我正在物流公司上创建Web应用程序。我正确地创建了位置表。但我在其中一列中使用了“类型”。我意识到“类型”是Rails中的保留字，因此我做了一次迁移，将“类型”更改为“位置”表中的“ type_of_location”。
“位置”表被创建为支架。
因此，在应用程序中，我单击“新位置”并输入相关详细信息。该应用程序说成功保存，但是值丢失了。
我检查了数据库，除created_on和updated_at之外，其他值均为空。
我已经看过这里的各种文章，并且还重新加载了数据库。
_form.html.erb：
<%= form_for(@location) do |f| %>
<% if @location.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@location.errors.count, "error") %> prohibited this location from being saved:</h2>
<ul>
<% @location.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :type_of_location %><br><small>(Select "Warehouse", "Office", "Server building" or "Other")</small>
<%= f.text_field :type_of_location, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :address %><br>
<%= f.text_field :address, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :address2 %><br>
<%= f.text_field :address2, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :city %><br>
<%= f.text_field :city, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :postal_code %><br>
<%= f.text_field :postal_code, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :country %><br>
<%= f.text_field :country, :class => 'form-control' %>
</div>
<div class="field">
<%= f.label :reception_phone %><br>
<%= f.text_field :reception_phone, :class => 'form-control' %>
</div>
<div class="actions">
<%= f.submit 'Submit', :class => 'btn btn-success' %>
</div>
<% end %>
routes.rb：
...
resources :locations
resources :locations do
resources :departments
resources :employees
end
...
show.html.erb：
<p id="notice"><%= notice %></p>
<p>
<strong>Type of location:</strong>
<%= @location.type_of_location %>
</p>
<p>
<strong>Address:</strong>
<%= @location.address %>
</p>
<p>
<strong>Address2:</strong>
<%= @location.address2 %>
</p>
<p>
<strong>City:</strong>
<%= @location.city %>
</p>
<p>
<strong>Postal code:</strong>
<%= @location.postal_code %>
</p>
<p>
<strong>Country:</strong>
<%= @location.country %>
</p>
<p>
<strong>Reception phone:</strong>
<%= @location.reception_phone %>
</p>
<%= link_to 'Edit', edit_location_path(@location) %> |
<%= link_to 'Back', locations_path %>
location.rb在控制器/模型中：
class Location < ActiveRecord::Base
has_many :departments
has_many :employees
end
locations_controller.rb：
class LocationsController < ApplicationController
before_action :set_location, only: [:show, :edit, :update, :destroy]
# GET /locations
# GET /locations.json
def index
@locations = Location.all
end
# GET /locations/1
# GET /locations/1.json
def show
@location = Location.find(params[:id])
end
# GET /locations/new
def new
@location = Location.new
end
# GET /locations/1/edit
def edit
end
# POST /locations
# POST /locations.json
def create
@location = Location.create(location_params)
respond_to do |format|
if @location.save
format.html { redirect_to @location, notice: 'Location was successfully created.' }
format.json { render :show, status: :created, location: @location }
else
format.html { render :new }
format.json { render json: @location.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /locations/1
# PATCH/PUT /locations/1.json
def update
respond_to do |format|
if @location.update(location_params)
format.html { redirect_to @location, notice: 'Location was successfully updated.' }
format.json { render :show, status: :ok, location: @location }
else
format.html { render :edit }
format.json { render json: @location.errors, status: :unprocessable_entity }
end
end
end
# DELETE /locations/1
# DELETE /locations/1.json
def destroy
@location.destroy
respond_to do |format|
format.html { redirect_to locations_url, notice: 'Location was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_location
@location = Location.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def location_params
params.require(:location).permit(:type_of_location, :address, :address2, :city, :postal_code, :country, :reception_phone)
end
end
schema.rb：
...
create_table "locations", force: :cascade do |t|
t.string "type_of_location"
t.string "address"
t.string "address2"
t.string "city"
t.string "postal_code"
t.string "country"
t.string "reception_phone"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
...
[date]_create_locations.rb：
class CreateLocations < ActiveRecord::Migration
def change
create_table :locations do |t|
t.string :type
t.string :address
t.string :address2
t.string :city
t.string :postal_code
t.string :country
t.string :reception_phone
t.timestamps null: false
end
end
end
插入后的输出：
Started POST "/locations" for 193.1.209.157 at 2019-03-28 12:59:33 +0000
Cannot render console from 193.1.209.157! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
Processing by LocationsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"L/sFGam4dDoKQ5yQ1M95sUpCg6HW6MnQ3IzUFslfBUe4Udt11z14qXg/A/PCw1EaZq0vU/LN+Hb9eXO92w8lwQ==", "location"=>{"type_of_location"=>"Warehouse", "address"=>"57 O'Connell Street, Dublin", "address2"=>"Dublin", "city"=>"Dublin", "postal_code"=>"D01AB12", "country"=>"Ireland", "reception_phone"=>"+14516631"}, "commit"=>"Submit"}
User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
(0.2ms) begin transaction
SQL (0.4ms) INSERT INTO "locations" ("created_at", "updated_at") VALUES (?, ?) [["created_at", "2019-03-28 12:59:33.740960"], ["updated_at", "2019-03-28 12:59:33.740960"]]
(13.2ms) commit transaction
(0.1ms) begin transaction
(0.1ms) commit transaction
Redirected to https://a2z-ie-app-keithfeeneynci.c9users.io/locations/2
Completed 302 Found in 21ms (ActiveRecord: 14.2ms)
Started GET "/locations/2" for 193.1.209.157 at 2019-03-28 12:59:34 +0000
Cannot render console from 193.1.209.157! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
Processing by LocationsController#show as HTML
Parameters: {"id"=>"2"}
User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT 1 [["id", 1]]
Location Load (0.1ms) SELECT "locations".* FROM "locations" WHERE "locations"."id" = ? LIMIT 1 [["id", 2]]
Rendered locations/show.html.erb within layouts/application (1.2ms)
Rendered devise/menu/_registration_items.html.erb (0.2ms)
Rendered devise/menu/_login_items.html.erb (0.2ms)
Completed 200 OK in 34ms (Views: 31.7ms | ActiveRecord: 0.3ms)
答案 0 :(得分：0)
我无法解决此问题，因此我再次启动了我的项目。我确定“类型”为“ location_type”，并且可以正常工作。