mongoid_paperclip_tutorial.md

Implement Image upload with Mongoid Paperclip

Rails 4.0.4 and Mongoid(MongoDB)

Gems

• gem "mongoid-paperclip", "~> 0.0.8", :require => "mongoid_paperclip"
• gem "aws-s3", :require => "aws/s3"

*bundle install

you don't need to add the amazon web services gem at the moment, but you may need it later during production to store images

Model

include Mongoid::Paperclip

Photos Model Method (Having multiple photos belong to another Model)

Include in Photo model

belongs_to :your_model_that_photos_belong_to has_mongoid_attached_file :image validates_attachment_content_type :image, content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"]

Avatar Method (Adding one photo to existing model)

Include in your model (below I reference your_model_name)

has_mongoid_attached_file :image validates_attachment_content_type :image, content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"]

Controller

• Add :image to the params of that controller to enable it to accept an uploaded file in the view

View

In your view for that model (wherever you would like the user to be able upload the image (index, show, new))

Photos Model Method (views)

New

<%= form_for @photo, {url: photos_path(@photo)} do |f| %> <%= f.file_field :image %> <%= f.submit "Upload" %> <% end %>

Avatar Method (views)

New

<%= form_for @your_model_name do |f| %> <%= f.file_field :image %> <%= f.submit "Upload" %> <% end %>

Show

<%= image_tag @your_model_name.image.url %>

Let me know if something is not working or you see something that needs to be changed!