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+# Active File
+
+...
+
+## Example
+
+class Person < ApplicationRecord
+  has_one :avatar
+end
+
+class Avatar < ApplicationRecord
+  belongs_to :person
+  belongs_to :image, class_name: 'ActiveFile::Blob'
+
+  has_file :image
+end
+
+avatar.image.url(expires_in: 5.minutes)
+
+
+class ActiveFile::DownloadsController < ActionController::Base
+  def show
+    head :ok, ActiveFile::Blob.locate(params[:id]).download_headers
+  end
+end
+
+
+class AvatarsController < ApplicationController
+  def create
+    # @avatar = Avatar.create \
+    #   image: ActiveFile::Blob.save!(file_name: params.require(:name), content_type: request.content_type, data: request.body)
+    @avatar = Avatar.create! image: Avatar.image.extract_from(request)
+  end
+end
+
+
+class ProfilesController < ApplicationController
+  def update
+    @person.update! avatar: @person.avatar.update!(image: )
+  end
+end
+
+## License
+
+Google Sign-In for Rails is released under the [MIT License](https://opensource.org/licenses/MIT).