我使用了nested_form gem,我正在尝试构建一个包含两个表(项目、问题)中的字段的表单。
我的模型:
class Project < ApplicationRecord
has_many :questions
accepts_nested_attributes_for :questions
end
class Question < ApplicationRecord
belongs_to :project
end
我的 Controller :
class ProjectsController < ApplicationController
layout 'application'
def index
@projects = Project.all
end
def show
@project = Project.find(params[:id])
end
def new
@project = Project.new
@questions = @project.questions.build
end
def create
@project = Project.new(project_params)
@project.save
respond_to do |format|
if @project.save
format.html { redirect_to @project, notice: 'Project 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
private
def project_params
params.require(:project).permit(:name, question_attributes: [:id, :content, :_delete])
end
end
我的看法:
<%= nested_form_for(@project) do |f| %>
<% if @project.errors.any? %>
<div id="error_explanation">
<h2>
<%= pluralize(@project.errors.count, "error") %> prohibited this project from being saved:</h2>
<ul>
<% @project.errors.full_messages.each do |message| %>
<li>
<%= message %>
</li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :questions do |builder| %>
<%= render "question_fields", :ff => builder %>
<% end %>
<p>
<%= f.link_to_add "Add a questions",:questions %>
</p>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
还有我的架构文件:
create_table "projects", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "questions", force: :cascade do |t|
t.integer "project_id"
t.string "content"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["project_id"], name: "index_questions_on_project_id", using: :btree
end
并且 _question_fields 文件是:
<p>
<%= ff.label :content, "Question" %>
<%= ff.text_area :content%>
<%= ff.link_to_remove "Remove this task"%>
</p>
表项目将被保存,但表问题无法保存。为什么?
修改这行代码后
def project_params
params.require(:project).permit(:name, questions_attributes: [:id, :content, :_delete])
end
我收到以下错误:
1 个错误禁止保存此项目:
问题项目必须存在
我也应用了更改,但这次没有任何内容无法保存。
def project_params
params.require(:project).permit(:name, questions_attributes: [:id, :content, :project_id, :_delete])
end
最佳答案
问题出在 project_params
上。由于您有 has_many :questions
,因此 question_attributes
应更改为 questions_attributes
def project_params
params.require(:project).permit(:name, questions_attributes: [:id, :content, :_delete])
end
更新:
Questions project must exist
允许 questions_attributes
中的 project_id
def project_params
params.require(:project).permit(:name, questions_attributes: [:id, :content, :project_id, :_delete])
end
或在关联上设置可选:true
class Question < ApplicationRecord
belongs_to :project, optional: true
end
关于ruby-on-rails - 无法在 Rails 5.1 中保存嵌套表单,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44774912/