I'm getting the above error in my Rails app when attempting to implement the edit function to a Comments MVC process.
This is the views code where the error is arising -
_comments.html.erb
<% if user_signed_in? %>
<p><%= link_to "Edit", edit_event_comment_path(#event, comment), remote: true %></p>
<p><%= link_to 'Delete', [comment.event, comment],
method: :delete,
class: "button",
data: { confirm: 'Are you sure?' } %></p>
<% end %>
This is the comments controller code -
Comments_controller.rb
class CommentsController < ApplicationController
before_action :set_comment, only: [:show, :edit, :update, :destroy]
def create
#event = Event.find(params[:event_id])
#comment = #event.comments.create!(params[:comment].permit(:name, :body))
#comment.user_id = current_user.id
redirect_to #event
end
# GET /comments/1/edit
def edit
respond_to do |f|
f.js
f.html
end
end
def update
respond_to do |format|
if #comment.update
format.html { redirect_to #comment, notice: 'Comment was successfully updated.' }
format.js { }
format.json { render :show, status: :created, location: #comment }
else
format.html { render :new }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
def destroy
#event = Event.find(params[:event_id])
#comment = #event.comments.find(params[:id])
#comment.destroy
redirect_to event_path(#event)
end
private
# Use callbacks to share common setup or constraints between actions.
def set_comment
#comment = Comment.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def comment_params
params.require(:comment).permit(:event_id, :body)
end
end
Here are my routes -
I have comments set up as a nested route for events so the route path is correct. I've tried a few different variations on this as trial and error but I'm still getting errors. I'm sure the answer is staring me in the face but I need help from a different set of eyes. Any assistance appreciated.
According to your code, if you are not looping #comments,
comment should be #comment
<% if user_signed_in? %>
<p><%= link_to "Edit", edit_event_comment_path(#event, #comment), remote: true %></p>
<p><%= link_to 'Delete', [#comment.event, #comment],
method: :delete,
class: "button",
data: { confirm: 'Are you sure?' } %></p>
<% end %>
Also, change your edit action to,
def edit
#event = #comment.event
respond_to do |f|
f.js
f.html
end
end
Related
I've been trying to build a facebook/blog type app where comments show directly under new posts, and you can also POST a new comment by rendering a form directly under the corresponding Post. As you'll learn in the rest of my post, I'm fairly new to Rails so any resources that directly help me understand the issue I'm having (even if it's just pointing me to the right parts of the Rails docs) would be super helpful.
As of right now, my homepage renders the post#index action, as well as a a post form so that you can create new posts directly on the index page. All of this works fine until I try to render my comment form. As a note, I'm only focusing on creating a new comment before implementing editing and deleting (not that that should affect anything I wouldn't think).
Unfortunately I keep getting this error -
Moreover, when I split each of these pages into a more traditional, link_to XXXX_path style where every form and action is on its own url page, everything works fine. I think there might be something fundamental that I'm just not understanding. So, before showing my code I'll just give a quick explanation of my understanding of how I expect things to work in my app
On the index.html.erb view:
Render the index page
Show each individual post and any corresponding info I want to display with my each method.
pass the specific instance of Post using <%= render 'comment_form', :post => post %>. This should also give me access to all of the params of said instance of post in my _comment_form.html.erb partial.
On the _comment_form.html.erb partial:
add model: [post, #comment] (as my comment controller is nested in post) so that Rails knows to build a new comment with the associated post instance that was pushed through my index view.
At the end of the day, if I had to guess, my issue is with my controllers - I feel like I've put the correct code in the methods/actions, but my hunch is that there's something conflicting between the #post instance variable and the post instance being iterated over in my each method. I'm really not sure what the problem is and any help would be much appreciated. I hope I didn't over (or under) explain my problem. Thanks for the help in advance!
views/posts/index.html.erb
<p id="notice"><%= notice %></p>
<nav>
</nav>
<h1>Posts</h1>
<table>
<thead>
<tr>
<th>User</th>
<th>Body</th>
<th colspan="3"></th>
</tr>
</thead>
<%= render 'form' %>
<tbody>
<% #posts.each do |post| %>
<tr>
<td><%= link_to post.user.email, user_path(post.user_id) %></td>
<td><%= post.body %></td>
<td><%= link_to 'Show', post %></td>
<td><%= link_to 'Edit', edit_post_path(post) %></td>
<td><%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %></td>
<td>
</tr>
<tr>
<%= render 'comment_form', :post => post %>
</tr>
<% end %>
</tbody>
</table>
<br>
<%= link_to 'New Post', new_post_path %>
views/posts/_comment_form.html.erb
<% if user_signed_in? %>
<%= form_with(model: [post, #comment], url: post_comments_path, method: "post", local: true) do |form| %>
<div class="field">
<%= form.label :body %>
<%= form.text_area :body %>
</div>
<div class="actions">
<%= form.submit %>
</div>
<% end %>
<% else %>
Please sign in to comment on the post!
