Data Persistence

It makes sense that validated and processed data can be serialized and persisted. Currently JSONClasses supports MongoDB integration with pymongo. SQL and other no-SQL databases will be supported in the future.

MongoDB has the most natural way to save JSON data. To support saving objects into MongoDB, simply add a pymongo magical decorator and a primary field.

@pymongo@jsonclassclass Article:    id: str = types.readonly.str.primary.mongoid.required    title: str    content: str    author: User = types.objof('User').linkto.required

The usage of the object is barely the same, except there is some additional attributes and an additional method named save. By calling it, the validation process is triggered, then the serialization process is triggered. After these two stages are passed, the object and it's modified linked objects are serialized into database. article = Article(title='My Article', content='Article Content...', author=current_user)article.save() # article and user are saved into the database

Timestamps

You may want timestamp fields like created_at and updated_at. It's simple to write them on your own.

@pymongo@jsonclassclass Article:    id: str = types.readonly.str.primary.mongoid.required    title: str    content: str    author: User = types.objof('User').linkto.required    created_at: datetime = types.readonly.datetime.tscreated.required    updated_at: datetime = types.readonly.datetime.tsupdated.required

Custom Database Table Name

You can pass configurations to @pymongo just like how we can do to jsonclass. By default, the database table name is the pluralized and lowercased class name.

@pymongo(collection_name='myarticles')@jsonclassclass Article:    id: str = types.readonly.str.primary.mongoid.required    title: str    content: str    author: User = types.objof('User').linkto.required    created_at: datetime = types.readonly.datetime.tscreated.required    updated_at: datetime = types.readonly.datetime.tsupdated.required

Object Key Encoding Strategy

By default, object keys are camelized and serialized into MongoDB. You can disable this behavior.

@pymongo(camelize_db_keys=False)@jsonclassclass Article:    id: str = types.readonly.str.primary.mongoid.required    title: str    content: str    author: User = types.objof('User').linkto.required    created_at: datetime = types.readonly.datetime.tscreated.required    updated_at: datetime = types.readonly.datetime.tsupdated.required

Connecting the Database

At the beginning of your server's app.py, add this line. Passing your url and authentication settings into the connection configuration.

Connection.default.set_url('mongodb://localhost:27017/yourdb')