Question

我有一个可以创建新事件的web应用程序，ruby将它们绑定到一天。 所以我有一个belongs_to has_many关系

要创建新事件，我制作了自己的模板：

newform.html.erb

<% provide(:title, "Event Optionen") %>

<%= form_for(@event) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>

  <div class="field">
    <%= f.label :title, "Titel" %><br>
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :description, "Beschreibung" %><br>
    <%= f.text_area :description %>
  </div>
  <div class="field">
    <%= f.label :day_id, "Tag"%><br>
    <%= f.collection_select :day, @dates, :to_s, :to_s, include_blank: false %>
  </div>
  <div class="field_small">
    <%= f.label :start %><br>
    <%= f.time_select :start, :minute_step => 15 %>
  </div>
  <div class="field_small">
    <%= f.label :end, "Ende" %><br>
    <%= f.time_select :end, :minute_step => 15 %>
  </div>
  <div class="actions">
    <%= f.hidden_field :day_id, :value => :day%>
    <%= f.submit "Event erstellen", class: "btn btn-large btn-primary" %>
  </div>

<% end %>

events_controller.rb

class EventsController < ApplicationController
  include SessionsHelper
  before_action :set_event, only: [:show, :edit, :update, :destroy]
  before_filter :admin_authenticate

  def index
    @events = Event.all
  end

  def show
  end

  def new
    @event = Event.new
    lager  = Lager.find(params[:id])
    @dates = []
    for i in lager.start..lager.end
      @dates << i
    end

  end

  def edit
    @day = Day.find(params[:id]).date
  end

  def create
    event_params = params[:event]
    date         = Date.new event_params["start(1i)"].to_i, event_params["start(2i)"].to_i, event_params["start(3i)"].to_i
    start_time   = Time.new event_params["start(1i)"].to_i, event_params["start(2i)"].to_i, event_params["start(3i)"].to_i, event_params["start(4i)"].to_i, event_params["start(5i)"].to_i 
    end_time     = Time.new event_params["end(1i)"].to_i, event_params["end(2i)"].to_i, event_params["end(3i)"].to_i, event_params["end(4i)"].to_i, event_params["end(5i)"].to_i 
    title        = event_params[:title]
    description  = event_params[:description]
    day          = event_params[:day]
    day_id       = Day.find_by(date: "#{day}")

    @event = Event.new(start: start_time, end: end_time, title: title, description: description, day_id: day_id)

    respond_to do |format|
      if @event.save
        format.html { redirect_to root_path, notice: 'Event wurde erfolgreich erstellt.' }
        format.json { head :no_content }
      else
        format.html { render action: 'new' }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end



  end

  def update
    respond_to do |format|
      if @event.update(event_params)
        format.html { redirect_to @event, notice: 'Event was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end


  def destroy
    @event.destroy
    respond_to do |format|
      format.html { redirect_to events_url }
      format.json { head :no_content }
    end
  end

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

所以在创建此事件后，它应该重定向到root_path，否则渲染回 new.html.erb 。

每次出现此错误：/我不知道如何处理它。

NoMethodError in Events#create

Answer 1

我认为您收到错误是因为您未在方法@dates中设置create。我认为您使用无效参数发布了表单，@event无法保存，而您使用new呈现@dates。

Answer 2

问题是你正在为nil对象尝试map方法，所以试着找到对象。我想新的事件@dates值将是nil，所以注释行 <%= f.collection_select :day, @dates, :to_s, :to_s, include_blank: false %> 并重新加载页面。

RoR - 创建事件后的路由错误

2 个答案: