Features/jsonschema model

README.rst

@@ -12,7 +12,7 @@ Welcome to django-json-schema's documentation!
 
 |python-versions| |django-versions| |pypi-version|
 
-<One liner describing the project>
+A reusable Django app to store JSON schemas.
 
 .. contents::
 
@@ -21,8 +21,10 @@ Welcome to django-json-schema's documentation!
 Features
 ========
 
-* ...
-* ...
+* JsonSchemaModel consisting of
+    - name CharField
+    - schema JsonField
+    - validate(json) method to validate JSON against the schema.
 
 Installation
 ============
@@ -32,6 +34,7 @@ Requirements
 
 * Python 3.10 or above
 * Django 4.2 or newer
+* A database supporting django.db.models.JSONField
 
 
 Install
@@ -45,7 +48,19 @@ Install
 Usage
 =====
 
-<document or refer to docs>
+.. code-block:: python
+
+    from django_json_schema.models import JsonSchema
+
+    class ProductType(models.Model):
+        schema = models.ForeignKey(JsonSchema, on_delete=models.PROTECT)
+
+    class Product(models.Model):
+        json = models.JsonField()
+        type = models.ForeignKey(ProductType, on_delete=models.CASCADE)
+
+        def clean(self):
+            self.type.schema.validate(self.json)
 
 Local development
 =================

django_json_schema/admin.py

@@ -0,0 +1,25 @@
+import json
+
+from django import forms
+from django.contrib import admin
+
+from .models import JsonSchema
+
+
+class IndentedJSONEncoder(json.JSONEncoder):
+    def __init__(self, *args, indent, sort_keys, **kwargs):
+        super().__init__(*args, indent=2, **kwargs)
+
+
+class JsonSchemaAdminForm(forms.ModelForm):
+    schema = forms.JSONField(encoder=IndentedJSONEncoder)
+
+    class Meta:
+        model = JsonSchema
+        fields = "__all__"
+
+
+@admin.register(JsonSchema)
+class JsonSchemaAdmin(admin.ModelAdmin):
+    form = JsonSchemaAdminForm
+    search_fields = ["name"]

django_json_schema/locale/nl/LC_MESSAGES/django.po

@@ -0,0 +1,43 @@
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-01-07 05:36-0600\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <[email protected]>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+
+#: models.py:10
+msgid "name"
+msgstr "naam"
+
+#: models.py:10
+msgid "Name of the json schema."
+msgstr "Naam van het json schema."
+
+#: models.py:14
+msgid "schema"
+msgstr ""
+
+#: models.py:14
+msgid "The schema that can be validated against."
+msgstr "Het schema waartegen gevalideerd kan worden."
+
+#: models.py:18
+msgid "Json schema"
+msgstr ""
+
+#: models.py:19
+msgid "Json Schemas"
+msgstr "Json Schema's"

django_json_schema/migrations/0001_initial.py

@@ -0,0 +1,45 @@
+# Generated by Django 4.2.17 on 2025-01-03 16:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="JsonSchema",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "name",
+                    models.CharField(
+                        help_text="Name of the json schema.",
+                        max_length=200,
+                        verbose_name="name",
+                    ),
+                ),
+                (
+                    "schema",
+                    models.JSONField(
+                        help_text="The schema that can be validated against.",
+                        verbose_name="schema",
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Json schema",
+                "verbose_name_plural": "Json Schemas",
+            },
+        ),
+    ]

django_json_schema/models.py

@@ -0,0 +1,38 @@
+from django.core.exceptions import ValidationError
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+from jsonschema import Draft202012Validator, validate
+from jsonschema.exceptions import (
+    SchemaError,
+    ValidationError as JsonSchemaValidationError,
+)
+
+
+class JsonSchema(models.Model):
+    name = models.CharField(
+        _("name"), help_text=_("Name of the json schema."), max_length=200
+    )
+
+    schema = models.JSONField(
+        _("schema"), help_text=_("The schema that can be validated against.")
+    )
+
+    class Meta:
+        verbose_name = _("Json schema")
+        verbose_name_plural = _("Json Schemas")
+
+    def __str__(self):
+        return self.name
+
+    def clean(self):
+        try:
+            Draft202012Validator.check_schema(self.schema)
+        except SchemaError as e:
+            raise ValidationError(e.message)
+
+    def validate(self, json: dict) -> None:
+        try:
+            validate(json, self.schema, cls=Draft202012Validator)
+        except JsonSchemaValidationError as e:
+            raise ValidationError(e.message)

docs/index.rst

@@ -10,13 +10,15 @@ Welcome to django-json-schema's documentation!
 ..
    |docs| |python-versions| |django-versions| |pypi-version|
 
-<One liner describing the project>
+A reusable Django app to store JSON schemas.
 
 Features
 ========
 
-* ...
-* ...
+* JsonSchemaModel consisting of
+    - name CharField
+    - schema JsonField
+    - validate(json) method to validate JSON against the schema.
 
 .. toctree::
    :maxdepth: 2

docs/quickstart.rst

@@ -15,4 +15,17 @@ Install from PyPI with pip:
 Usage
 =====
 
-<document how to use the app here>
+.. code-block:: python
+
+    from django.db import models
+    from django_json_schema.models import JsonSchema
+
+    class ProductType(models.Model):
+        schema = models.ForeignKey(JsonSchema, on_delete=models.PROTECT)
+
+    class Product(models.Model):
+        json = models.JsonField()
+        type = models.ForeignKey(ProductType, on_delete=models.CASCADE)
+
+        def clean(self):
+            self.type.schema.validate(self.json)

manage.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ["DJANGO_SETTINGS_MODULE"] = "testapp.settings"
+
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)

pyproject.toml

@@ -27,7 +27,8 @@ classifiers = [
 ]
 requires-python = ">=3.10"
 dependencies = [
-    "django>=4.2"
+    "django>=4.2",
+    "jsonschema>=4.23",
 ]
 
 [project.urls]

tests/test_json_schema.py

@@ -0,0 +1,43 @@
+from django.core.exceptions import ValidationError
+from django.test import TestCase
+
+from django_json_schema.models import JsonSchema
+
+
+class TestJsonSchema(TestCase):
+    def setUp(self):
+        self.schema = JsonSchema.objects.create(
+            name="schema",
+            schema={
+                "type": "object",
+                "properties": {
+                    "price": {"type": "number"},
+                    "name": {"type": "string"},
+                },
+                "required": ["price", "name"],
+            },
+        )
+
+    def test_valid_json(self):
+        self.schema.validate(
+            {
+                "price": 10,
+                "name": "test",
+            }
+        )
+
+    def test_invalid_json(self):
+        with self.assertRaisesMessage(
+            ValidationError, "'price' is a required property"
+        ):
+            self.schema.validate({"name": "Eggs"})
+
+    def test_clean_with_invalid_schema(self):
+        self.schema.schema = {"type": []}
+        with self.assertRaisesMessage(
+            ValidationError, "[] is not valid under any of the given schemas"
+        ):
+            self.schema.clean()
+
+    def test_clean_with_valid_schema(self):
+        self.schema.clean()