I'm trying to print an image using the Paperclip gem.
When I print using views/devise/edit.html.rb everything looks good but when I want print in views/layout/application.html.rb I'm getting this error in console:
ActionView::Template::Error (undefined method `avatar' for nil:NilClass):
7: <%= csrf_meta_tags %>
8: </head>
9: <body>
10: <%= image_tag @user.avatar.url(:thumb) %>
11: <%= yield %>
12:
13: </body>
app/views/layouts/application.html.erb:10:in `_app_views_layouts_application_html_erb___4291648939640547438_70254980514000'
This is User.rb:
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_attached_file :avatar, :styles => { :medium => ["300x300>"], :thumb => ["100x100>"], :page => ["800"] }
end
This is application_controller.rb:
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
before_action :configure_permitted_parameters, if: :devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:first_name, :last_name, :email, :password, :password_confirmation) }
devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:first_name, :last_name, :email, :password, :password_confirmation, :current_password, :avatar) }
end
end
@user here is undefined. You can define it in the controller or use Devise's current_user helper.
Replacing:
@user.avatar.url(:thumb)
with:
current_user.avatar.url(:thumb)
should get you past this error as long as a user is signed in when seeing this view. Otherwise you'll need to check for nil before calling #avatar.