Question

我搜索了高低，发现很多帖子都很相似，但似乎无法调试以下代码。

我有一个项目模型，有很多团队。它有很多用户通过团队。以下是相关模型。

project.rb

 class Project < ActiveRecord::Base
   has_many :teams
   has_many :users, :through =>  :teams

   accepts_nested_attributes_for :teams
 end

team.rb

class Team < ActiveRecord::Base
  belongs_to :project
  belongs_to :user
end

user.rb

 class User < ActiveRecord::Base
   has_many :teams
   has_many :projects, :through => :teams
 end

projects_controller.rb

class ProjectsController < ApplicationController
  def index
    @projects = Project.all
  end

  def new
    @project = Project.new
  end

  def create
    @project = Project.create(project_params)
    redirect_to projects_url
  end

  def show
    @project = Project.find(params[:id])
  end

  def edit
    @project = Project.find(params[:id])
  end

  def update
    @project = Project.find(params[:id])
    @project.update(type_params)
    redirect_to project_url
  end

  def destroy
    @project = Project.find(params[:id])
    @project.destroy
    redirect_to projects_url
  end

end

private

def project_params
  params.require(:project)
  project_params = params.require(:project).
  permit(:name, :code, :description, :externalId,
       {:teams_attributes => [:id, :userId, :projectId]})
end

我有一个嵌套的表单，应该允许我创建一个新项目和一个团队（只需键入ID），但是我得到一个未允许的参数异常（“未经许可的参数：团队”）

每当我提交表格时。表格代码如下。

new.html.erb

<h1>Create New Project</h1>

<%=form_for(@project) do |f| %>

<p>
  <%=f.label "Name"%>
  <%=f.text_field :name%> <br>

  <%=f.label "Code"%>
  <%=f.text_field :code%> <br>

  <%=f.label "External ID"%>
  <%=f.text_field :externalId%> <br>

  <%=f.label "Description"%>
  <%=f.text_field :description%> <br>
</p>

<ul>
  <%= f.fields_for :team do |tf| %>
      <li>
        <%= tf.label 'User Id' %>
        <%= tf.text_field :userId %>
        <%= tf.label 'Project Id' %>
        <%= tf.text_field :projectId %>
      </li>
</ul>
  <%end%>
 <%=f.submit%>

 <%end%>

我特别注意允许的参数字段，并认为我把它们弄好了，但是，rails不同意。

任何帮助将不胜感激

Answer 1

像这样更改此方法并尝试

private

def project_params
  params.require(:project)
  project_params = params.require(:project).
  permit(:name, :code, :description, :externalId,
       {:teams_attributes => [:id, :userId, :projectId]})
end

到

private

def project_params
  params[:project].permit(:name, :code, :description, :externalId,
       {:teams_attributes => [:id, :userId, :projectId]})
end

Answer 2

您的嵌套表单不适用于has_many，因为它是单一的。您想要使用f.fields_for :teams do代替（复数）。请尝试以下更改：

<强> project_controller.rb

def new
  @project = Project.new
  @project.teams.build
end

[...]
private
  [...]
  # Never trust parameters from the scary internet, only allow the white list through.
  def project_params
    params.require(:project).permit(:name, :code, :externalId, :description, teams_attributes: [ :user_id, :project_id ])
  end

<强> new.html.erb

<h1>Create New Project</h1>

<%=form_for(@project) do |f| %>
  <p>
    <%=f.label "Name"%>
    <%=f.text_field :name%> <br>

    <%=f.label "Code"%>
    <%=f.text_field :code%> <br>

    <%=f.label "External ID"%>
    <%=f.text_field :externalId%> <br>

    <%=f.label "Description"%>
    <%=f.text_field :description%> <br>
  </p>

  <ul>
    <%= f.fields_for :teams do |tf| %>
      <li>
        <%= tf.label 'User Id' %>
        <%= tf.text_field :user_id %>
        <%= tf.label 'Project Id' %>
        <%= tf.text_field :project_id %>
      </li>
    <%end%>
  </ul>
  <%=f.submit%>
<%end%>

Rails 4嵌套形式中无法解释的不允许的参数错误

2 个答案: