我的应用程序要求Courses
Projects
Groups
Users.
users
我需要确保project
每class Group < ActiveRecord::Base
attr_accessible :name, :project_id
#has_and_belongs_to_many fields
attr_accessible :user_ids
has_and_belongs_to_many :users
belongs_to :project, :inverse_of => :groups
validates :name, :project_id, :presence => true
validates :user_ids, :uniqueness => { :scope => :project_id,
:message => "Users can only be in one group per project." }
end
不会出现一次以上ActiveAdmin.register Group do
form do |f|
f.inputs do
f.input :name
f.input :users, :as => :check_boxes
f.input :project
end
f.buttons
end
end
我认为我可以通过Rails验证来实现,但我所拥有的似乎并不想工作。任何人都可以帮我解决这个问题吗?
以下内容给了我:
Admin中的NoMethodError :: GroupsController #create
未定义的方法`text?'为零:NilClass
{{1}}
ActiveAdmin Group对象:
{{1}}
答案 0 :(得分:0)
我会尝试
Course
has_many :projects
Project
has_many :groups
has_many :users, :through => groups
validates uniqueness_of :user
User
has_many groups
has_many projects, :through => :groups
Group
belongs_to :project
belongs_to :group
# I stay away from has_and_belongs_to_many, not flexible later.