Question

我有以下关联：

class User < ActiveRecord::Base
  has_and_belongs_to_many :brands, :join_table => 'brands_users'
  has_and_belongs_to_many :companies, :join_table => 'companies_users'
end

class Brand < ActiveRecord::Base
  belongs_to                :company
  has_and_belongs_to_many   :users, :join_table => 'brands_users'
end

class Company < ActiveRecord::Base
  has_and_belongs_to_many   :users, :join_table => 'companies_users'
  has_many :brands, :order => :name
end

在编辑用户时，我使用的是品牌复选框列表。因此，我可以为用户分配品牌，显示的品牌只是属于当前公司的品牌（由子域[使用subdomain_fu]定义）。

我遇到的问题是，当使用默认的HABTM功能和复选框列表时，在保存时，Rails会删除所有用户 - ＆gt;品牌关联，然后只重新添加我刚刚提交的表单的关联。

如何将其范围仅移除属于子域中定义的当前公司的品牌关联？

Answer 1

这就是我做的..我最终将它放在控制器中，并在保存用户之前手动添加所有外部值。

# if admin clears all brand checkboxes the browser will ignore this change,
# so we will provide an empty array if this is the case, to make sure that
# the brands are removed
params[:user][:brand_ids] ||= []

@user = User.find(params[:id])

# collect brands for this user that are not part of this form to ensure they 
# arent removed by the rails habtm functionality
other_brands = @user.brands(:conditions => ['id NOT IN (?)', @company.brands])
other_brands.each do |ob|
  params[:user][:brand_ids] << ob.id
end

# reload the user object with the brands selected on this form, as well as 
# all their brands from other companies
@user.reload(params)

如果有人有更好的想法，我仍然希望听到它，因为我不知道这是否是最佳选择..

Rails HABTM确定当前子域

1 个答案: