Rails / Carrierwave gem - How can I access the image upload data as JSON?

问题

The Carrierwave gem allows me to enable users to upload one or more images (e.g., an avatar) and to display these images on a Rails-generated page, thus:

<%= image_tag(@user.avatar_url(:thumb)) %>

I'm wondering whether it's possible to retrieve the image data as JSON such that I receive a JSON response that looks like this:

[
    {
      "title": "The Title",
      "description": "The description",
      "url": "the/url",
      "thumbnail: "the/thumbnail/url"
    }
]

回答1:

Inside of a controller create a method (example :index)

def index
  @images = current_user.images.all
  respond_to do |format|
    format.html
    format.json { render :json => @images }
  end
end

You would access by browsing to /images/index.json. In this example users are setup using Devise so you get the current_user method. This works if the user is logged into the site. To get it working without having to have the user login create a token.

This also assumes that there is a separate model for images that belongs to users.

来源：https://stackoverflow.com/questions/27413458/rails-carrierwave-gem-how-can-i-access-the-image-upload-data-as-json