`add_model_state` is a method in the `ProjectState` class of the `django.db.migrations.state` module in Python Django.
This method allows adding a new model state to the project state. A model state represents the schema of a particular model in the database. The `add_model_state` method is used during the process of applying migrations to keep track of changes made to the models and their corresponding database tables.
By calling `add_model_state`, developers can update the project state with the latest changes made to the model, such as adding new fields, modifying existing fields, or deleting fields from the model's schema. This ensures that the database schema remains synchronized with the model definitions, enabling proper migration and data consistency in the application.
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