"Unknown attribute: avatar" when uploading image with Paperclip?

devise, paperclip, ruby, ruby-on-rails, ruby-on-rails-4

Solution

Added

def user_params
  params.require(:user).permit(:avatar)
end

to my UsersController to fix the issue.

Problem

I ran this migration: ``` rails generate paperclip user avatar ``` It created this migration file: ``` class AddAttachmentAvatarToUsers < ActiveRecord::Migration def self.up change_table :users do |t| t.attachment :avatar end end def self.down drop_attached_file :users, :avatar end end ``` I added this to my edit user registration view: ``` <div class="form-group"> <%= f.label :avatar %> <br> <%= f.file_field :avatar, :autofocus => true, class: 'form-control' %> </div> ``` When I try to upload an avatar in edit user registration, I receive this error: ActiveRecord::UnknownAttributeError in Devise::RegistrationsController#update unknown attribute: avatar EDITS I added ``` def user_params params.require(:user).permit(:avatar) end ``` to my user model and now I don't get the error, but now the profile picture just prints out as a link. I think I can find an answer to that.

Original source