使用具有关联 belongs_to 的表单将新记录输入数据库

Question

我对 rails 上的 ruby 比较陌生，所以请多多包涵。我正在尝试创建一个应用程序，其中有许多项目与每个项目相关的特定问题。以下是我的代码：

我的模特：

class Issue < ActiveRecord::Base
belongs_to :project
end

class Project < ActiveRecord::Base
has_many :issues
has_and_belongs_to_many :users
validates :name, :description, :manager, presence: true
validates :name, uniqueness: true
end

我的控制器：

在project_controller.rb

def create
@project = Project.new(project_params)

respond_to do |format|
  if @project.save
    format.html { redirect_to @project, notice: "Project #{@project.name} was successfully created." }
    format.json { render :show, status: :created, location: @project }
  else
    format.html { render :new }
    format.json { render json: @project.errors, status: :unprocessable_entity }
  end
end
end

在issues_controller.rb

def create        
@issue = Issue.new(params[:issue])
project = Project.find(params[:project_id])


respond_to do |format|
  if @issue.save
    format.html { redirect_to root_path, notice: "A new Issue was successfully added to project #{project.name}." }
    format.json { render :show, status: :created, location: @issue }
  else
    format.html { render :new }
    format.json { render json: @issue.errors, status: :unprocessable_entity }
  end
end
end

我的项目索引 html 文件也是我的根 url:

<tbody>
<% @projects.each do |project| %>
  <tr>
    <td><%= project.name %></td>
    <td><%= project.manager %></td>
    <td><%= project.description %></td>
    <td><%= project.created_at.strftime("%d %B %Y @ %H:%M") %></td>
    <td><%= button_to 'Report An Issue', new_issue_path(project_id: project) %>
    <td><%= link_to 'Show', project %></td>
    <td><%= link_to 'Edit', edit_project_path(project) %></td>
    <td><%= link_to 'Destroy', project, method: :delete, data: { confirm: 'Are you sure?' } %></td>
  </tr>
<% end %>

我的问题是我应该如何在 issues_controller.rb 中定义创建方法以打开 new.html.erb 表单从用户那里获取输入然后保存在数据库中同时链接到项目报告问题提到的按钮。我将不胜感激我可以查看的任何答案、见解或其他链接。

_form.html.erb

    <%= form_for(@issue) do |f| %>
  <% if @issue.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@issue.errors.count, "error") %> 
      prohibited this  issue from being saved:</h2>

      <ul>
      <% @issue.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <fieldset>
  <legend><strong>Enter Issue Details</strong></legend>
  <div class="field">
    <%= f.label :description %><br>
    <%= f.text_area :description %>
  </div>
  <div class="field">
    <%= f.label :type %><br>
    <%= f.text_field :type %>
  </div>
  <div class="field">
    <%= f.label :status %><br>
    <%= f.text_field :status %>
  </div>
  <div class="field">
    <%= f.label :reporter %><br>
    <%= f.text_field :reporter %>
  </div>
  <div class="field">
    <%= f.label :remarks %><br>
    <%= f.text_area :remarks %>
  </div>
  <div class="field">
    <%= f.label :priority %><br>
    <%= f.text_field :priority %>
  </div>
  <div class="field">
    <%= f.label :assignedto %><br>
    <%= f.text_field :assignedto %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
  </fieldset>
  <% end %>

new.html.erb

<h1>New Issue</h1>

   <%= render 'form' %>

   <%= link_to 'Back', issues_path %>

我必须手动重新输入 url /issues/new?project_id=15 才能打开表单页面，否则我会收到路由错误，提交后它会给我 Couldn't找到 'id'=

的项目

Answer 1

你走对了，你已经创建了一个关联，现在你只需要像这样在创建方法中引用项目：

def new 
  @project = Project.find params[:project_id]
  @issue = @project.issues.build 
end


def create  
  @project = Project.find(params[:project_id])      
  @issue = @project.issues.build(issue_params)
  ## rest of code
end

那么在你的 _form.html.erb 中你现在应该有：

form_for [@project,@issue] 
   #rest of code

使用具有关联 belongs_to 的表单将新记录输入数据库

Input new record into database using a form with the association belongs_to

ruby-on-rails

controller

associations

belongs-to

button-to