paperclip Is a plugin for rails processing attachments, compared to the pastattachment_fuWaiting for better efficiency and use.

 

  paperclipUploaded image attachments do not require ImageMagick to be installed if you do not need to change the size. Paperclip for image processing under the window platform is easy to get such error message

。。。is not recognized by the 'identify' command

It took 1.5h to finally find a solution like this on a walled blog: Create a new paperclip.rb file in the project's config/iniinitializers directory and write the following code:

Paperclip.options[:command_path] = 'D://Program Files//ImageMagick' # Your imageMagick installation directory
Paperclip.options[:swallow_stderr] = false

 

Modify the User model Add the following code

has_attached_file :avatar, :styles => { :medium => "200x200>", :thumb => "32x32>" }

Execute the following code to add 4 columns to the users table

script/generate paperclip User avatar 

 

Form:

<% form_for current_users, :html => {:multipart => true} do|form|%>       
　<%= form.file_field :avatar %>
   <%=form.submit 'Upload ' %>
<% end %> 

 

Because the User model is generated using the restful_authentication plugin, if it is uploaded, it will not work, and the uploaded attachment will be filtered out. After uploading, the column related to the attachment in the Users table is still nill, then look at the console information:

WARNING: Can't mass-assign these protected attributes: avatar

I searched the Internet and I understand that it is the reason. The restful_authentication helped us generate some of these in the User model.

# anything else you want your user to change should be added here.
  attr_accessible :login, :email, :password, :password_confirmation

Adding on the attr_accessible: avater is ok.

 

As for other ways of using paperclip, continue to study later. Today only records problems encountered during the use process.