CODEWITHSUNDEEP
ruby-on-railsruby
user4584963
user4584963

Reputation: 2523

How to use a method's string argument as a method name variable

In my rails app I am using carrierwave for images. Carrierwave creates different versions of an image and the url can be obtained like this: picture.large.url, picture.small.url, picture.thumb.url, etc.

I would like to create a method that can accept a string argument that can then be used for the image url. Something like this:

def profile_url (version)
  picture.version.url
end

So then I can write @user.profile_url('thumb') and it should give me the url in thumb size.

I get an undefined method 'version' error. Is this possible?

Upvotes: 1

Views: 106

Answers (2)

Stefan
Stefan

Reputation: 114138

According to the documentation for CarrierWave's url, you can pass the version as an argument:

When given a version name as a parameter, will return the url for that version [...]

my_uploader.url           #=> /path/to/my/uploader.gif
my_uploader.url(:thumb)   #=> /path/to/my/thumb_uploader.gif

Your code can be written as:

class User < ActiveRecord::Base
  mount_uploader :picture, PictureUploader

  def profile_url(version)
    picture.url(version)
  end
end

And called via:

@user.profile_url('thumb')
# or
@user.profile_url(:thumb)

You could also invoke the method directly:

@user.picture.url('thumb')
# or
@user.picture.url(:thumb)

Upvotes: 1

tadman
tadman

Reputation: 211540

Normally you can do it this way:

def profile_url(version)
  version = version.to_sym

  case version
  when :large, :small, :thumb
    picture.send(version).url
  end
end

The reason for the to_sym call here is so you can call this profile_url('thumb') or profile_url(:thumb) and both will work.

Upvotes: 6

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