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将对象转储为 JSON

序列化单个项目和集合

将对象转储为 JSON 是 CoddyKit 上的免费 Flask Academy 课时。这是第 3 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Dumping Defined

Turning a model object into plain JSON-ready data is called dumping. The schema reads your object and emits a clean dict.

Call dump

Pass your object to the schema's dump method. It returns a dictionary containing only the fields you declared, properly typed.

result = user_schema.dump(user)

A Plain Dict Comes Back

The output of dump is an ordinary Python dict, not JSON text yet. That dict is exactly what jsonify happily turns into a response.

Pair with jsonify

Hand the dumped dict to Flask's jsonify to get a real response with the right content type and proper formatting.

return jsonify(user_schema.dump(user))

Serialize Many at Once

Have a list of objects? Create the schema with many=True and dump returns a list of dicts in one tidy call.

UserSchema(many=True).dump(users)

Reuse with the many Flag

You can also pass many=True straight to dump on an existing instance, so one schema serves both single and list endpoints.

user_schema.dump(users, many=True)

Nested Objects Flow Through

Declare a Nested field and dump walks into related objects too. One call serializes a user and all of their posts together.

posts = fields.Nested(PostSchema, many=True)

Dates Format Themselves

Because you used a DateTime field, dump renders it as an ISO string with no extra work. Consistent timestamps come for free.

Only Declared Fields Appear

Dump ignores anything not in the schema. Internal attributes like password_hash simply never show up, so your output stays safe.

Dump Never Validates

Remember that dump trusts your objects and does no validation. It is purely about output; checking input is the job of load.

A Complete View

Put it together: query the model, dump it, jsonify it, return it. That short pipeline replaces all those fragile hand-built dicts.

return jsonify(schema.dump(query_result))

Quick Check

You need to serialize a list of user objects.

Recap

Use dump to turn objects into JSON-ready dicts, add many=True for lists, and let Nested fields handle relations. Then jsonify and return.

常见问题解答

「将对象转储为 JSON」课时是免费的吗？

是的 — 「将对象转储为 JSON」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「将对象转储为 JSON」这节课中我会学到什么？

序列化单个项目和集合你通过在浏览器中直接运行的动手代码来练习 Flask Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 3 节课，共 4 节。

「将对象转储为 JSON」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flask Academy 课中编写并运行代码吗？

能。每节 Flask Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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