Please review the problems below: Rails created post - ruby-on-rails

Question

I dont't know why but when i'm trying to create post, i got this error.
I created a scaffold "post"
Then i wanted to get my posts in a different controller, in my Controller home.
I put "belongs_to :home" in my Post.rb
In this step, all is fine.
But when i'm trying to create post, i got this "Please review the problems below:"
Processing by PostsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"0QgNSnhZWnsa+U9iYi1RB2Yk+qoW1be0Mj/o3579Es74oKBD452HQxZF144KBhR+in7UaSf9OLpzAyn8aJrB6A==", "post"=>{"title"=>"sfsf", "content"=>"sdfsfsfs", "author"=>"sdfsfsdf"}, "commit"=>"Create Post"} (0.4ms) BEGIN (0.3ms) ROLLBACK Rendering posts/new.html.erb within layouts/application Rendered posts/new.html.erb within layouts/application (14.6ms) User Load (0.7ms) SELECT users. FROM users WHERE users.id = 2 ORDER BY users.id ASC LIMIT 1 Rendered layouts/_header.html.erb (6.8ms) Rendered layouts/_footer.html.erb (0.9ms) Completed 200 OK in 1512ms (Views: 381.2ms | ActiveRecord: 1.4ms)*
post_controller.rb
class PostsController < ApplicationController
before_action :set_post, only: [:show, :edit, :update, :destroy]
# GET /posts
# GET /posts.json
def index
#posts = Post.all.order("created_at DESC")
end
# GET /posts/1
# GET /posts/1.json
def show
#posts
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: 'Article crée.'}
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: 'Article édité.'}
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: 'Article supprimé.'}
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(:title, :content, :author)
end
end
post/new.html.erb
<div class="container left-box">
<h1 class="left-box-title">Ajouter un article</h1>
<%= simple_form_for #post, wrapper: :vertical_form do |f| %>
<%= f.error_notification %>
<%= f.input :title, label: 'Titre' %>
<p>Contenu</p>
<%= f.text_area :content, class: 'col-md-12 form-control content_post_create' %>
<%= f.input :author, label: 'Auteur' %>
<%= f.button :submit, class: "btn-primary", label: 'Mettre en ligne' %>
<%= f.button :button, "Recommencer", type: "reset", class: "btn-outline-secondary" %>
<% end %>
<%= link_to "Retour à l'accueil", posts_path %>
</div>

Answer 1

Your error comes from belongs_to :home in Post.rb:
The belongs_to association creates a one-to-one match with another
model. In database terms, this association says that this class
contains the foreign key. (source)
If you add the error full messages in your form like this:
<%= simple_form_for #post, wrapper: :vertical_form do |f| %>
<ul>
<% #post.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
...
<% end %>
you should see this error: Home must exist
To fix your issue you can remove the belongs_to association or, if Home is really a model, add the home_id to #post in your create action before saving.