Django: Getting Started Transcripts
Chapter: Course conclusion
Lecture: Data object models
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Django comes with an ORM. That's object relational mapping, an abstraction layer that sits on top of your database.
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It allows you to think about a group of objects rather than the underlying tables the information is stored in.
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You create a data model object by inheriting from Djangos db.models.model class and declare fields which get mapped to columns in the database.
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Django provides dozens of different field types and allows you to create foreign keys and many to many relationships between your models.
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Some of the fields will even auto generate their content like a date time stamp.
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You can further control how your data objects behave through the use of an inner class called meta. Within this class,
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you can configure things like the default order of query results as well as how Django will refer to objects of this type inside of the admin web tool.
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Speaking of the admin web tool, you can overload the dunder string method to make the objects appearance in the tool be
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whatever makes the most sense for your project. A lot of the work you do in a web application is simply CRUD,
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that's create, read, update and delete the four operations you need on your data objects.
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To help you manage these operations, Django comes with an admin web tool that acts as a gooey interface to your ORM. With very little extra code,
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you can create, view, edit and delete all of your data objects and their relations
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You register a data object with the admin tool by declaring a model admin object in admin.py.
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These classes also provide ways of changing the display of the various screens in the admin that relate to this object,
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thus allowing you to customize what fields are shown in the object listing and provide links to other objects in the interface.