rails undefined method `reviewer' for #<Review - ruby-on-rails

Question

I'm creating review to my posts, all works but i dont know how to show who wrote the review
i'm trying this:
class User < ActiveRecord::Base
has_many :posts
has_many :reviewers, :class_name => 'Post', :foreign_key => 'reviewer_id'
end
class Post < ActiveRecord::Base
belongs_to :user
belongs_to :category
has_many :reviews
belongs_to :reviewers, class_name: 'User', :foreign_key => 'reviewer_id'
default_scope -> { order('created_at DESC') }
end
class Review < ActiveRecord::Base
belongs_to :post
belongs_to :user
end
class ReviewsController < ApplicationController
def new
#post = Post.find(params[:post_id])
#review = #post.reviews.new(post_id:params[:post_id])
end
def create
#post = Post.find(params[:post_id])
#review = #post.reviews.build(review_params)
if #review.save
flash[:success] = "Ваш отзыв добавлен"
redirect_to post_path #post
else
render 'new'
end
end
private
def review_params
params.require(:review).permit(:post_id, :body, :reviewer_id).merge(:reviewer_id => current_user.id)
end
end
and my view
<% #post.reviews.each do |review| %>
<p>
<strong>reviewer:</strong>
<%= review.reviewer.email %>
</p>
<p>
<strong>review:</strong>
<%= review.body %>
</p>
<% end %>
my migration
class CreateReviews < ActiveRecord::Migration
def change
create_table :reviews do |t|
t.text :body
t.references :post, index: true
t.references :reviewer, index: true
t.timestamps
end
end
end
but rails given error undefined method `reviewer' for #
Help please dsfsdf

Answer 1

I think that you have a pluralization issue:
A post have many reviews by many reviewers (one for each review). But you are storing the foreign key within the post so you written the problematic line:
belongs_to :reviewers, class_name: 'User', :foreign_key => 'reviewer_id'
The issue here is that it is a singular association with a plural name.
I think that you are trying to say here that a
class Post
have_many :reviewers, class_name: 'User', through: :reviews
end
But as you are trying to access the reviewers from the review what you really need is to add:
class Review
belongs_to :reviewer, class_name: 'User'
end
Then you can access the reviewers from the review as expected:
<% #post.reviews.each do |review| %>
<p>
<strong>reviewer:</strong>
<%= review.reviewer.email %>
</p>
<p>
<strong>review:</strong>
<%= review.body %>
</p>
<% end %>
There is also an error in User:
has_many :reviewers, :class_name => 'Post', :foreign_key => 'reviewer_id'
As it should be:
has_many :reviews, :foreign_key => 'reviewer_id'

Answer 2

You need to be using .user. Check the belongs_to in your model.
Review.first.user

Answer 3

As a previous poster pointed out, your user association for Review is :user, so your view should probably look like this:
<% #post.reviews.each do |review| %>
<p>
<strong>reviewer:</strong>
<%= review.user.name unless review.user.nil? %>
</p>
<p>
<strong>review:</strong>
<%= review.body %>
</p>
<% end %>