freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/6a1d9f98e819ed70a0e994d9.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a1d9f98e819ed70a0e994d9	Challenge 327: Database Migration	29	challenge-327

--description--

Given two database objects, return the second object with any missing properties from the first filled in.

• Fields that already exist in the record should not be overwritten.

--hints--

migrate_record({ "username": "", "posts": 0 }, { "verified": True }) should return { "username": "", "posts": 0, "verified": True }.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(migrate_record({ "username": "", "posts": 0 }, { "verified": True }), { "username": "", "posts": 0, "verified": True })`)
}})

migrate_record({ "username": "", "posts": 0 }, { "username": "camper", "posts": 5 }) should return { "username": "camper", "posts": 5 }.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(migrate_record({ "username": "", "posts": 0 }, { "username": "camper", "posts": 5 }), { "username": "camper", "posts": 5 })`)
}})

migrate_record({ "username": "", "posts": 0, "verified": False }, { "username": "camper" }) should return { "username": "camper", "posts": 0, "verified": False }.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(migrate_record({ "username": "", "posts": 0, "verified": False }, { "username": "camper" }), { "username": "camper", "posts": 0, "verified": False })`)
}})

migrate_record({ "username": "", "posts": 0 }, { "username": "camper", "role": "admin" }) should return { "username": "camper", "role": "admin", "posts": 0 }.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(migrate_record({ "username": "", "posts": 0 }, { "username": "camper", "role": "admin" }), { "username": "camper", "role": "admin", "posts": 0 })`)
}})

migrate_record({ "username": "", "email": "", "posts": 0, "verified": False, "role": "user", "banned": False }, { "username": "camper", "email": "camper@freecodecamp.org", "role": "admin" }) should return { "username": "camper", "email": "camper@freecodecamp.org", "role": "admin", "posts": 0, "verified": False, "banned": False }.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(migrate_record({ "username": "", "email": "", "posts": 0, "verified": False, "role": "user", "banned": False }, { "username": "camper", "email": "camper@freecodecamp.org", "role": "admin" }), { "username": "camper", "email": "camper@freecodecamp.org", "role": "admin", "posts": 0, "verified": False, "banned": False })`)
}})

--seed--

--seed-contents--

def migrate_record(schema, record):

    return schema

--solutions--

def migrate_record(schema, record):
    return {**schema, **record}