私の最初の Rails プログラム (ruby 2.0、rails 4.0) はまだ進行中です。2 番目のモデルの静的オプションを表示するドロップ ダウンがありますが、そのドロップ ダウンからの選択をクリックしても何も起こりません。それをレコードに保存すると (presence_of 検証がオフになります)、フィールドが空のままになります。
コントローラーまたはビューで何かを考えていますか?何か助けはありますか?
大規模なコード ダンプで申し訳ありません。
お問い合わせ.rb
class Contact < ActiveRecord::Base
attr_accessible :first_name, :last_name, :email, :zip_code, :favorite_color, :color_id, :name, :hex
belongs_to :color
accepts_nested_attributes_for :color
カラー.rb
class Color < ActiveRecord::Base
has_many :contacts
accepts_nested_attributes_for :contacts
attr_accessible :name, :hex
end
contact_controller.rb
class ContactsController < ApplicationController
before_action :set_contact, only: [:show, :edit, :update, :destroy]
before_filter :prepare_colors
# GET /contacts
# GET /contacts.json
def index
@contacts = Contact.all
end
# GET /contacts/1
# GET /contacts/1.json
def show
end
# GET /contacts/new
def new
@contact = Contact.new
end
# GET /contacts/1/edit
def edit
end
# POST /contacts
# POST /contacts.json
def create
@contact = Contact.new(contact_params)
respond_to do |format|
if @contact.save
format.html { redirect_to @contact, notice: 'Contact was successfully created.' }
format.json { render action: 'show', status: :created, location: @contact }
else
format.html { render action: 'new' }
format.json { render json: @contact.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /contacts/1
# PATCH/PUT /contacts/1.json
def update
respond_to do |format|
if @contact.update(contact_params)
format.html { redirect_to @contact, notice: 'Contact was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @contact.errors, status: :unprocessable_entity }
end
end
end
# DELETE /contacts/1
# DELETE /contacts/1.json
def destroy
@contact.destroy
respond_to do |format|
format.html { redirect_to contacts_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_contact
@contact = Contact.find(params[:id])
end
def prepare_colors
@colors = Color.all
end
# Never trust parameters from the scary internet, only allow the white list through.
def contact_params
params.require(:contact).permit(:first_name, :last_name, :email, :zip_code, :favorite_color, :color_id)
end
終わり
ビュー/連絡先/_form.html.erb
%= form_for(@contact) do |f| %>
<% if @contact.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@contact.errors.count, "error") %> prohibited this contact from being saved:</h2>
<ul>
<% @contact.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :first_name %><br>
<%= f.text_field :first_name %>
</div>
<div class="field">
<%= f.label :last_name %><br>
<%= f.text_field :last_name %>
</div>
<div class="field">
<%= f.label :email %><br>
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :zip_code %><br>
<%= f.number_field :zip_code %>
</div>
<div class="field">
<%= f.label :favorite_color %><br>
<%= f.collection_select(:color_id, @colors, :id, :name, :include_blank => "Please select") %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
および /views/contacts/index.html
h3>Listing contacts</h1>
<table>
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
<th>Email</th>
<th>Zip code</th>
<th>Favorite color</th>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<% @contacts.each do |contact| %>
<tr>
<td><%= contact.first_name %></td>
<td><%= contact.last_name %></td>
<td><%= contact.email %></td>
<td><%= contact.zip_code %></td>
<td><%= contact.favorite_color %></td>
<td><%= link_to 'Show', contact %></td>
<td><%= link_to 'Edit', edit_contact_path(contact) %></td>
<td><%= link_to 'Destroy', contact, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</tbody>
</table>
<br>
<%= link_to 'New Contact', new_contact_path %>