Started Tutorial: Serialization; Created model snippet, and related serializer class, didn't successfully develop test case

src/snippets/admin.py

@@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.

src/snippets/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class SnippetsConfig(AppConfig):
+    name = 'snippets'

src/snippets/models.py

@@ -0,0 +1,21 @@
+# from django.db.models.fields import BLANK_CHOICE_DASH
+# from src.tutorial.settings import LANGUAGE_CODE
+from django.db import models
+from pygments.lexers import get_all_lexers
+from pygments.styles import get_all_styles
+
+LEXERS = [item for item in get_all_lexers() if item[1]] # 词法分析程序
+LANGUAGE_CHOICES = sorted([(item[1][0], item[0]) for item in LEXERS])
+STYLE_CHOICES = sorted([(item, item) for item in get_all_styles()])
+
+
+class Snippet(models.Model):
+    created = models.DateTimeField(auto_now_add=True)
+    title = models.CharField(max_length=100, blank=True, default='')
+    code = models.TextField()
+    linenos = models.BooleanField(default=False)
+    language = models.CharField(choices=LANGUAGE_CHOICES, default='python', max_length=100)
+    style = models.CharField(choices=STYLE_CHOICES, default='friendly', max_length=100)
+
+    class Meta:
+        ordering = ['created']

src/snippets/serializers.py

@@ -0,0 +1,36 @@
+from rest_framework import serializers
+from snippets.models import Snippet, LANGUAGE_CHOICES, STYLE_CHOICES
+
+
+class SnippetSerializer(serializers.Serializer):
+    """
+    Provide a way of serializing/deserializing the snippet instance into representations such as json.
+    """
+
+    # Define fields that get serialized/deserialized
+    id = serializers.IntegerField(read_only=True)
+    title = serializers.CharField(required=False, allow_blank=True, max_length=100)
+    code = serializers.CharField(style={'base_template': 'textarea.html'})
+    linenos = serializers.BooleanField(required=False)
+    language = serializers.ChoiceField(choices=LANGUAGE_CHOICES, default='python')
+    style = serializers.ChoiceField(choices=STYLE_CHOICES, default='friendly')
+
+    # `create()` & `update()` define how fully fledged instances are created/modified when calling serializer.save()`
+
+    def create(self, validated_data):
+        """
+        Create and return a new `Snippet` instance, given the validated data.
+        """
+        return Snippet.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        """
+        Update and return an existing `Snippet` instance, given the validated data.
+        """
+        instance.title = validated_data.get('title', instance.title)
+        instance.code = validated_data.get('code', instance.code)
+        instance.linenos = validated_data.get('linenos', instance.linenos)
+        instance.language = validated_data.get('language', instance.language)
+        instance.style = validated_data.get('style', instance.style)
+        instance.save()
+        return instance

src/snippets/tests.py

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+from django.test import TestCase
+from rest_framework.renderers import JSONRenderer
+from rest_framework.parsers import JSONParser
+
+from .models import Snippet
+from .serializers import SnippetSerializer
+
+# class SerializerTests(TestCase):
+
+#     def test_serializer_work(self):
+        
+#         snippet = Snippet(code='foo = "bar"\n')
+#         snippet.save()
+#         snippet = Snippet(code='print("hello, world")\n')
+#         snippet.save()
+
+#         serializer = SnippetSerializer(snippet)
+#         content = JSONRenderer().render(serializer.data)
+
+#         # self.assertEqual(type(content), b'{"id": 2, "title": "", "code": "print(\\"hello, world\\")\\n", "linenos": false, "language": "python", "style": "friendly"}')
+
+#         self.assertEqual(type(content), True)

src/snippets/views.py

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+from django.shortcuts import render
+
+# Create your views here.

src/tutorial/settings.py

@@ -38,7 +38,9 @@ INSTALLED_APPS = [
     'django.contrib.messages',
     'django.contrib.staticfiles',
     # 3rd party
-    'rest_framework'
+    'rest_framework',
+    # 1st party
+    'snippets.apps.SnippetsConfig',
 ]
 
 MIDDLEWARE = [