Add missing image model spec. Add shared specs to check image validations at any imageable model

app/controllers/direct_uploads_controller.rb

@@ -0,0 +1,40 @@
+class DirectUploadsController < ApplicationController
+
+  def destroy_upload
+    @document = Document.new(cached_attachment: params[:path])
+    @document.set_attachment_from_cached_attachment
+    @document.cached_attachment = nil
+    @document.documentable = @documentable
+
+    if @document.attachment.destroy
+      flash.now[:notice] = t "documents.actions.destroy.notice"
+    else
+      flash.now[:alert] = t "documents.actions.destroy.alert"
+    end
+    render :destroy
+  end
+
+  def upload
+    @document = Document.new(document_params.merge(user: current_user))
+    @document.documentable = @documentable
+    @document.valid?
+
+    if @document.valid?
+      @document.attachment.save
+      @document.set_cached_attachment_from_attachment(URI(request.url))
+    else
+      @document.attachment.destroy
+    end
+  end
+
+  private
+
+  def set_attachment_container_resource
+    @container_resource = params[:resource_type]
+  end
+
+  def find_attachment_container_resource
+    @uplo = params[:documentable_type].constantize.find_or_initialize_by(id: params[:documentable_id])
+  end
+
+end