appwrite/docs/examples/1.4.x/server-ruby/examples/functions/update.md

require 'appwrite'

include Appwrite

client = Client.new
    .set_endpoint('https://cloud.appwrite.io/v1') # Your API Endpoint
    .set_project('5df5acd0d48c2') # Your project ID
    .set_key('919c2d18fb5d4...a2ae413da83346ad2') # Your secret API key

functions = Functions.new(client)

response = functions.update(function_id: '[FUNCTION_ID]', name: '[NAME]')

puts response.inspect