Problems with adding images to user - ruby-on-rails

Question

When I push submit button in _form, Image should be created and linked to the user, but something went wrong. I use the same Image model for Ads and there almost the same code works right. Maybe the problem can somehow be connected with the inconsistency of devise user controllers and my user controller?
Users controller
class UsersController < ApplicationController
before_action :set_user, only: [:show, :edit, :update, :destroy]
def index
end
def show
end
def new
#user = User.new
#user.images.build
end
def edit
authorize! :update, #user
#user.images.build
end
def create
#user = current_user
respond_to do |format|
if #user.save
format.html { redirect_to board_url }
format.json { render :show, status: :created, location: #user }
else
format.html { render :new }
format.json { render json: #user.errors, status: :unprocessable_entity}
end
end
end
def update
respond_to do |format|
if #user.update(user_params)
format.html { redirect_to board_url }
format.json { render :show, status: :ok, location: #user }
else
format.html { render :edit }
format.json { render json: #user.errors, status: :unprocessable_entity}
end
end
end
def destroy
authorize! :update, #user
#user.destroy
respond_to do |format|
format.html { redirect_to board_url }
format.json { head :no_content }
end
end
private
def set_user
#user = User.find(params[:id])
end
def user_params
params.require(:user).permit(:email, images_attributes: [:id, :name])
end
end
_form
<%= form_with(model: user, local: true) do |form| %>
<%= form.fields_for :images do |image| %>
<div class="image_fields">
<div class="field">
<%= image.label t('.img_name') %><br>
<%= image.text_field :name %>
</div>
</div>
<% end %>
<div class="actions">
<%= form.submit %>
</div>
<% end %>
class Image
class Image < ApplicationRecord
belongs_to :ad
belongs_to :user
validates :name, presence: true
...
class User
class User < ApplicationRecord
has_many :ads
has_many :images, dependent: :destroy
accepts_nested_attributes_for :images,
reject_if: proc { |attributes| attributes['name'].blank? },
allow_destroy: true
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
Migrations
class AddUserIdToImages < ActiveRecord::Migration[5.1]
def change
add_column :images, :user_id, :integer
end
end
class CreateImages < ActiveRecord::Migration[5.1]
def change
create_table :images do |t|
t.string :name
t.references :ad, foreign_key: true
t.timestamps
end
end
end

Answer 1

Please provide error message and backtrace.
I assume it is because "ad" reference is blank for the user.
And according to your code:
t.references :ad, foreign_key: true
So I think the issue is in database constraint
And the simplest solution is to change it to
add_column :images, :ad_id, :integer
Without foreign key.
Or for your case, you can add polimorhic association
Also, a question not related to the topic, but want to ask about
respond_to do |format|
if #user.save
format.html { redirect_to board_url }
format.json { render :show, status: :created, location: #user }
else
format.html { render :new }
format.json { render json: #user.errors, status: :unprocessable_entity}
end
end
Why are you saving inside respond_to method?
So in rails depth, there is a method:
def respond_to(&block)
...
block.call
...
end
And your #user.save will be called there. Are you sure you want it?