Add Comment to User and Post models Rails 4 - ruby-on-rails

Question

I have microposts that belong to artists, and everything with that works perfectly.
Now I'm trying to let artists comment on microposts. However, this isn't working how I want it. The comments need to belong to both a specific artist and a specific micropost.
Right now I have a form to create a comment, but it only saves under the most recent micropost id.
### controllers/artists/comments_controller.rb ###
class Artists::CommentsController < ApplicationController
def create
#micropost = ArtistMicropost.find_by(params[:micropost_id])
#comment = #micropost.artist_micropost_comments.build(comment_params)
#comment.artist_id = current_artist.id
end
private
def comment_params
params.require(:artist_micropost_comment).permit(:artist_micropost_id, :artist_id, :content)
end
end
### controllers/artists/artists_controller.rb ###
class Artists::ArtistsController < ApplicationController
def show
#artist = Artist.find(params[:id])
#micropost = ArtistMicropost.new
#micro = ArtistMicropost.find_by(params[:micropost_id])
#comment = ArtistMicropostComment.new
end
end
### views/artists/show.html.erb ###
<% #artist.artist_microposts.each do |micropost| %>
...
<%= micropost.content %>
...
<% #micro.artist_micropost_comments.each do |comment| %>
<%= comment.content %>
<% end %>
<%= form_for(#comment) do |f| %>
<%= f.text_area :content %>
<%= f.submit "post comment" %>
<% end %>
<% end %>
### models/artist.rb ###
class Artist < ActiveRecord::Base
has_many :artist_microposts, dependent: :destroy
has_many :artist_micropost_comments, dependent: :destroy
end
### models/artist_micropost.rb ###
class ArtistMicropost < ActiveRecord::Base
belongs_to :artist
has_many :artist_micropost_comments, dependent: :destroy
end
### models/artist_micropost_comment.rb ###
class ArtistMicropostComment < ActiveRecord::Base
belongs_to :artist_micropost
belongs_to :artist
end
I want it to display each micropost by the artist and underneath each micropost to display the comments that belong to the micropost. I the want the from to display under the comments to add new comments. Basically, I want it to look something like Facebook.
Right now, all the comments are displaying under each micropost no matter what the micropost_id and the create method won't create under any micropost_id, except the most recent one.
So my two problems are:
I can't get the comments to save under the correct micropost_id
I can't get the comments to loop for their micropost.
Any ideas?

Answer 1

Short names are easier to read and understand so I will rename your models in my example to Artist, Micropost and Comment
class Artist < ActiveRecord::Base
has_many :microposts, dependent: :destroy
has_many :comments, through: :microposts, dependent: :destroy
end
class Micropost < ActiveRecord::Base
belongs_to :artist
has_many :comments, dependent: :destroy
end
class Comment < ActiveRecord::Base
# I renamed artist to commenter to make it clear that is not the same artist as the one that created the micropost,
# this implies that instead of author_id you will have commented_id in comments table
belongs_to :commenter, :class_name => Artist
belongs_to :micropost
end
### views/artists/show.html.erb ###
<% #artist.microposts.each do |micropost| %>
...
<%= micropost.content %>
...
<% micropost.comments.each do |comment| %>
# here you display comments for each micropost
<%= comment.content %>
# pay attention at the way I builded the comment
<%= form_for(micropost.comments.build) do |f| %>
<%= f.hidden_field :micropost_id %> # this will make the link to your micropost
<%= f.text_area :content %>
<%= f.submit "post comment" %>
<% end %>
<% end %>
<% end %>
In your comments_controller you must assign current logged in artist (the commenter) to your comment.
class CommentsController < ApplicationController
def create
#comment = Comment.new(comment_params)
#comment.commenter = current_artist
if #comment.save
...
end
end
private
def comment_params
params.require(:comment).permit(:micropost_id, :content)
end
end
To avoid N+1 when you load artists, microposts and commenters do something like this:
class ArtistsController < ApplicationController
def show
#artist = Artist.includes(:microposts, :comments => :commenter).find(params[:id])
end
end

Answer 2

For Your requirement. For creation of microposts.
do something like this.
artist=Artist who is logged in
artist.artist_micro_posts.build(attributes)
artist.save
For creating comments to microposts
micro_posts= Micropost Id
micro_post.artist_micropost_comments.build(:artist_id=logged in person)
micro_post.save