I wrote the code for you Twitter!

twitter_edit_code.rb

class TweetsController < ApplicationController

  def update
    tweet = Tweet.find(tweet_params[:id])
    if tweet.editable_by?(current_user)
      tweet.update!(body: tweet_params[:body])
    end
  end

  private

  def tweet_params
    params.require(:tweet).permit(:id, :body)
  end

end