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:
The name of the table to join.
The key joining the table to the previous table. Can use an array of symbols for a composite key association.
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:
A proc to use as the block argument to join.
Extra conditions to add to the JOIN ON clause. Must be a hash or array of two pairs.
The join type to use for the join, defaults to :left_outer.
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.
# File lib/sequel/plugins/many_through_many.rb, line 137 def many_through_many(name, through, opts={}, &block) associate(:many_through_many, name, opts.merge(through.is_a?(Hash) ? through : {:through=>through}), &block) end