Question

我有两个类用户/ Blip，我通过User_blips连接表加入。但是当我在表单中提交Blip时，它不会将任何数据保存到连接表中。你能帮我搞清楚为什么吗？（作为一个额外的问题，即使我把＃34; sentence_id＆＃34;放在强大的参数中，它仍然会抛出一个错误，说它未被允许）

Blip模型：

has_many :users, through: :user_blips
has_many :user_blips, dependent: :nullify

用户模型：

has_many :blipped_users, through: :user_blips, source: :blip
has_many :user_blips, dependent: :nullify

Blip create method：

def create
@sentence = Sentence.find params[:sentence_id]
@blip = Blip.new blip_params
@blip.sentence = @sentence

 if @blip.save
  flash[:success] = "Blip created successfully"
  redirect_to root_path
 else
  flash[:alert] = "Your blip was not created"
  redirect_to root_path
 end
end

def blip_params
 params.require(:blip).permit(:body)
end

Blip Create上的控制台消息：

Started POST "/sentences/1/blips" for 127.0.0.1 at 2015-02-22 12:13:58     -0800
Processing by BlipsController#create as HTML
Parameters: {"utf8"=>"✓",     "authenticity_token"=>"bsXf7SqWJxv2XjOy79RDvDcpJTZnFJhJj+R50CzBFPyqbHsgo5jt    vdrpFuOjHmZ0q+pIyT5tPdR0Ia2cXCJcGQ==", "blip"=>{"'sentence_id'"=>"1",     "body"=>"ddsdsds"}, "sentence_id"=>"1"}
Sentence Load (0.3ms)  SELECT  "sentences".* FROM "sentences" WHERE     "sentences"."id" = $1 LIMIT 1  [["id", 1]]
Unpermitted parameter: 'sentence_id'

(0.2ms)  BEGIN
SQL (0.4ms)  INSERT INTO "blips" ("body", "sentence_id", "created_at",     "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id"  [["body", "ddsdsds"],     ["sentence_id", 1], ["created_at", "2015-02-22 20:13:58.255772"],     ["updated_at", "2015-02-22 20:13:58.255772"]]
(0.4ms)  COMMIT
Redirected to http://localhost:3000/
Completed 302 Found in 11ms (ActiveRecord: 1.3ms)

Answer 1

您可以在加入表has_and_belongs_to_many rails guide

中使用association blips_users

用户模型：

has_and_belongs_to_many :blips

Blip模型：

has_and_belongs_to_many :users

迁移：

rails generate migration create_blips_users user_id:integer blip_id:integer; rake db:migrate

控制器：

def create
  user = User.first # or maybe current_user
  user.blips << Blip.new(create_params)
end

def create_params
  params.require(:blip).permit(:body, :sentence_id)
end

这将创建blip及其与user

的对应关联

多对多关系连接表不保存数据

1 个答案: