_one associations only if the key is nil.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 757

def eager_graph_lazy_dataset?
  self[:key].nil?
end

#eager_graph_limit_strategy(_) ⇒ Object

many_to_one associations don’t need an eager_graph limit strategy



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# File 'lib/sequel/model/associations.rb', line 762

def eager_graph_limit_strategy(_)
  nil
end

#eager_limit_strategy ⇒ Object

many_to_one associations don’t need an eager limit strategy



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# File 'lib/sequel/model/associations.rb', line 767

def eager_limit_strategy
  nil
end

#filter_by_associations_limit_strategy ⇒ Object

many_to_one associations don’t need a filter by associations limit strategy



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# File 'lib/sequel/model/associations.rb', line 772

def filter_by_associations_limit_strategy
  nil
end

#predicate_key ⇒ Object

The expression to use on the left hand side of the IN lookup when eager loading



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# File 'lib/sequel/model/associations.rb', line 777

def predicate_key
  cached_fetch(:predicate_key){qualified_primary_key}
end

#primary_key ⇒ Object

The column(s) in the associated table that the key in the current table references (either a symbol or an array).



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# File 'lib/sequel/model/associations.rb', line 782

def primary_key
 cached_fetch(:primary_key){associated_class.primary_key || raise(Error, "no primary key specified for #{associated_class.inspect}")}
end

#primary_key_method ⇒ Object

The method symbol or array of method symbols to call on the associated object to get the value to use for the foreign keys.



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# File 'lib/sequel/model/associations.rb', line 794

def primary_key_method
 cached_fetch(:primary_key_method){primary_key}
end

#primary_key_methods ⇒ Object

The array of method symbols to call on the associated object to get the value to use for the foreign keys.



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# File 'lib/sequel/model/associations.rb', line 800

def primary_key_methods
 cached_fetch(:primary_key_methods){Array(primary_key_method)}
end

#primary_keys ⇒ Object Also known as: associated_object_keys

The columns in the associated table that the key in the current table references (always an array).



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# File 'lib/sequel/model/associations.rb', line 787

def primary_keys
 cached_fetch(:primary_keys){Array(primary_key)}
end

#qualified_primary_key ⇒ Object

#primary_key qualified by the associated table



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# File 'lib/sequel/model/associations.rb', line 805

def qualified_primary_key
  cached_fetch(:qualified_primary_key){self[:qualify] == false ? primary_key : qualify_assoc(primary_key)}
end

#reciprocal_array? ⇒ Boolean

True only if the reciprocal is a one_to_many association.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 810

def reciprocal_array?
  !set_reciprocal_to_self?
end

#returns_array? ⇒ Boolean

Whether this association returns an array of objects instead of a single object, false for a many_to_one association.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 816

def returns_array?
  false
end

#set_reciprocal_to_self? ⇒ Boolean

True only if the reciprocal is a one_to_one association.

Returns:

  • (Boolean) 


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# File 'lib/sequel/model/associations.rb', line 821

def set_reciprocal_to_self?
  reciprocal
  reciprocal_type == :one_to_one
end