rails 6 form validation errors even when criteria is met - ruby-on-rails

Question

I am trying to add form validation to a simple blog post form. Currently I am testing for presence of title and description and if I submit an empty form it gives me the errors, but if I fill out the form it still gives me the errors. When I use byebug in my create action for the post_controller it shows the contents of the title and description that I enter but says permitted false.
Here is the form partial:
<%= form_with(model: post, local: true) do |f| %>
<% if post.errors.any? %>
<div class="row center-align">
<div class="card-panel alert alert-danger">
<span class="white-text">
<strong><%= pluralize(post.errors.count, "error") %></strong>
occured:
<ul>
<% post.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</span>
</div>
</div>
<% end %>
<div class="form-group">
<%= f.label :title %>
<%= f.text_field :title, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :description %>
<%= f.text_area :description, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :header_image %>
<%= f.file_field :header_image %>
</div>
<div class="mt-1">
<% if post.header_image.present? %>
<small>Current Image</small>
<%= image_tag(post.header_image, width: '100%') %>
<% end %>
</div>
<div class="actions">
<%= f.submit class: 'btn btn-primary mt-1 form-control' %>
</div>
<% end %>
Here is the post_controller:
module Authors
class PostsController < AuthorsController
before_action :set_post, only: [:edit, :update, :destroy]
# GET /posts
def index
#posts = current_author.posts
end
# GET /posts/new
def new
#post = current_author.posts.build
end
# GET /posts/1/edit
def edit
#element = #post.elements.build
end
# POST /posts
def create
#post = current_author.posts.build
if #post.save
redirect_to edit_post_path(#post), notice: 'Post was successfully created.'
else
render :new
end
end
# PATCH/PUT /posts/1
def update
if #post.update(post_params)
redirect_to edit_post_path(#post), notice: 'Post was successfully updated.'
else
render :edit
end
end
# DELETE /posts/1
def destroy
#post.destroy
redirect_to posts_url, notice: 'Post was successfully destroyed.'
end
private
# Use callbacks to share common setup or constraints between actions.
def set_post
#post = current_author.posts.find(params[:id])
end
# Only allow a list of trusted parameters through.
def post_params
params.require(:post).permit(:title, :description, :header_image)
end
end
end
And her is the post.rb:
class Post < ApplicationRecord
belongs_to :author
has_many :elements
has_one_attached :header_image
validates :title, :description, presence: true
end
The post form was working fine until I tried adding the validations.
When I add buy but and test it I get the following when I run params:
#<ActionController::Parameters {"authenticity_token"=>"1hQyn6kWCiCwAaeaUa1PD9q76D29RF-56LKof1uC64auGtNvA2VCZ-mDLdY7EjCYP9zWpLLvfkgkE33AUZP7Ng", "post"=>{"title"=>"Testing", "description"=>"test"}, "commit"=>"Create Post", "controller"=>"authors/posts", "action"=>"create"} permitted: false>
(byebug)

Answer 1

In the create method, you're not instantiating the Post object with post_params. So, #post.title and #post.description are nil causing the validations to fail.
#post = current_author.posts.build(post_params)