ActiveRecord::JsonHasMany
Instead of keeping the foreign keys on the children, or in a many-to-many join table, let's keep them in a JSON array on the parent.
Usage
require "active_record/json_has_many"
ActiveRecord::Schema.define do
create_table :parents do |t|
t.text :child_ids
end
create_table :children
end
class Parent < ActiveRecord::Base
json_has_many :children
endThis will add some familiar has_many-style methods:
parent.children? #=> false
parent.children = [Child.create!, Child.create!, Child.create!]
parent.children #=> [#<Child id: 1>, #<Child id: 2>, #<Child id: 3>]
parent.child_ids = [1,2]
parent.child_ids #=> [1,2]
parent.children? #=> trueIt also adds a scope class method for implementing the inverse relationship on the child:
class Child
def parents
Parent.where_json_array_includes(child_ids: id)
end
end
child = Child.create!
parent = Parent.create children: [child]
child.parents == [parent] #=> trueRequirements
- Ruby 2.0+
Contributing
- Fork it ( https://github.com/[my-github-username]/active_record-json_has_many/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request