<% end %>
posts_controller.rb
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
#before_action :authenticate_user!
# GET /posts
# GET /posts.json
def index
#posts = Post.all.order("created_at DESC")
#post = post_exists?
end
# GET /posts/1
# GET /posts/1.json
def show
end
# GET /posts/new
def new
#post = current_user.posts.build
end
# GET /posts/1/edit
def edit
end
# POST /posts
# POST /posts.json
def create
#post = current_user.posts.build(post_params)
respond_to do |format|
if #post.save
format.html { redirect_to index, notice: 'Post was successfully created.' }
format.json { render :show, status: :created, location: #post }
else
format.html { render :new }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
respond_to do |format|
if #post.update(post_params)
format.html { redirect_to #post, notice: 'Post was successfully updated.' }
format.json { render :show, status: :ok, location: #post }
else
format.html { render :edit }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post.destroy
respond_to do |format|
format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = Post.find(params[:id])
end
# Only allow a list of trusted parameters through.
def post_params
params.require(:post).permit(:body)
end
def post_exists?
current_user.posts.build if current_user != nil
end
end
comments_controller.rb
class CommentsController < ApplicationController
def new
#post = Post.find(params[:post_id])
#comment = #post.comments.build
end
def create
#post = Post.find(params[:post_id])
#comment = #post.comments.build(comments_params)
#comment.user_id = current_user.id
respond_to do |format|
if #comment.save
format.html { redirect_to posts_path, notice: 'Post was successfully created.' }
format.json { render :show, status: :created, location: #comment }
else
format.html { render :new }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
def destroy
end
private
def comments_params
params.require(:comment).permit(:body)
end
end
routes.rb
devise_for :users, controllers: {
sessions: 'users/sessions'
}
devise_scope :user do
get '/users/sign_out' => 'devise/sessions#destroy'
end
resources :posts do
resources :comments, only: [:new, :create, :destroy]
end
resources :users
root to: 'posts#index'
Models
>user.rb
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :validatable
has_many :posts, dependent: :destroy
has_many :comments, dependent: :destroy
>post.rb
belongs_to :user
has_many :comments, dependent: :destroy
>comment.rb
belongs_to :user
belongs_to :post
The error is saying that it is missing the post_id on line 2 in your comment_form.
You got:
<%= form_with(model: [post, #comment], url: post_comments_path, method: "post", local: true) do |form| %>
The url is set to post_comments_path but it doesn't knows which post so you need to pass the post to it as an argument like so:
<%= form_with(model: [post, #comment], url: post_comments_path(post), method: "post", local: true) do |form| %>
Although this will probably solve the current error, you will hit another error since you also got #comment in the comment_form and in your posts#index you don't declare #comment. You also can't declare #comment because it is depending on the post. You could try to solve that with:
<%= form_with(model: [post, post.comments.new], url: post_comments_path, method: "post", local: true) do |form| %>
so i'm getting this error when I press my rsvp button from my ui. Maybe theres something wrong with my route or something wrong with my controller.
I'm not too sure at this point. I'm quite new to rails and I've been stuck on this issue for far too long. When I do make some changes another error pops up. I would truly appreciate some help
class RsvpController < ApplicationController
def create
rsvp = current_user.rsvp.build({post_id: params[:id]})
if rsvp.save
end
end
end
post controller
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
# GET /posts
# GET /posts.json
def index
#posts = Post.all
end
# GET /posts/1
# GET /posts/1.json
def show
#post = Post.find(params[:id])
end
# GET /posts/new
def new
#post = Post.new
end
# GET /posts/1/edit
def edit
unless current_user == #post.user
redirect_back fallback_location: root_path, notice: 'User is not owner'
end
end
# POST /posts
# POST /posts.json
def create
#post = Post.new(post_params)
respond_to do |format|
if #post.save
format.html { redirect_to #post, notice: 'Post was successfully created.' }
format.json { render :show, status: :created, location: #post }
else
format.html { render :new }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
respond_to do |format|
if #post.update(post_params)
format.html { redirect_to #post, notice: 'Post was successfully updated.' }
format.json { render :show, status: :ok, location: #post }
else
format.html { render :edit }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post.destroy
respond_to do |format|
format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = Post.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def post_params
params.require(:post).permit(:date, :user_id, :description, :name, :address)
end
load_and_authorize_resource
def create
#rsvp=rsvp.new
end
end
=
routes.rb
Rails.application.routes.draw do
mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
resources :posts
devise_for :users
root 'home#index'
get 'home/ruby_meetup'
resources :posts do
post 'rsvp', to: 'rsvps#create', on: :member
end
Also I want the number of users who rsvped/registered to show up but I'm getting random numbers and letters showing up on my ui. Is there something not right with my show page?
