[ActiveRecord::RecordInvalid - Validation failed: Blog must exist]

[linardzb]

Hi,

trying to sort out this error for a while now, no luck.

I get this error above when adding a new comment for a blogpost. The blog is clearly there. Any insight would be much appreciated.

_comment.html.erb

<div class="comment-card">
    <div class="card">
        <div class="card-block">
            <div class="row">
                <div class="col-md-1">
                </div>
                <div class="col-md-11">
                    <%= comment.content %>
                </div>
            </div>
        </div>
    </div>
</div>

_comment_form.html.erb

<% unless current_user.is_a? GuestUser %>
  <%= form_for @comment, url: '#' do |f| %>
    <div class="form-group">
      <%= f.label :content %>
      <%= f.text_area :content, class: 'form-control' %>
    </div>
    <%= f.submit 'Post Comment', class: 'btn btn-primary' %>
  <% end %>
<% end %>

comment.rb

class Comment < ApplicationRecord
  belongs_to :user
  belongs_to :blog
  validates :content, presence: true, length: { minimum: 5, maximimum: 1000 }
  after_create_commit { CommentBroadcastJob.perform_later(self) }
end

comment_controller.rb

class CommentsController < ApplicationController
  def create
    @comment = current_user.comments.build(comment_params)
  end
  private
  def comment_params
    params.require(:comment).permit(:content)
  end
end

blogs_controller.rb

 def show
    @blog = Blog.includes(:comments).friendly.find(params[:id])
    @comment = Comment.new
    @page_title = @blog.title
    @seo_keywords = @blog.body
 end

blogs_channel.rb

class BlogsChannel < ApplicationCable::Channel
  def subscribed
    stream_from "blogs_#{params['blog_id']}_channel"
  end
  def unsubscribed
  end
  def send_comment(data)
    current_user.comments.create!(content: data['comment'], blog_id: data['blog_id'])
  end
end

blogs_controller.rb

def show
   @blog = Blog.includes(:comments).friendly.find(params[:id])
   @comment = Comment.new
end

show.html.erb

<div class="col-sm-8 blog-main">
    <h2> <%= @blog.title %></h2>
    <%= link_to 'Edit', edit_blog_path(@blog) if logged_in?(:site_admin) %>
    <p><%= @blog.body %></p>

    <%= render 'comments/comment_form' %>

    <div id="comments" data-blog-id="<%= @blog_id %>">
        <%= render @blog.comments %>
    </div>
</div>

I can create the comment in terminal:

[2] pry(main)> Comment.create!(user_id: User.last.id, blog_id: Blog.last.id, content: "1234567")
  User Load (0.4ms)  SELECT  "users".* FROM "users" ORDER BY "users"."id" DESC LIMIT $1  [["LIMIT", 1]]
  Blog Load (0.2ms)  SELECT  "blogs".* FROM "blogs" ORDER BY "blogs"."id" DESC LIMIT $1  [["LIMIT", 1]]
   (0.1ms)  BEGIN
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  Blog Load (0.1ms)  SELECT  "blogs".* FROM "blogs" WHERE "blogs"."id" = $1 LIMIT $2  [["id", 20], ["LIMIT", 1]]
  SQL (54.8ms)  INSERT INTO "comments" ("content", "user_id", "blog_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["content", "1234567"], ["user_id", 1], ["blog_id", 20], ["created_at", "2018-02-02 05:45:37.058157"], ["updated_at", "2018-02-02 05:45:37.058157"]]
   (9.1ms)  COMMIT
Enqueued CommentBroadcastJob (Job ID: 22604b93-a864-4213-a348-0e0da6c69ee0) to Async(default) with arguments: #<GlobalID:0x007f93f1e3cfb0 @uri=#<URI::GID gid://web-portfolio/Comment/7>>
=> #<Comment:0x007f93f52996f0
 id: 7,
 content: "1234567",
 user_id: 1,
 blog_id: 20,
 created_at: Fri, 02 Feb 2018 05:45:37 UTC +00:00,
 updated_at: Fri, 02 Feb 2018 05:45:37 UTC +00:00>
[3] pry(main)>   Comment Load (0.4ms)  SELECT  "comments".* FROM "comments" WHERE "comments"."id" = $1 LIMIT $2  [["id", 7], ["LIMIT", 1]]
Performing CommentBroadcastJob (Job ID: 22604b93-a864-4213-a348-0e0da6c69ee0) from Async(default) with arguments: #<GlobalID:0x007f93f0fd68b8 @uri=#<URI::GID gid://web-portfolio/Comment/7>>
  Blog Load (0.3ms)  SELECT  "blogs".* FROM "blogs" WHERE "blogs"."id" = $1 LIMIT $2  [["id", 20], ["LIMIT", 1]]
  Rendered comments/_comment.html.erb (1.7ms)
[ActionCable] Broadcasting to blogs_20_channel: {:comment=>"\t<div class=\"comment-card\">\n\t\t<div class=\"card\">\n\t\t\t<div class=\"card-block\">\n\t\t\t\t<div class=\"row\">\n\t\t\t\t\t<div class=\"col-md-1\">\n\t\t\t\t\t</div>\n\n\t\t\t\t\t<div class=\"col-md-11\">\n\t\t\t\t\t\t1234567\n\t\t\t\t\t</div>\n\t\t\t\t</div>\n\t\t\t</div>\n\t\t</div>\n\t</div>"}
Performed CommentBroadcastJob (Job ID: 22604b93-a864-4213-a348-0e0da6c69ee0) from Async(default) in 424.54ms

Terminal output when adding comment in browser:

Could not execute command from ({"command"=>"message", "identifier"=>"{\"channel\":\"BlogsChannel\",\"blog_id\":\"\"}", "data"=>"{\"comment\":\"sdgergre\",\"blog_id\":\"\",\"action\":\"send_comment\"}"}) [ActiveRecord::RecordInvalid - Validation failed: Blog must exist]: