The problem of adding authentication to a Phoenix application can be solved using the phx.gen.auth generator, which provides a simple way to generate authentication for an application.
First, we need to create a new Phoenix application and update the dependencies. Then, we can run the phx.gen.auth generator to create the necessary files and update the existing ones.
Next, we need to update the database credentials and configure the database to reflect the changes made by the phx.gen.auth generator.
After that, we can add authentication to our routes by putting them behind the :requireauthenticateduser plug.
Finally, we can test the authentication by logging out of the application and trying to access the protected routes.
Overall, the phx.gen.auth generator provides a straightforward solution to adding authentication to a Phoenix application.