show.html.erb
<p id="notice"><%= notice %></p>
<p>
<strong>Date:</strong>
<%= #post.date %>
</p>
<p>
<strong>Name:</strong>
<%= #post.name %>
</p>
<p>
<strong>User_id:</strong>
<%= #post.user_id %>
</p>
<p><strong>Address:</strong> <%= #post.address %></p>
<p>
<strong>Description:</strong>
<%= #post.description %>
</p>
<p>
<strong>registered:</strong>
<%=#post.user %>
</p>
<% if current_user == #post.user %>
<%= link_to 'Edit', edit_post_path(#post) %> |
<%end%>
<%= link_to 'Back', posts_path %>
<div class="rsvp"><%= button_to "Rsvp now", rsvp_post_path(#post), class: "btn btn-primary" %></div>
<div class="map"><%= image_tag "http://maps.googleapis.com/maps/api/staticmap?center=#{#post.latitude},#{#post.longitude}&markers=#{#post.latitude},#{#post.longitude}&zoom=12&size=450x400&key=AIzaSyCKzKMEhSNgwSXf7WV71pHWgzdpMkPn8W4",
class: 'img-fluid img-rounded', alt: "#{#post} on the map"%>
</div>
controller class name should be RsvpsController currently its RsvpController, note that s is missing after Rsvp.
Change your route to this:
post 'rsvp', to: 'rsvp#create', on: :member
i got a little annoying problem.
i use this line of code on my homepage and it works, but on my posts/index page it doesn't work.
<%= link_to post.title, user_post_path(post.user.user_name, post), class:"post-listing-home-title" %>
Ultimately i want to render all posts from users on the post index page, linking to their post assosicated like this
localhost:3000/users/user_name/posts/"name of the post"
here is my error
Showing /Users/****/rorapps/*****/app/views/posts/index.html.erb where line #10 raised:
No route matches {:action=>"show", :controller=>"posts", :id=>"eli-the-great", :user_id=>nil} missing required keys: [:user_id]
here is my code
Posts controller
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
# GET /posts
# GET /posts.json
def index
#posts = Post.all.order("created_at desc")
end
# GET /posts/1
# GET /posts/1.json
def show
end
# GET /posts/new
def new
#post = current_user.posts.build
end
# GET /posts/1/edit
def edit
end
# POST /posts
# POST /posts.json
def create
#post = current_user.posts.build(post_params)
respond_to do |format|
if #post.save
flash[:notice] = "Post successfully created"
format.html { redirect_to #post }
format.json { render :show, status: :created, location: #post }
else
format.html { render :new }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
respond_to do |format|
if #post.update(post_params)
flash[:notice] = "Post successfully created"
format.html { redirect_to #post }
format.json { render :show, status: :ok, location: #post }
else
format.html { render :edit }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = Post.friendly.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def post_params
params.require(:post).permit(:title, :content,:slug, :metadescription, :focuskeyword)
end
end
posts/index.html.erb
<p id="notice"><%= notice %></p>
<h1 class="post-listing">Listing Posts</h1>
<% #posts.each do |post| %>
<p class="date"><%= post.created_at.strftime('%A, %B %d') %></p>
<%= link_to post.title, user_post_path(post.user.user_name, post), class:"post-listing-title" %>
<td><%= link_to 'Show', post %></td>
<td><%= link_to 'Edit', edit_post_path(post) %></td>
<td><%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %></td>
<% end %>
welcome.html.erb again this is where the line of code works
<div class="container">
<% #posts.each do |post| %>
<div class="featured-post fadeInBlock animated">
<p class="date"><%= post.created_at.strftime('%A, %B %d') %></p>
<span class="show-right"><%= link_to '', user_post_path(:user_id, post), class:"myright fa fa-chevron-right" %></span>
<%= link_to post.title, user_post_path(post.user.user_name, post), class:"post-listing-home-title" %>
<% if user_signed_in? %>
<td><%= link_to 'Edit', edit_user_post_path(:user_id,post) %></td>
<td><%= link_to 'Destroy', user_post_path(:user_id, post), method: :delete, data: { confirm: 'Are you sure?' } %></td>
<% end %>
</div>
<% end %>
<div id="about-home">
<div id="about-box">
<h1 id="abouttext">Try Harder !</h1>
</div>
</div>
Thank you everyone for your help
The problem is with this line
<%= link_to post.title, user_post_path(post.user.user_name, post), class:"post-listing-title" %>
You are render these links inside a loop
<% #posts.each do |post| %>
So its seems like one of your post author doesn't has user_name.
