Question

I am using paperclip for uploading file ( video and images). Have used the same attachment(source) for both video and images.

class Media < ActiveRecord::Base
  belongs_to :memory
  validates_attachment_presence :source
  validates_attachment_content_type :source,
    :content_type => [ video/mp4 ,  image/png ,  image/jpeg ,  image/jpg ,  image/gif ]
end

现在我想在不同案件中显示不同的错误信息。

When uploading file is image type but not the jpg/png/jpeg/gif.
When uploaded file is video type but not the mp4

How can i achieve this ? Any help would highly appreciated.

Answer 1

So finally I got the solution. I added 2 conditional validation for the same

class Media < ActiveRecord::Base
  belongs_to :memory
  validates_attachment_presence :source
  validates_attachment_content_type :source,
    :content_type => [ video/mp4 ],
    :message => "Sorry, right now we only support MP4 video",
    :if => :is_type_of_video?
  validates_attachment_content_type :source,
     :content_type => [ image/png ,  image/jpeg ,  image/jpg ,  image/gif ],
     :message => "Different error message",
     :if => :is_type_of_image?
  has_attached_file :source

  protected
  def is_type_of_video?
    source.content_type =~ %r(video)
  end

  def is_type_of_image?
    source.content_type =~ %r(image)
  end
end

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