At Universal Containers (UC), a developer named Yuichiro wrote a PHP application that, in production, uses a MySQL database. Yuichiro is onboarding Mary, a new UC developer, who is setting up her development environment. Yuichiro asks Mary to:
1) install the related PHP libraries manually so the application will run; 2) use MongoDB, instead of MySQL, in the development environment.
According to the Twelve-Factor methodology, which changes should an Architect recommend?

Question

At Universal Containers (UC), a developer named Yuichiro wrote a PHP application that, in production, uses a MySQL database. Yuichiro is onboarding Mary, a new UC developer, who is setting up her development environment. Yuichiro asks Mary to:

1) install the related PHP libraries manually so the application will run; 2) use MongoDB, instead of MySQL, in the development environment.

According to the Twelve-Factor methodology, which changes should an Architect recommend?

Hamid Assimi · Accepted Answer

Persist code dependencies in the application's production database. Use the same type of database locally to ensure that the dependencies are accessible.

Hamid Assimi · Answer

Explicitly declare code dependencies in the application's environment variables and use the same type of database in both development and production.

Hamid Assimi · Answer

Recursively determine code dependencies on application startup and maintain separate Git branches for the MongoDB- and MySQL- compatible versions of the application.

Hamid Assimi · Answer

Explicitly declare code dependencies in the application's source and use the same type of database in both development and production.

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