Instruction: Explain how to design and implement a multi-tenant application using Django, including data isolation strategies.
Context: This question evaluates the candidate's ability to architect applications in Django that can efficiently segregate and manage data for multiple clients or users.
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Initially, it's paramount to clarify our approach to multi-tenancy in Django; namely, are we adopting a shared database, shared schema approach, a separate schema for each tenant, or completely isolating tenants at the database level? My preferred method, based on robustness and scalability, is the separate schema for each tenant. This strategy, while slightly more complex to implement, offers excellent data isolation and security, making it ideal for applications with stringent data protection requirements.
To begin with, assuming we're adopting the separate schema approach, one of the first steps is to use Django's DATABASE_ROUTERS option to route database operations for different tenants to the appropriate schema. This involves defining a custom database router that inspects the request (or context) to determine the current tenant and dynamically sets the database schema...