Class: Sequel::Model::Associations::ManyToManyAssociationReflection

### Home Classes Methods

### In Files

- lib/sequel/model/associations.rb

### Parent

Sequel::Model::Associations::AssociationReflection

### Methods

- #associated_key_alias
- #associated_key_column
- #associated_key_table
- #associated_object_keys
- #can_have_associated_objects?
- #default_associated_key_alias
- #default_join_table
- #default_left_key
- #default_right_key
- #eager_loader_key
- #eager_loading_use_associated_key?
- #need_associated_primary_key?
- #reciprocal
- #right_primary_key
- #right_primary_keys
- #select

### Files

- CHANGELOG
- COPYING
- README.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.2.0.txt
- 3.3.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

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# 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 299
    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 304
    def associated_key_column
      self[:left_key]
    end

associated_key_table() click to toggle source

The table containing the column to use for the associated key when eagerly loading

    # File lib/sequel/model/associations.rb, line 309
    def associated_key_table
      self[:join_table]
    end

associated_object_keys() click to toggle source

Alias of right_primary_keys

    # File lib/sequel/model/associations.rb, line 314
    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 320
    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 326
    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 331
    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 337
    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 343
    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 348
    def eager_loader_key
      self[:eager_loader_key] ||= self[:left_primary_key]
    end

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 353
    def eager_loading_use_associated_key?
      true
    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 359
    def need_associated_primary_key?
      true
    end

reciprocal() click to toggle source

Returns the reciprocal association symbol, if one exists.

    # File lib/sequel/model/associations.rb, line 364
    def reciprocal
      return self[:reciprocal] if include?(:reciprocal)
      left_keys = self[:left_keys]
      right_keys = self[:right_keys]
      join_table = self[:join_table]
      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]
          return self[:reciprocal] = assoc_reflect[:name]
        end
      end
      self[:reciprocal] = nil
    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 380
    def right_primary_key
      self[:right_primary_key] ||= associated_class.primary_key
    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 385
    def right_primary_keys
      self[: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 390
    def select
     return self[:select] if include?(:select)
     self[:select] ||= Sequel::SQL::ColumnAll.new(associated_class.table_name)
    end

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