How to check from view if processing?

[dt1973]

How to check from the view if an attachment is processing?

Can't get this to work:

photo.rb

class Photo < ActiveRecord::Base
  has_attached_file :attachment,
    styles: {
      medium: "800x600#",
      thumbnail: "70x70#"
    }

  validates_attachment :attachment, presence: true, content_type: {
    content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"]
  }

  process_in_background :attachment

  before_post_process :set_attachment_is_processing
  after_post_process :set_attachment_is_processing

private
  def set_attachment_is_processing
    self.attachment_is_processing = true if attachment.processing?
  end
end

_post.html.erb

<% if photo.attachment_is_processing %>
  <p>Please wait while we process your upload...</p>
<% else %>
  <%= image_tag photo.attachment(:medium) %>
<% end %>

[dt1973]

Apparently I just had to add the :attachment_processing column and the rest is automatic. Shoutout to @zonecheung and @Xtinct.

photo.rb

class Photo < ActiveRecord::Base
  has_attached_file :attachment,
    styles: {
      medium: "800x600#",
      thumbnail: "70x70#"
    }

  validates_attachment :attachment, presence: true, content_type: {
    content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"]
  }

  process_in_background :attachment
end

_post.html.erb

<% if photo.attachment_processing %>
  <p>Please wait while we process your upload...</p>
<% else %>
  <%= image_tag photo.attachment(:medium) %>
<% end %>