I have a class called "questions", which is similar to an article, and each of them can have comments. Now the problem is, that I want to show multiple questions on the index page and all displaying the comments of the specific question as well as a small little form to leave a comment, which should be added to its question. Basically I have added the form and done everything, apart from figuring out how to get the question id and pass it to the comment.
I have made a little screenshot as well: http://prntscr.com/2pjk0i
questions_controller.rb
class QuestionsController < ApplicationController
before_action :set_question, only: [:show, :edit, :update, :destroy]
# GET /questions
# GET /questions.json
def index
#current_user ||= User.find_by_id(session[:user_id])
#questions = Question.all
end
# GET /questions/1
# GET /questions/1.json
def show
end
# GET /questions/new
def new
#question = Question.new
end
# GET /questions/1/edit
def edit
end
# POST /questions
# POST /questions.json
def create
#question = Question.new(question_params)
#current_user ||= User.find_by_id(session[:user_id])
#question.update(:user_id => #current_user.id)
respond_to do |format|
if #question.save
format.html { redirect_to #question, notice: 'Question was successfully created.' }
format.json { render action: 'show', status: :created, location: #question }
else
format.html { render action: 'new' }
format.json { render json: #question.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /questions/1
# PATCH/PUT /questions/1.json
def update
respond_to do |format|
if #question.update(question_params)
format.html { redirect_to #question, notice: 'Question was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #question.errors, status: :unprocessable_entity }
end
end
end
# DELETE /questions/1
# DELETE /questions/1.json
def destroy
#question.destroy
respond_to do |format|
format.html { redirect_to questions_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_question
#question = Question.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def question_params
params.require(:question).permit(:title, :body)
end
end
comments_controller.rb
class CommentsController < ApplicationController
before_action :set_comment, only: [:show, :edit, :update, :destroy]
# GET /comments
# GET /comments.json
def index
#current_user ||= User.find_by_id(session[:user_id])
#comments = Comment.all
end
# GET /comments/1
# GET /comments/1.json
def show
end
# GET /comments/new
def new
#comment = Comment.new
end
# GET /comments/1/edit
def edit
end
# POST /comments
# POST /comments.json
def create
#comment = Comment.new(comment_params)
#current_user ||= User.find_by_id(session[:user_id])
#comment.update(:user_id => #current_user.id, :question_id => ?) # What to add here to get the specific question id?
respond_to do |format|
if #comment.save
format.html { redirect_to '/', notice: 'comment was successfully created.' }
format.json { render action: 'show', status: :created, location: #comment }
else
format.html { render action: 'new' }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /comments/1
# PATCH/PUT /comments/1.json
def update
respond_to do |format|
if #comment.update(comment_params)
format.html { redirect_to '', notice: 'comment was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #comment.errors, status: :unprocessable_entity }
end
end
end
# DELETE /comments/1
# DELETE /comments/1.json
def destroy
#comment.destroy
respond_to do |format|
format.html { redirect_to '' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_comment
#comment = Comment.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def comment_params
params.require(:comment).permit(:title, :body)
end
end
index.html.erb
<h1>Listing questions</h1>
<%= link_to 'New Question', new_question_path %>
<hr>
<% #questions.each do |question| %>
<!-- Author -->
<%= question.user.name %> <br>
<!-- Date -->
<%= question.created_at %> <br>
<!-- Title -->
<%= question.title %> <br>
<!-- Body -->
<%= question.body %> <br>
<%= question.id %> <br>
<!-- Comment count -->
<%= question.comments.size %> Comment <br>
<!-- Comments -->
<% question.comments.each do |comment| %>
<!-- Comment Author -->
<%= comment.user.name %> <br>
<!-- Comment Date -->
<%= comment.created_at %> <br>
<!-- Comment Body -->
<%= comment.body %> <br>
<% end %>
<%= form_for(question.comments.new) do |f| %>
<div class="field">
<%= f.label :body %><br>
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
<hr>
<% end %>
Thank you in advance for your help! :)
The form_for will need to submit the question_id somehow - either by a route or through the form. I recommend a route.
