schemabuilder

JSON schema definition helpers

Project description

Helpers to build you define JSON schema for either validation or publication.

Requirements

It requires Python 2.7 and jsonschema. jsonschema or setuptools should be installed with Python.

Install

Using pip:

pip install schemabuilder

Or easy_install:

easty_install schemabuilder

You may install it manually:

git clone https://github.com/dinoboff/schemabuilder.git
cd schemabuilder
python setup.py install

Usage

Primitives

JSON schema primitives are represented by object of type:

schemabuilder.Str
schemabuilder.Bool
schemabuilder.Number
schemabuilder.Int
schemabuilder.Object
schemabuilder.Array

>>> import schemabuilder as jsb
>>> import pprint
>>>
>>> name = jsb.Str(pattern="^[a-zA-Z][- 'a-zA-Z0-9]+")
>>> email = jsb.Str(format="email")
>>> user = jsb.Object(properties={
...   'name': name(required=True),
...   'email': email(),
...   'home': jsb.Str(format='uri'),
... })
>>> pprint.pprint(user.to_dict())
{'properties': {'email': {'type': 'string'},
                'home': {'format': 'uri', 'type': 'string'},
                'name': {'type': 'string'}},
 'required': ['name'],
 'type': 'object'}

Schema

Schema collects those definitions for validation (using jsonschema) or publication.

>>> import schemabuilder as jsb
>>> import pprint
>>>
>>> my_schemas = jsb.Schema(id='http://example.com/schemas.json#')
>>> name = my_schemas.define(
...   'name', jsb.Str(pattern="^[a-zA-Z][- 'a-zA-Z0-9]+")
... )
>>> email = my_schemas.define('email', jsb.Str(format="email"))
>>> user = my_schemas.define('user', jsb.Object(properties={
...   'name': name(required=True),
...   'email': email(required=True),
... }))
>>>
>>> user.validate({'name': 'bob'})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "schemabuilder/schema.py", line 50, in validate
    validator.validate(data)
  File "/Users/bob/pyenv/lib/python2.7/site-packages/jsonschema/validators.py", line 117, in validate
    raise error
jsonschema.exceptions.ValidationError: 'email' is a required property

Failed validating 'required' in schema:
    {'properties': {'email': {'$ref': '#/definitions/email'},
                    'name': {'$ref': '#/definitions/name'}},
     'required': ['name', 'email'],
     'type': 'object'}

On instance:
    {'name': 'bob'}
>>>
>>> user.validate({'name': 'bob', 'email': 'bob@example.com'})
>>>
>>> import json
>>> print json.dumps(my_schemas.to_dict(), indent=4)
{
    "definitions": {
        "email": {
            "type": "string",
            "format": "email"
        },
        "user": {
            "required": [
                "name",
                "email"
            ],
            "type": "object",
            "properties": {
                "name": {
                    "$ref": "#/definitions/name"
                },
                "email": {
                    "$ref": "#/definitions/email"
                }
            }
        },
        "name": {
            "pattern": "^[a-zA-Z][- 'a-zA-Z0-9]+",
            "type": "string"
        }
    },
    "id": "http://example.com/schemas.json#",
    "$schema": "http://json-schema.org/draft-04/schema#"
}