has_many through form and adding attribute to join table

问题

This is my first stakoverflow question and fairly new to Rails. I've searched through previous similar questions but can't seem to figure this one out. I have a has_many through relationship with Users and Accounts and I have an extra boolean attribute "account_admin" on the UserAccount model (join table). I'm trying to figure out how to set this when I create a new Account.

User:

class User < ActiveRecord::Base
  has_many :user_accounts, :dependent => :destroy
  has_many :accounts, :through => :user_accounts
  ..
end

Account:

class Account < ActiveRecord::Base
  has_many :user_accounts, :dependent => :destroy
  has_many :users, :through => :user_accounts
end

UserAccount:

class UserAccount < ActiveRecord::Base
  belongs_to :user
  belongs_to :account
  # includes account_admin boolean
end

I would like to be able to create an account, assign users to that account, and designate an account_admin all in one form. I have this so far which allows me to select the users in an account but I'm not sure how to set the account_admin boolean here as well.

= simple_form_for @account do |f|
  = f.input :name
  = f.input :description
  = f.association :users, label_method: :to_label, :as => :check_boxes
  = f.button :submit

Appreciate any tips. Thanks

回答1:

Account model:

class Account < ActiveRecord::Base
  attr_accessible :name, :description,  :user_accounts_attributes
  has_many :user_accounts, :dependent => :destroy
  has_many :users, :through => :user_accounts
  has_many :user_without_accounts, :class_name => 'User', :finder_sql => Proc.new {
       %Q{
         SELECT *
         FROM users where id NOT IN (Select user_id from user_accounts where account_id = #{id})
       }
   }

  accepts_nested_attributes_for :user_accounts, reject_if:  proc { |attributes| attributes['user_id'] == '0' }

 def without_accounts
    new_record? ? User.all :  user_without_accounts
 end
end

In form:

= simple_form_for @account do |f|
  = f.input :name
  = f.input :description
  - @account.user_accounts.each do |user_account|
  = f.simple_fields_for :user_accounts, user_account do |assignment|
    = assignment.check_box :user_id
    = assignment.label :user_id, user_account.user.name rescue raise  user_account.inspect
    = assignment.input :account_admin
    %hr
  - @account.without_accounts.each do |user|
    = f.simple_fields_for :user_accounts, @account.user_accounts.build do |assignment|
    = assignment.check_box :user_id
    = assignment.label :user_id, user.name
    = assignment.input :account_admin
    %hr
  = f.button :submit

来源：https://stackoverflow.com/questions/17300152/has-many-through-form-and-adding-attribute-to-join-table

标签

ruby-on-rails

ruby

simple-form

has-many-through