JSON Schema Draft v4 (http://json-schema.org/) formatting with marshmallow
Project description
marshmallow-jsonschema translates marshmallow schemas into JSON Schema Draft v4 compliant jsonschema. See http://json-schema.org/
Why would I want my schema translated to JSON?
What are the use cases for this? Let’s say you have a marshmallow schema in python, but you want to render your schema as a form in another system (for example: a web browser or mobile device).
Installation
pip install marshmallow-jsonschema
Some Client tools can render forms using JSON Schema
Simple Example
from marshmallow import Schema, fields
from marshmallow_jsonschema import JSONSchema
class UserSchema(Schema):
username = fields.String()
age = fields.Integer()
birthday = fields.Date()
user_schema = UserSchema()
json_schema = JSONSchema()
json_schema.dump(user_schema).dataYields:
{'properties': {'age': {'format': 'integer',
'title': 'age',
'type': 'number'},
'birthday': {'format': 'date',
'title': 'birthday',
'type': 'string'},
'username': {'title': 'username', 'type': 'string'}},
'required': [],
'type': 'object'}Nested Example
from marshmallow import Schema, fields
from marshmallow_jsonschema import JSONSchema
from tests import UserSchema
class Athlete(object):
user_schema = UserSchema()
def __init__(self):
self.name = 'sam'
class AthleteSchema(Schema):
user_schema = fields.Nested(JSONSchema)
name = fields.String()
athlete = Athlete()
athlete_schema = AthleteSchema()
athlete_schema.dump(athlete).dataComplete example Flask application using brutisin/json-forms
[Screenshot] (http://i.imgur.com/jJv1wFk.png)
This example renders a form not dissimilar to how wtforms might render a form.
However rather than rendering the form in python, the JSON Schema is rendered using the javascript library brutusin/json-forms.
from flask import Flask, jsonify
from marshmallow import Schema, fields
from marshmallow_jsonschema import JSONSchema
app = Flask(__name__)
class User(object):
def __init__(self, name, address):
self.name = name
self.address = address
class UserSchema(Schema):
name = fields.String()
address = fields.String()
@app.route('/')
def home():
return '''<!DOCTYPE html>
<head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/brutusin.json-forms/1.3.0/css/brutusin-json-forms.css"><Paste>
<script src="https://code.jquery.com/jquery-1.12.1.min.js" integrity="sha256-I1nTg78tSrZev3kjvfdM5A5Ak/blglGzlaZANLPDl3I=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.string/3.3.4/underscore.string.min.js"></script>
<script src="https://cdn.jsdelivr.net/brutusin.json-forms/1.3.0/js/brutusin-json-forms.min.js"></script>
<script>
$(document).ready(function() {
$.ajax({
url: '/schema'
, success: function(data) {
var container = document.getElementById('myform');
var BrutusinForms = brutusin["json-forms"];
var bf = BrutusinForms.create(data);
bf.render(container);
}
});
});
</script>
</head>
<body>
<div id="myform"></div>
</body>
</html>
'''
@app.route('/schema')
def schema():
schema = UserSchema()
return jsonify(JSONSchema().dump(schema).data)
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True)Custom Type support
Simply add a _jsonschema_type_mapping method to your field so we know how it ought to get serialized to JSON Schema.
class Colour(fields.Field):
def _jsonschema_type_mapping(self):
return {
'type': 'string',
}
def _serialize(self, value, attr, obj):
r, g, b = value
r = hex(r)[2:]
g = hex(g)[2:]
b = hex(b)[2:]
return '#' + r + g + b
class UserSchema(Schema):
name = fields.String(required=True)
favourite_colour = Colour()
schema = UserSchema()
json_schema = JSONSchema()
json_schema.dump(schema).dataRelease history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
Hashes for marshmallow-jsonschema-0.1.7.tar.gz
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | c1945ef66153b63f431645801a643832d1f2d8e67a17039d9131f138376e54f0 |
|
| MD5 | 7fa971514592dfd7ce241e8a015ef1a0 |
|
| BLAKE2b-256 | e0c630be53866793aafec95108f6f3ad083f412e15cdf70df1984f4c2c01afc9 |
