rails 上 ruby 未显示两个参数的值

Question

当我打开浏览器时，显示 'name' 和 'location' 的值，但不显示为 'start' 和 'end' （日期）输入的值.这是我的“表演”html 和控制器的代码。

show.html.erb:

<p>
  <strong>Name:</strong>
  <%= @trip.name %>
</p>

<p>
 <strong>Location:</strong>
 <%= @trip.location %>
</p>

<p>
  <strong>Start Date:</strong>
  <%= @trip.start %>
</p>

<p>
  <strong>End Date:</strong>
  <%= @trip.end %>
</p>

trips_controller.rb:

class TripsController < ApplicationController
def show
    @trip = Trip.find(params[:id])
end

def new
end

def create
    #render plain: params[:trip].inspect
    @trip = Trip.new(trip_params)

    @trip.save
    redirect_to @trip
end

private
    def trip_params
        params.require(:trip).permit(:name, :location, :start, :end)
    end
end

trip.rb:

class Trip < ActiveRecord::Base
end

schema.rb:

ActiveRecord::Schema.define(version: 20151016023421) do
  create_table "trips", force: :cascade do |t|
    t.string   "location"
    t.string   "name"
    t.date     "start"
    t.date     "end"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer  "user_id"
  end
end

在我的 rails 控制台中：

2.2.3 :013 > Trip.first
  Trip Load (0.5ms)  SELECT  "trips".* FROM "trips"  ORDER BY "trips"."id"         ASC LIMIT 1
 => #<Trip id: 1, location: "we", name: "a", start: nil, end: nil,  created_at: "2015-10-21 03:17:45", updated_at: "2015-10-21 03:17:45", user_id:  nil>

2.2.3 :014 > Trip.create(name: 'test', location: 'test location', start:  '2015-10-21', end: '2015-10-27')
   (0.1ms)  begin transaction
  SQL (0.5ms)  INSERT INTO "trips" ("name", "location", "start", "end",    "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["name", "test"],   ["location", "test location"], ["start", "2015-10-21"], ["end", "2015-10-27"],  ["created_at", "2015-10-21 04:44:18.436966"], ["updated_at", "2015-10-21  04:44:18.436966"]]
   (22.7ms)  commit transaction
 => #<Trip id: 11, location: "test location", name: "test", start: "2015-10- 21", end: "2015-10-27", created_at: "2015-10-21 04:44:18", updated_at: "2015-10- 21 04:44:18", user_id: nil>

Answer 1

我认为你的 @trip.start 和 @trip.end 是 nil，这就是你在浏览器中看不到它的原因。尝试这样做以确认：

<p>
  <strong>Start Date:</strong>
  <%= @trip.start.inspect %>
</p>

<p>
  <strong>End Date:</strong>
  <%= @trip.end.inspect %>
</p>

看看它现在是否显示 nils 的价值。

如果该值存在，它将在浏览器中显示该值。

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