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Created July 17, 2013 10:28
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Paperclip with Rails4 and active admin
ActiveAdmin.register Project do
# Don't forget to add the image attribute (here thumbnails) to permitted_params
controller do
def permitted_params
params.permit project: [:title, :summary, :description, :thumbnail, :date, :url, :client_list, :technology_list, :type_list]
form do |f|
f.inputs "Project Details" do
f.input :title
f.input :thumbnail, :as => :file, :hint => f.template.image_tag(f.object.thumbnail.url(:thumb))
# Will preview the image when the object is edited
show do |ad|
attributes_table do
row :title
row :thumbnail do
# Will display the image on show object page
class Project < ActiveRecord::Base
has_attached_file :thumbnail, :styles => { :medium => "300x300#", :thumb => "200x200#" }
# 200x200# crop the image
# 200x200> scale the image to 200px wide at maximum keeping aspect ratio
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thanks for sharing, but have some errors here:


Showing /.rvm/gems/ruby-2.1.1/bundler/gems/active_admin-ee996b09edb9/app/views/active_admin/resource/new.html.arb where line #1 raised:

wrong number of arguments (1 for 0)
Extracted source (around line #1):
insert_tag renderer_for(:new)

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Finally get it worked:
Above in "admin-projects.rb" file, 13 line change into:

f.input :thumbnail, :required => false, :as => :file

Also in "project.rb", add extra line :

validates_attachment :thumbnail, content_type: { content_type: ["image/jpg", "image/jpeg",     "image/png"] } 

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Thanks for sharing, @jameslafa. The protected params can be written in one line. It doesn't require the controller wrapper or permitted_params method.

permit_params :title, :summary, :description, :thumbnail, :date, :url, :client_list, :technology_list, :type_list

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vuongnd commented Jun 17, 2016

thanks for sharing .... It too simple after I read this doc

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skad0 commented Jun 23, 2016

I think, f.template on str 13 is unnecessary and may cause weird output like <Class:..>.
It should be
hint: f.template.image_tag(f.object.thumbnail.url(:thumb))

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turkoz commented Sep 8, 2016

Thanks for your sharing. I am getting some weird message in edit form while using f.template.image_tag. I suggest using image_tag like below:
hint: image_tag(f.object.thumbnail.url(:thumb))

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Preen commented Feb 6, 2017

@turkoz yes! Works nice

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Your comments were all very useful for me - I thank you.

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hyy i need help Active Admin image uploading for product please help me ...

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