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Rails HABTM作用域到当前子域

has-and-belongs-to-many associations ruby-on-rails

0

Rabbott · 技术社区 · 16 年前

我有以下联想:

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

我遇到的问题是,在使用默认的HABTM功能和复选框列表时,保存时,Rails会删除所有用户->品牌关联,然后重新添加我刚刚提交的表单中的关联。。

我如何界定范围,只删除属于当前公司的品牌关联,在子域中定义?

1 回复 | 直到 16 年前

1

0

Rabbott 16 年前

# 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)