[英]undefined method `events' for nil:NilClass
我正在使用嵌套屬性,在提交信息並收到此錯誤之前,一切似乎都還不錯。 它說它在我的EventsController文件中:
class EventsController < ApplicationController
def new
@event = Event.new
@event.songs.build
end
def index
@songs = Song.all
end
def show
@event = Event.find(params[:id])
@songs = @event.songs.paginate(page: params[:page])
end
def create
@event = current_user.events.build(event_params)
if @event.save
flash[:success] = "Event Created!"
redirect_to user_path(@event.user)
else
render 'welcome#index'
end
end
def destroy
end
private
def event_params
params.require(:event).permit(:name, :partycode, song_attributes: [:event_id, :artist, :title, :genre, :partycode])
end
end
這是我的歌曲視圖中的new.html.erb文件(根據選定事件處理歌曲提交)
<br>
<br>
<div class ="container">
<div class="jumbotron">
<%= form_for Event.new do |f| %>
<h3>Enter a song:</h3>
<%= f.fields_for :songs, Song.new do |song_form| %>
<%= song_form.collection_select(:event_id, Event.all, :id, :name) %>
<%= song_form.text_field :artist, placeholder: "Artist" %>
<%= song_form.text_field :title, placeholder: "Title" %>
<%= song_form.text_field :genre, placeholder: "Genre" %>
<% end %>
<%= link_to_add_fields "Add Song", f, :songs %>
<%= f.text_field :partycode %>
<%= f.submit "Submit", class: "btn btn-primary" %>
<% end %>
</div>
</div>
在我的ApplicationHelper.rb文件中定義了link_to_add_fields方法:
module ApplicationHelper
def link_to_add_fields(name, f, association)
new_object = f.object.send(association).klass.new
id = new_object.object_id
fields = f.fields_for(association, new_object, child_index: id) do |builder|
render("songs_fields", f: builder)
end
link_to(name, '#', class: "add_fields", data: {id: id, fields: fields.gsub("\n", "")})
end
end
在session_helper.rb文件中定義了current_user:
module SessionsHelper
# Logs in the given user.
def log_in(user)
session[:user_id] = user.id
end
def createEvent(event)
session[:event_id] = event.id
end
# Returns the current logged-in user (if any).
def current_user
@current_user ||= User.find_by(id: session[:user_id])
end
# Returns true if the user is logged in, false otherwise.
def logged_in?
!current_user.nil?
end
def log_out
session.delete(:user_id)
@current_user = nil
end
end
最后,這是我的songs_fields文件,僅當用戶點擊顯示“添加歌曲”的鏈接時,該文件才會生成字段
<fieldset>
<%= f.text_field :artist, placeholder: "Artist" %>
<%= f.text_field :title, placeholder: "Title" %>
<%= f.text_field :genre, placeholder: "Genre" %>
</fieldset>
我覺得這是我在應用程序中正常工作之前的最后一部分! 因此,對此的幫助將是巨大的:D
您回答了自己的問題...如果您尚未登錄,則current_user將為nil,因此會出現此錯誤。
選項1(丑):改變你的邏輯,所以current_user.events如果CURRENT_USER是零不會被調用,而只是直接去渲染
選項2(更好):在運行操作之前,使用before_action語句強制設置current_user 。 取決於您用來進行身份驗證的內容,但是使用Devise時,它看起來像這樣:
class EventsController < ApplicationController
before_action :authenticate_user!
我想也許是:
class EventsController < ApplicationController
before_action :log_in(user)
可能會為您做。
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