module Sequel::Plugins::ManyThroughMany::ClassMethods

  1. lib/sequel/plugins/many_through_many.rb

Methods

Public Instance

  1. many_through_many
  2. one_through_many

Public Instance methods

many_through_many(name, through, opts=OPTS, &block)

Create a many_through_many association. Arguments:

name

Same as associate, the name of the association.

through

The tables and keys to join between the current table and the associated table. Must be an array, with elements that are either 3 element arrays, or hashes with keys :table, :left, and :right. The required entries in the array/hash are:

:table (first array element)

The name of the table to join.

:left (middle array element)

The key joining the table to the previous table. Can use an array of symbols for a composite key association.

:right (last array element)

The key joining the table to the next table. Can use an array of symbols for a composite key association.

If a hash is provided, the following keys are respected when using eager_graph:

:db

The Database containing the table. This changes lookup to use a separate query for each join table.

:block

A proc to use as the block argument to join.

:conditions

Extra conditions to add to the JOIN ON clause. Must be a hash or array of two pairs.

:join_type

The join type to use for the join, defaults to :left_outer.

:only_conditions

Conditions to use for the join instead of the ones specified by the keys.

opts

The options for the associaion. Takes the same options as many_to_many.

[show source] 
    # File lib/sequel/plugins/many_through_many.rb
247 def many_through_many(name, through, opts=OPTS, &block)
248   associate(:many_through_many, name, opts.merge(through.is_a?(Hash) ? through : {:through=>through}), &block)
249 end
one_through_many(name, through, opts=OPTS, &block)

Creates a one_through_many association. See many_through_many for arguments.

[show source] 
    # File lib/sequel/plugins/many_through_many.rb
252 def one_through_many(name, through, opts=OPTS, &block)
253   associate(:one_through_many, name, opts.merge(through.is_a?(Hash) ? through : {:through=>through}), &block)
254 end