.. |Python package| image:: https://github.com/podhmo/alchemyjsonschema/actions/workflows/python-package.yml/badge.svg :target: https://github.com/podhmo/alchemyjsonschema/actions/workflows/python-package.yml
alchemyjsonschema is the library for converting sqlalchemys's model to jsonschema.
having three output styles.
examples ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
dumping json with above three output styles.
target models are here. Group and User.
.. code:: python
import sqlalchemy as sa import sqlalchemy.orm as orm from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Group(Base): """model for test""" tablename = "Group"
pk = sa.Column(sa.Integer, primary_key=True, doc="primary key")
name = sa.Column(sa.String(255), default="", nullable=False)
class User(Base): tablename = "User"
pk = sa.Column(sa.Integer, primary_key=True, doc="primary key")
name = sa.Column(sa.String(255), default="", nullable=True)
group_id = sa.Column(sa.Integer, sa.ForeignKey(Group.pk), nullable=False)
group = orm.relationship(Group, uselist=False, backref="users")
NoForeignKeyWalker
.. code:: python
import pprint as pp
from alchemyjsonschema import SchemaFactory
from alchemyjsonschema import NoForeignKeyWalker
factory = SchemaFactory(NoForeignKeyWalker)
pp.pprint(factory(User))
"""
{'properties': {'name': {'maxLength': 255, 'type': 'string'},
'pk': {'description': 'primary key', 'type': 'integer'}},
'required': ['pk'],
'title': 'User',
'type': 'object'}
"""
ForeignKeyWalker
.. code:: python
import pprint as pp from alchemyjsonschema import SchemaFactory from alchemyjsonschema import ForeignKeyWalker
factory = SchemaFactory(ForeignKeyWalker) pp.pprint(factory(User))
""" {'properties': {'group_id': {'type': 'integer'}, 'name': {'maxLength': 255, 'type': 'string'}, 'pk': {'description': 'primary key', 'type': 'integer'}}, 'required': ['pk', 'group_id'], 'title': 'User', 'type': 'object'} """
StructuralWalker
.. code:: python
import pprint as pp
from alchemyjsonschema import SchemaFactory
from alchemyjsonschema import StructuralWalker
factory = SchemaFactory(StructuralWalker)
pp.pprint(factory(User))
"""
{'definitions': {'Group': {'properties': {'pk': {'description': 'primary key',
'type': 'integer'},
'name': {'maxLength': 255,
'type': 'string'}},
'type': 'object'}},
'properties': {'pk': {'description': 'primary key', 'type': 'integer'},
'name': {'maxLength': 255, 'type': 'string'},
'group': {'$ref': '#/definitions/Group'}},
'required': ['pk'],
'title': 'User',
'type': 'object'}
"""
pp.pprint(factory(Group))
"""
{'definitions': {'User': {'properties': {'pk': {'description': 'primary key',
'type': 'integer'},
'name': {'maxLength': 255,
'type': 'string'}},
'type': 'object'}},
'description': 'model for test',
'properties': {'pk': {'description': 'primary key', 'type': 'integer'},
'name': {'maxLength': 255, 'type': 'string'},
'users': {'items': {'$ref': '#/definitions/User'},
'type': 'array'}},
'required': ['pk', 'name'],
'title': 'Group',
'type': 'object'}
"""
as command
----------------------------------------
using alchemyjsonschema as command (the command name is also `alchemyjsonschema`).
help
.. code:: bash
$ alchemyjsonschema --help
usage: alchemyjsonschema [-h] [--walker {noforeignkey,foreignkey,structural}]
[--decision {default,fullset}] [--depth DEPTH]
[--out OUT]
target
positional arguments:
target the module or class to extract schemas from
optional arguments:
-h, --help show this help message and exit
--walker {noforeignkey,foreignkey,structural}
--decision {default,fullset}
--depth DEPTH
--out OUT output to file
If above two model definitions (User,Group) are existed in `alchemyjsonschema.tests.models` .
Target is the class position or module position. for example,
- class position -- `alchemyjsonschema.tests.models:User`
- module position -- `alchemyjsonschema.tests.models`
example
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Using StructuralWalker via command line (--walker structural).
Of course, NoForeignKeyWalker is noforeignkey, and ForeignKeyWalker is foreignkey.
.. code:: bash
$ alchemyjsonschema --walker structural alchemyjsonschema.tests.models:Group
{
"definitions": {
"Group": {
"properties": {
"color": {
"enum": [
"red",
"green",
"yellow",
"blue"
],
"maxLength": 6,
"type": "string"
},
"created_at": {
"format": "date-time",
"type": "string"
},
"name": {
"maxLength": 255,
"type": "string"
},
"pk": {
"description": "primary key",
"type": "integer"
},
"users": {
"items": {
"$ref": "#/definitions/User"
},
"type": "array"
}
},
"required": [
"pk"
],
"title": "Group",
"type": "object"
},
"User": {
"properties": {
"created_at": {
"format": "date-time",
"type": "string"
},
"name": {
"maxLength": 255,
"type": "string"
},
"pk": {
"description": "primary key",
"type": "integer"
}
},
"required": [
"pk"
],
"type": "object"
}
}
}
Output is not same when using Walker-class, directly. This is handy output for something like a swagger(OpenAPI 2.0)'s tool.
appendix: what is `--decision` ?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
what is `--decision`? (TODO: gentle description)
.. code-block:: bash
$ alchemyjsonschema --walker structural alchemyjsonschema.tests.models:User | jq . -S > /tmp/default.json
$ alchemyjsonschema --decision useforeignkey --walker structural alchemyjsonschema.tests.models:User | jq . -S > /tmp/useforeignkey.json
$ diff -u /tmp/default.json /tmp/useforeignkey.json
.. code-block:: diff
--- /tmp/default.json 2017-01-02 22:49:44.000000000 +0900
+++ /tmp/useforeignkey.json 2017-01-02 22:53:13.000000000 +0900
@@ -1,43 +1,14 @@
{
"definitions": {
- "Group": {
- "properties": {
- "color": {
- "enum": [
- "red",
- "green",
- "yellow",
- "blue"
- ],
- "maxLength": 6,
- "type": "string"
- },
- "created_at": {
- "format": "date-time",
- "type": "string"
- },
- "name": {
- "maxLength": 255,
- "type": "string"
- },
- "pk": {
- "description": "primary key",
- "type": "integer"
- }
- },
- "required": [
- "pk"
- ],
- "type": "object"
- },
"User": {
"properties": {
"created_at": {
"format": "date-time",
"type": "string"
},
- "group": {
- "$ref": "#/definitions/Group"
+ "group_id": {
+ "relation": "group",
+ "type": "integer"
},
"name": {
"maxLength": 255,
FAQs
A package for generating json-schema models from sqlalchemy models.
We found that alchemyjsonschema demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
PyPI confirms no security flaws were exploited in the Ultralytics supply chain attack and highlights improvements for safer package publishing.
Security News
Research
The Socket Research Team breaks down a malicious wrapper package that uses obfuscation to harvest credentials and exfiltrate sensitive data.
Research
Security News
Attackers used a malicious npm package typosquatting a popular ESLint plugin to steal sensitive data, execute commands, and exploit developer systems.