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| -rw-r--r-- | activerecord/lib/active_record/associations.rb | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb index fb8cf1cecc..4ec1c8d545 100644 --- a/activerecord/lib/active_record/associations.rb +++ b/activerecord/lib/active_record/associations.rb @@ -1578,6 +1578,18 @@ module ActiveRecord # * <tt>Developer#projects.create</tt> (similar to <tt>c = Project.new("developer_id" => id); c.save; c</tt>) # The declaration may include an +options+ hash to specialize the behavior of the association. # + # === Scopes + # + # You can pass a second argument +scope+ as a callable (i.e. proc or + # lambda) to retrieve a specific set of records or customize the generated + # query when you access the associated collection. + # + # Scope examples: + # has_and_belongs_to_many :projects, -> { includes :milestones, :manager } + # has_and_belongs_to_many :categories, ->(category) { + # where("default_category = ?", category.name) + # } + # # === Options # # [:class_name] |