Rails錯誤 - 應用程序未選取驗證和/或防錯代碼塊

Question

我正在構建一個事件應用程序，該應用程序在視圖中使用簡單窗體來創建事件。我試圖實施驗證，以便某些細節必須存在。當我測試了這個 - 通過故意丟失表單的各個部分 - 我遇到了大量的問題/錯誤/錯誤，拋出了。唯一重新恢復正常的方法是我刪除'有毒「的事件通過控制檯。

就好像視圖中的驗證和錯誤代碼塊沒有任何作用，事件仍在創建並分配了一個id，並且代碼剛剛打破，創建了一個bug，當我故意忽略表單的某些部分。

不知道爲什麼會發生這種情況。這是我的相關代碼 -

EventsController.rb

class EventsController < ApplicationController 
before_action :find_event, only: [:show, :edit, :update, :destroy,] 
# the before_actions will take care of finding the correct event for us 
# this ties in with the private method below 
before_action :authenticate_user!, except: [:index, :show] 
# this ensures only users who are signed in can alter an event 



def new 
    @event = current_user.events.build 
    # this now builds out from a user once devise gem is added 
    # after initially having an argument of Event.new 
    # this assigns events to users 
end 

def create 
    @event = current_user.events.build(event_params) 
    # as above this now assigns events to users 
    # rather than Event.new 

    if @event.save 
     redirect_to @event, notice: "Congratulations, you have successfully created a new event." 
    else 
     render 'new' 
    end 
end 

private 

def event_params 
    params.require(:event).permit(:title, :location, :date, :time, :description, :number_of_spaces, :is_free, :price, :organised_by, :url, :image, :category_id) 
    # category_id added at the end to ensure this is assigned to each new event created 
end 

def find_event 
    @event = Event.find(params[:id]) 
end 







end 

這是我的表單部分它有一個錯誤代碼塊 - 這個最初扔了一個錯誤，指出預計2

時正在傳遞0參數

_form.events.html.erb

<%= simple_form_for(@event) do |f| %> 
<% if @event.errors.any? %> 
    <h2><%= pluralize(@event.errors.count, "error") %> prevented this Event from saving:</h2> 
    <ul> 
     <% @event.errors.full_message.each do |message| %> 
     <li><%= message %></li> 
     <% end %> 
    </ul> 
<% end %> 

<%= f.collection_select :category_id, Category.all, :id, :name, {prompt: "Choose a category"} %> 
<!-- The above code loop assigns a category_id to each event --> 

<%= f.input :image, as: :file, label: 'Image' %> 
<%= f.input :title, label: 'Event Title' %> 
<label>Location</label><%= f.text_field :location, id: 'geocomplete' %></br> 
<label>Date</label><%= f.text_field :date, label: 'Date', id: 'datepicker' %> 
<%= f.input :time, label: 'Time' %> 
<%= f.input :description, label: 'Description' %> 
<label>Number of spaces available</label><%= f.text_field :number_of_spaces, label: 'Number of spaces' %> 
<%= f.input :is_free, label: 'Tick box if Event is free of charge' %> 
<!--f.input :currency, :collection => [['£GBP - British Pounds',1],['$USD - US Dollars',2],['€EUR - Euros',3]] --> 
<%= f.input :price, label: 'Cost per person (leave blank if free of charge)' %> 
<%= f.input :organised_by, label: 'Organised by' %> 
<%= f.input :url, label: "Link to Organiser site" %> 

<%= f.button :submit, label: 'Submit' %> 

<% end %> 

與驗證事件模型。無論是否包含驗證，都會發生錯誤（我已將它們取出並嘗試使用相同的結果）。

Event.rb

class Event < ActiveRecord::Base 

belongs_to :category 
belongs_to :user 
has_many :bookings 
has_many :comments 


has_attached_file :image, styles: { medium: "300x300>" } 
validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/ 

validates_associated :category 
validates :title, :description, :location, :date, :time, :number_of_spaces, :price_pennies, presence: true 


monetize :price_pennies 
# required for money-rails gem to function 

end 

的消息似乎在從「的ActionController :: InvalidAuthenticityToken」的地方，以「未定義的方法」的所有反彈一行的代碼在我的節目頁面錯誤 -

<p><%= @event.date.strftime('%A, %d %b %Y') %></p> 

當我試圖離開日期字段爲空。

在你看來

Answer 1

這裏是你的問題：

<%= simple_form_for(@event) do |f| %> 
<% if @event.errors.any? %> 
    <h2><%= pluralize(@event.errors.count, "error") %> prevented this Event from saving:</h2> 
    <ul> 
     <% @event.errors.full_message.each do |message| %> 
     <li><%= message %></li> 
     <% end %> 
    </ul> 
<% end %> 

具體而言，本部分：

<% @event.errors.full_message.each do |message| %> 

在縮放：

@event.errors.full_message 

你忘了一個 「s」 結尾的方法名稱，它應該是：

@event.errors.full_messages 

full_message方法需要2個參數，用於返回給定屬性的單個完整錯誤消息。這個錯字給你錯誤。

http://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-full_message