The 'ProjectState' class in Django's 'django.db.migrations.state' module represents the state of a database schema for a Django project. It stores information about all the installed applications, their models, and their corresponding database tables. This class is used during migrations to track the current state of the project's database and to make any necessary changes to the schema. It provides methods to retrieve and update information about the project's models, fields, indexes, constraints, and database dependencies. The 'ProjectState' class acts as a central source of truth for managing the database schema in a Django project.
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