行未添加到表中，但未给出错误

Question

我是 Rails 的新手。 我有一个名为TeamMemberships的表，它有 2 个外键：一个指向Users ，一个指向Teams 。 我想从Teams的show.html.erb页面向TeamMemberships表中添加一个TeamMembership元素，以便Team外键是调用操作的Team ，而User将由表单确定。 当我尝试添加TeamMembership ，页面按预期重定向，但是，没有添加表元素，也没有给出错误消息。 什么可能导致这种情况？ 以下是我的路线：

Rails.application.routes.draw do
  resources :instructors
  get 'static_pages/home'
  get 'static_pages/adminLanding'

  resources :audiences
  resources :comments
  resources :scores
  resources :projects
  resources :team_memberships
  resources :team_types
  resources :teams
  resources :users
  Rails.application.routes.draw do
    resources :teams do
      resources :team_memberships
    end
  end
  root 'static_pages#home'
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

这是来自teams/show.html.erb页面的链接：

<%= link_to 'Add a student', new_team_team_membership_path(@team.id) %>

这是TeamMemberships控制器中的new方法：

  def new
    @team_membership = TeamMembership.new(team_id: params[:team_id])
    @users = User.all

  end

这是表单的team_memberships/new.html.erb文件：

<h1>New Team Membership</h1>

<%= form_for @team_membership do |f| %>
  <%= f.select :user_id, options_for_select(@users.collect{ |student| [student.first_name + ' ' +student.last_name, student.id]}) %>
    <%= f.submit %>
  <% end %>

<%= link_to 'Back', team_memberships_path %>

这是TeamMemberships控制器的create方法：

  def create
    @users = User.all
    @team_membership = TeamMembership.new(team_membership_params)

    respond_to do |format|
      if @team_membership.save
        format.html { redirect_to @team_membership, notice: 'Team membership was successfully created.' }
        format.json { render :show, status: :created, location: @team_membership }
      else
        format.html { render :new }
        format.json { render json: @team_membership.errors, status: :unprocessable_entity }
      end
    end
  end

谢谢！

Answer 1

您没有在视图中显示错误，将其添加到您的new.html.erb并稍后根据您的需要设置样式

<% if @team_membership.errors.any? %>
  <ul>
    <% @team_membership.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
  </ul>
<% end %>

尝试一次！

Answer 2

你可以检查这些

• team_membership_params 应该允许您要保存的列
• TeamMembership 模型具有您需要的验证（否则在保存时会引发错误）