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class User < ActiveRecord::Base | |
attr_accessible :name | |
has_many :admin_memberships, class_name: "Membership", conditions: {role: 'admin'} | |
has_many :editor_memberships, class_name: "Membership", conditions: {role: 'editor'} | |
def admin? | |
admin_memberships.exists? | |
end | |
def editor? | |
editor_memberships.exists? | |
end | |
end | |
class Group < ActiveRecord::Base | |
attr_accessible :name | |
has_many :admin_memberships, class_name: "Membership", conditions: {role: "admin"} | |
has_many :editor_memberships, class_name: "Membership", conditions: {role: "editor"} | |
has_many :admins, through: :admin_memberships, source: :user | |
has_many :editors, through: :editor_memberships, source: :user | |
end | |
class Membership < ActiveRecord::Base | |
attr_accessible :role | |
belongs_to :user | |
belongs_to :group | |
end | |
sam = User.new name: "Sam" | |
# => #<User id: 1, name: "Sam", created_at: "2012-04-05 11:45:54", updated_at: "2012-04-05 11:45:54"> | |
rainbows = Group.new name: "Rainbows" | |
# => #<Group id: 1, name: "Rainbows", created_at: "2012-04-05 11:46:06", updated_at: "2012-04-05 11:46:06"> | |
rainbows.admins << sam | |
# => [#<User id: 1, name: "Sam", created_at: "2012-04-05 11:45:54", updated_at: "2012-04-05 11:45:54">] | |
rainbows.admin_memberships | |
# => [#<Membership id: 2, user_id: 1, group_id: 1, role: "admin", created_at: "2012-04-05 11:48:58", updated_at: "2012-04-05 11:48:58">] | |
user.admin? | |
# Membership Exists (0.3ms) SELECT 1 FROM "memberships" WHERE "memberships"."user_id" = 1 AND "memberships"."role" = 'admin' LIMIT 1 | |
# => true |
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