Adding Comments Section To Posts In Rails - ruby-on-rails

Question

I am trying to add a comments section to posts on my web applications but getting an error when saving the comment
I have been following a tutorial to add a comments section to my posts and have been modifying as I go to work with my app. I am still relatively new to rails and I am still learning. I understand what the error message is telling me, but I am unsure as to how to proceed
Comments Controller:
class CommentsController < ApplicationController
def create
#micropost = Micropost.find_by(id: params[:id])
#comment =
#micropost.comments.create(params[:comment].permit(:body))
end
end
Microposts Contoller:
class MicropostsController < ApplicationController
before_action :logged_in_user, :upvote, :downvote, only:
[:create, :destroy]
before_action :correct_user, :upvote, :downvote, only:
:destroy, allow_destroy: true
def create
#micropost = current_user.microposts.build(micropost_params)
#maximum_length = Micropost.validators_on( :content,
:headline).first.options[:maximum]
if #micropost.save
flash[:success] = "Article Posted"
redirect_to root_url
else
#feed_items = []
render 'articles/home'
end
end
def destroy
#micropost.destroy
flash[:success] = "Micropost deleted"
redirect_to request.referrer || current_user
end
def show
#micropost = Micropost.find(params[:id])
end
private
def micropost_params
params.require(:micropost).permit(:content, :headline)
end
def correct_user
#micropost = current_user.microposts.find_by(id: params[:id])
redirect_to root_url if #micropost.nil?
end
end
Comments Form being rendered on post:
<%= form_for([#micropost, #micropost.comments.build]) do |f| %>
<br>
<p>
<%= current_user.name %>
<%= f.text_area :body %>
</p>
<br>
<p>
<%= f.submit %>
</p>
<% end %>
Comments Model:
class Comment < ApplicationRecord
belongs_to :micropost
end
Microposts Model:
class Micropost < ApplicationRecord
acts_as_votable
has_many :comments
belongs_to :user
validates :user_id, presence: true
validates :headline, presence: true, length: { maximum: 200 }
validates :content, presence: true, length: { maximum: 5000 }
end
Tables:
create_table "comments", force: :cascade do |t|
t.string "name"
t.text "body"
t.bigint "microposts_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "micropost_id"
t.index ["microposts_id"], name:
"index_comments_on_microposts_id"
end
create_table "microposts", force: :cascade do |t|
t.text "content"
t.bigint "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.text "headline"
t.index ["user_id", "created_at"], name:
"index_microposts_on_user_id_and_created_at"
t.index ["user_id"], name: "index_microposts_on_user_id"
end
The form is being rendered on the micropost show view. I can see the form fine.
When I press to save the comment on the post I get an error stating undefined method comments for nil:NilClass and it highlights the Comments controller and the line #comment = #micropost.comments.create(params[:comment].permit(:body))
I know there probably should a method somewhere for comments. The tutorial I watched didn't add anything like that. So I unsure do I need to modify some existing code, or do I need to add a method somewhere called comments?

Answer 1

where is the form to create comments, you are not sending the parameter params [: id], and with this parameter you are looking for the # micropost .. you must send the id in that form, a quick solution could be
<% = f.hidden_field: id, value: # micropost.id%>
 
in the comment creation form

Answer 2

Okay so the answers you all gave pointed me in the right direction. I wasn't actually passing an proper id. Instead of #micropost = Micropost.find_by(id: params[:id]) it should have been #micropost = Micropost.find_by(id: params[:micropost_id])
Many thanks all for getting me there.