Question

I have a web app which uses Devise for authentication. It is a site which allows the user to upload images so the url would be /images/2. There is a separate image controller.

How would I go about showing the Users name on that image? I have put = user.name to show the user name, this is HAML by the way. I have also tried = @user.name

= user.name shows undefined local variable or method user for #<#<Class:0x007f8f9c28d2e0>:0x007f8f9c287f70>

= @user.name shows undefined method name for nil:NilClass

Answer 1

Do you have an association between the image and the user that posted the image? Like this:

# image.rb
belongs_to :user

# user.rb
has_many :images

In that case you do not have to set the @user variable in your controller. You can access the owning user directly by using @image.user in your view. To post the username you can chain it like this: @image.user.name, even better would be to modify the to_s method of your user as shown below. This method gets called automatically if you try to display your object, so you could just display the name using @image.user then.

# user.rb
def to_s
  self.name
end