If you don't interact with comments independently - if there is always a question, then change your routes to something like this:
resources :questions do
resources :comments
end
Then - in your form for, you will do this
<%= form_for [question, question.comments.new] do |f| %>
This will cause the form to submit (POST) to /question/:question_id/comments and you can handle it from there.
In the comments controller - you'll get the question from the params[:question_id] and return the result via an ajax response (respond to json).
This part is still tricky if you haven't done it before. If you need help with that part, you can probably find good examples or ask a separate question...
you can add hidden field inside your form
<%= f.hidden_field :question_id, value: question.id %>
or you can change your form
<%= form_for :comment, :url => comments_path(question_id:question.id) do |f| %>
<div class="field">
<%= f.label :body %><br>
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
when u submit this form u will have url like /comments?question_id=id
I'm starting to wonder if this is a bug with Rails 4, but I'm very new to rails and find myself smacking myself in the forehead eventually with most of the bugs I run in to. But I'm running into a wall on this one.
I have a Post. Posts have comments.
My Comment partial (/views/comments/_comment.html.erb)
<div class="comment-wrap">
<div class="row">
<div class="comment-meta">
<%= comment.commenter %>
<small><%= comment.created_at %></small>
<%= link_to 'Destroy', [comment.post, comment], method: :delete, confirm: 'Are you sure?', class: "tiny button radius right" %>
</div>
<div class="small-2 columns">
<img src="http://placehold.it/50" height="50" width="50" alt="Avatar Image"/>
</div>
<div class="small-10 columns">
<%= comment.body %>
</div>
</div>
</div>
Here is how I render that in .../views/posts/show.html.erb
<h4>Leave a comment</h4>
<%= render "comments/form" %>
<h4>Comments</h4>
<%= render #post.comments %>
Edit:Controller .../controllers/comments/comments_controller.rb
class CommentsController < ApplicationController
def create
#post = post.find(params[:post_id])
#comment = #post.comments.create(comment_params)
redirect_to post_path(#post)
end
def destroy
#post = post.find(params[:post_id])
#comment = #post.comments.find(params[:id])
#comment.destroy
redirect_to post_path(#post)
end
private
def comment_params
params.require(:comment).permit(:commenter, :body, :post_id)
end
end
Edit: Posts Controller
class postsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
# GET /posts
# GET /posts.json
def index
#posts = post.all
end
# GET /posts/1
# GET /posts/1.json
def show
end
# GET /posts/new
def new
#post = post.new
end
# GET /posts/1/edit
def edit
end
# POST /posts
# POST /posts.json
def create
#post = post.new(post_params)
respond_to do |format|
if #post.save
format.html { redirect_to #post, notice: 'post was successfully created.' }
format.json { render action: 'show', status: :created, location: #post }
else
format.html { render action: 'new' }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /posts/1
# PATCH/PUT /posts/1.json
def update
respond_to do |format|
if #post.update(post_params)
format.html { redirect_to #post, notice: 'post was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #post.errors, status: :unprocessable_entity }
end
end
end
# DELETE /posts/1
# DELETE /posts/1.json
def destroy
#post.destroy
respond_to do |format|
format.html { redirect_to posts_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = post.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def post_params
params.require(:post).permit(:name, :description, :date, :address)
end
end
This will list out the comments, but the first item is always an empty partial, with the placeholder avatar and a delete button. I've checked in rails console to see how many comments a particular post has, just to make sure there wasn't some empty record in the db, but that's not the case. Why am I getting this empty and additional partial that does not match up with a database record?
It is because #post.comments.build in comments/form.html.erb. build() will always create a new empty object, and that comes before render(). Try replacing it with Comment.new so the empty comment won't be associated with the post.
The issue is that the form is above the <%= render #post.comments %> so there is an empty comment when you reach the partial for all the comments, even if there's none in database, put the <%= render "comments/form" %> below to fix this.