class Sequel::Model::Associations::ManyToManyAssociationReflection

Public Instance Methods

associated_key_alias() click to toggle source

The alias to use for the associated key when eagerly loading

# File lib/sequel/model/associations.rb, line 458
def associated_key_alias
  self[:left_key_alias]
end
associated_key_column() click to toggle source

The column to use for the associated key when eagerly loading

# File lib/sequel/model/associations.rb, line 463
def associated_key_column
  self[:left_key]
end
associated_key_table() click to toggle source
Alias for: join_table_alias
associated_object_keys() click to toggle source

Alias of #right_primary_keys

# File lib/sequel/model/associations.rb, line 468
def associated_object_keys
  right_primary_keys
end
can_have_associated_objects?(obj) click to toggle source

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

# File lib/sequel/model/associations.rb, line 474
def can_have_associated_objects?(obj)
  !self[:left_primary_keys].any?{|k| obj.send(k).nil?}
end
default_associated_key_alias() click to toggle source

The default associated key alias(es) to use when eager loading associations via eager.

# File lib/sequel/model/associations.rb, line 480
def default_associated_key_alias
  self[:uses_left_composite_keys] ? (0...self[:left_keys].length).map{|i| :"x_foreign_key_#{i}_x"} : :x_foreign_key_x
end
default_join_table() click to toggle source

Default name symbol for the join table.

# File lib/sequel/model/associations.rb, line 485
def default_join_table
  [self[:class_name], self[:model].name].map{|i| underscore(pluralize(demodulize(i)))}.sort.join('_').to_sym
end
default_left_key() click to toggle source

Default foreign key name symbol for key in join table that points to current table's primary key (or :left_primary_key column).

# File lib/sequel/model/associations.rb, line 491
def default_left_key
  :"#{underscore(demodulize(self[:model].name))}_id"
end
default_right_key() click to toggle source

Default foreign key name symbol for foreign key in join table that points to the association's table's primary key (or :#right_primary_key column).

# File lib/sequel/model/associations.rb, line 497
def default_right_key
  :"#{singularize(self[:name])}_id"
end
eager_loader_key() click to toggle source

The key to use for the key hash when eager loading

# File lib/sequel/model/associations.rb, line 502
def eager_loader_key
  cached_fetch(:eager_loader_key){self[:left_primary_key]}
end
eager_loading_predicate_key() click to toggle source

The hash key to use for the eager loading predicate (left side of IN (1, 2, 3)). The left key qualified by the join table.

# File lib/sequel/model/associations.rb, line 508
def eager_loading_predicate_key
  cached_fetch(:eager_loading_predicate_key){qualify(join_table_alias, self[:left_key])}
end
Also aliased as: qualified_left_key
eager_loading_use_associated_key?() click to toggle source

many_to_many associations need to select a key in an associated table to eagerly load

# File lib/sequel/model/associations.rb, line 519
def eager_loading_use_associated_key?
  true
end
join_table_alias() click to toggle source

The join table itself, unless it is aliased, in which case this is the alias.

# File lib/sequel/model/associations.rb, line 531
def join_table_alias
  cached_fetch(:join_table_alias) do
    s, a = split_join_table_alias
    a || s
  end
end
Also aliased as: associated_key_table
join_table_source() click to toggle source

The source of the join table. This is the join table itself, unless it is aliased, in which case it is the unaliased part.

# File lib/sequel/model/associations.rb, line 525
def join_table_source
  cached_fetch(:join_table_source){split_join_table_alias[0]}
end
need_associated_primary_key?() click to toggle source

Whether the associated object needs a primary key to be added/removed, true for many_to_many associations.

# File lib/sequel/model/associations.rb, line 541
def need_associated_primary_key?
  true
end
qualified_left_key() click to toggle source
qualified_right_key() click to toggle source

The right key qualified by the join table.

# File lib/sequel/model/associations.rb, line 514
def qualified_right_key
  cached_fetch(:qualified_right_key){qualify(join_table_alias, self[:right_key])}
end
qualified_right_primary_key() click to toggle source

#right_primary_key qualified by the associated table

# File lib/sequel/model/associations.rb, line 565
def qualified_right_primary_key
  cached_fetch(:qualified_right_primary_key){qualify_assoc(right_primary_key)}
end
reciprocal() click to toggle source

Returns the reciprocal association symbol, if one exists.

# File lib/sequel/model/associations.rb, line 546
def reciprocal
  cached_fetch(:reciprocal) do
    left_keys = self[:left_keys]
    right_keys = self[:right_keys]
    join_table = self[:join_table]
    recip = nil
    associated_class.all_association_reflections.each do |assoc_reflect|
      if assoc_reflect[:type] == :many_to_many && assoc_reflect[:left_keys] == right_keys &&
         assoc_reflect[:right_keys] == left_keys && assoc_reflect[:join_table] == join_table &&
         assoc_reflect.associated_class == self[:model]
        recip = assoc_reflect[:name]
        break
      end
    end
    recip
  end
end
right_primary_key() click to toggle source

The primary key column(s) to use in the associated table (can be symbol or array).

# File lib/sequel/model/associations.rb, line 570
def right_primary_key
  cached_fetch(:right_primary_key){associated_class.primary_key}
end
right_primary_key_method() click to toggle source

The method symbol or array of method symbols to call on the associated objects to get the foreign key values for the join table.

# File lib/sequel/model/associations.rb, line 581
def right_primary_key_method
  cached_fetch(:right_primary_key_method){right_primary_key}
end
right_primary_key_methods() click to toggle source

The array of method symbols to call on the associated objects to get the foreign key values for the join table.

# File lib/sequel/model/associations.rb, line 587
def right_primary_key_methods
  cached_fetch(:right_primary_key_methods){Array(right_primary_key_method)}
end
right_primary_keys() click to toggle source

The primary key columns to use in the associated table (always array).

# File lib/sequel/model/associations.rb, line 575
def right_primary_keys
  cached_fetch(:right_primary_keys){Array(right_primary_key)}
end
select() click to toggle source

The columns to select when loading the association, associated_class.table_name.* by default.

# File lib/sequel/model/associations.rb, line 592
def select
 cached_fetch(:select){Sequel::SQL::ColumnAll.new(associated_class.table_name)}
end