Looking for an idea for a graceful way to DRY repetition regarding the error rescuing...

looking_for_ideas.rb

class Api::CollectionsController < ApplicationController
  def update
    @collection = Collection.where(pname: params[:id], event_id: @event.id).first
    @collection.assign_to(@event, params[:collection])

    @status = @collection.save! ? "ok" : "ko"
    render status: 200
  rescue Exception => e
    @status = "ArgumentError"
    @error = @collection.errors.keys
    render status: 400
  end

  def create
    @collection = Collection.new_by_type(params[:collection][:type])
    @collection.assign_to(@event, params[:collection])

    @status = @collection.save! ? "ok" : "ko"
    render status: 200
  rescue NameError => e
    @status = "NameError"
    @error = ["type"]
    render status: 400
  rescue Exception => e
    @status = "ArgumentError"
    @error = @collection.errors.keys
    render status: 400
  end
end

thx to @JohnMeiss for the link : http://stackoverflow.com/questions/8644577/how-to-rescue-exception-central-and-dry

class Api::CollectionsController < ApplicationController
  def update
    rescue_collection_operation do
      @collection = Collection.where(pname: params[:id], event_id: @event.id).first
      @collection.assign_to(@event, params[:collection])

      @status = @collection.save! ? "ok" : "ko"
      render status: 200
    end
  end

  def create
    rescue_collection_operation do
      @collection = Collection.new_by_type(params[:collection][:type])
      @collection.assign_to(@event, params[:collection])

      @status = @collection.save! ? "ok" : "ko"
      render status: 200
    end
  end

  private

  def rescue_collection_operation
    yield
  rescue NameError => e
    @status = "NameError"
    @error = ["type"]
    render status: 400
  rescue Exception => e
    @status = "ArgumentError"
    @error = @collection.errors.keys
    render status: 400
  end
end