---
id: 6a0dcc730cb92a616f86f0c4
title: "Challenge 300: Schema Validator Part 6"
challengeType: 29
dashedName: challenge-300
---

# --description--

Given an object (JavaScript) or dictionary (Python), determine if it matches the following schema:

```json
Roles = "user" | "creator" | "moderator" | "staff" | "admin"

UserProfile = {
  username: string,
  posts: number,
  verified: boolean,
  role: Roles,
  supporter?: boolean,
  badges: string[]
}

{
  users: UserProfile[]
}
```

- The pipe (`|`) symbol means "or". role must be one of the listed `Roles` values.
- The question mark (`?`) after supporter means that the field is optional, but is the specified type if it exists.
- `UserProfile[]` denotes an array of `UserProfile` objects. An empty array is valid.
- Extra keys are allowed

# --hints--

`is_valid_schema({"users": [{"username": "ron", "posts": 14, "verified": True, "role": "creator", "badges": ["early-adopter"]}, {"username": "cher", "posts": 25, "verified": True, "role": "moderator", "supporter": True, "followers": 20, "badges": ["helper"]}]})` should return `True`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "ron", "posts": 14, "verified": True, "role": "creator", "badges": ["early-adopter"]}, {"username": "cher", "posts": 25, "verified": True, "role": "moderator", "supporter": True, "followers": 20, "badges": ["helper"]}]}), True)`)
}})
```

`is_valid_schema({"users": []})` should return `True`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": []}), True)`)
}})
```

`is_valid_schema({"users": {"username": "anne", "posts": 0, "verified": False, "role": "user", "supporter": False, "badges": []}})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": {"username": "anne", "posts": 0, "verified": False, "role": "user", "supporter": False, "badges": []}}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "tony", "posts": 10, "verified": True, "role": "creator", "supporter": True, "badges": ["liked", 6]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "tony", "posts": 10, "verified": True, "role": "creator", "supporter": True, "badges": ["liked", 6]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "ursula", "posts": 3, "verified": False, "role": "user", "supporter": "false", "badges": ["comeback"]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "ursula", "posts": 3, "verified": False, "role": "user", "supporter": "false", "badges": ["comeback"]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "benny", "posts": 55, "verified": True, "role": "superstar", "supporter": True, "badges": ["veteran"]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "benny", "posts": 55, "verified": True, "role": "superstar", "supporter": True, "badges": ["veteran"]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "chase", "posts": 1, "verified": "yes", "role": "staff", "supporter": False, "badges": ["superstar"]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "chase", "posts": 1, "verified": "yes", "role": "staff", "supporter": False, "badges": ["superstar"]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "carla", "posts": "10", "verified": False, "role": "user", "supporter": False, "badges": ["newbie"]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "carla", "posts": "10", "verified": False, "role": "user", "supporter": False, "badges": ["newbie"]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"posts": 4, "verified": False, "role": "admin", "supporter": False, "badges": ["superuser", "veteran"]}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"posts": 4, "verified": False, "role": "admin", "supporter": False, "badges": ["superuser", "veteran"]}]}), False)`)
}})
```

`is_valid_schema({"users": [{"username": "harold", "posts": 80, "verified": True, "role": "creator", "supporter": True, "badges": ["liked", "hero"]}, {"username": "kim", "posts": 11, "verified": False, "role": "admin", "supporter": True, "badges": ["first"]}, {}]})` should return `False`.

```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_valid_schema({"users": [{"username": "harold", "posts": 80, "verified": True, "role": "creator", "supporter": True, "badges": ["liked", "hero"]}, {"username": "kim", "posts": 11, "verified": False, "role": "admin", "supporter": True, "badges": ["first"]}, {}]}), False)`)
}})
```

# --seed--

## --seed-contents--

```py
def is_valid_schema(obj):

    return obj
```

# --solutions--

```py
def is_valid_schema(obj):
    roles = ["user", "creator", "moderator", "staff", "admin"]

    def is_valid_user(user):
        return (
            isinstance(user.get("username"), str) and
            isinstance(user.get("posts"), int) and not isinstance(user.get("posts"), bool) and
            isinstance(user.get("verified"), bool) and
            user.get("role") in roles and
            ("supporter" not in user or isinstance(user["supporter"], bool)) and
            isinstance(user.get("badges"), list) and all(isinstance(b, str) for b in user["badges"])
        )

    return isinstance(obj.get("users"), list) and all(is_valid_user(u) for u in obj["users"])
```