我不能调用我的新变量，为什么不呢？

Question

I'm new in rails, so I do not master even the subtleties of this langage. I meet an error which say undefined method 'prix' for Online::ActiveRecord_Associations when I try to call my variable "prix" and "portion" into the post index. So I can I do that ?

My code :

Onlines controller :

 class OnlinesController < ApplicationController before_action :authenticate_user! before_action :set_post before_action :owned_online, only: [:new, :edit, :update] before_action :set_online def index @post = Post.all.order('created_at DESC') end def new @online = current_user.onlines.build @online.post_id = @post.id @online.user_id = current_user.id end def create @online = @post.onlines.create(online_params) @online.user_id = current_user.id @online.post_id = @post.id if @online.save(online_params) @online.update(push: true) @online.update(pushed_at: Time.zone.now) flash[:success] = 'Votre post est en ligne !' redirect_to post_path(@post) else render 'new' end end def show end def update if @onlines.update(online_params) if @online.push == false if @online.portion <= 1 @online.update(push: false) flash[:success] = 'Veuillez indiquer le nombre de parts disponibles ' redirect_to root_path else @online.update(push: true) flash[:success] = 'Votre post a bien été pushé !' redirect_to root_path end end else @user.errors.full_messages flash[:error] = @user.errors.full_messages render :edit end end private def online_params params.require(:online).permit(:user_id, :post_id, :prix, :portion, :push, :pushed_at) end def owned_online @post = Post.find(params[:post_id]) unless current_user == @post.user flash[:alert] = "That post doesn't belong to you!" redirect_to :back end end def set_post @post = Post.find_by(params[:post_id]) end def set_online @post = Post.find(params[:post_id]) @online = Online.find_by(params[:id]) end end

Onlines/Index view :

 <div class="title text-center"> <h1>Alors ? On mange quoi ?</h1> </div> <br> <%= render 'posts/post' %>

posts /post view :

 <div class="row"> <%-@posts.each do |post|%> <div class="post"> <div class="form-group text-center"> <h3> <%=post.title%></h3> </div> <p> Posted by : <%= link_to post.user.pseudo, profile_path(post.user.pseudo) %>, <%= time_ago_in_words(post.created_at) %> ago </p> **<p><%= post.onlines.prix %></p> <p><%= @online.portion %></p>** <div class="image text-center"> <div class="image-border"> <%= link_to (image_tag post.image.url(:medium), class:'img-responsive'), post_path(post)%> </div> </div> </div> <% end %> </div> </div> </div>

So, if you have any ideas, tell me please.

Answer 1

In your posts/post.html.erb

**<p><%= post.onlines.prix %></p>

You encountered the error undefined method 'prix' for Online::ActiveRecord_Associations because posts.onlines is a collection of one or more Online objects, and NOT a single Online record.

By this, I meant that the following values may differ (as an example):

post.onlines.first.prix
post.onlines.last.prix

If you want to select just the @online record for every specific post in your <%-@posts.each do |post|%> loop, then you could just do the following

posts/post.html.erb

...
**<p><%= @online.prix %></p>
<p><%= @online.portion %></p>**
...

Or if you want to show all prix values for each Online record in post.onlines , then you could do the following

posts/post.html.erb

...
<% post.onlines.each do |online| %>
  **<p><%= online.prix %></p>
<% end %>
<p><%= @online.portion %></p>
...