Add a --context-app for umbrella with a dedicated database app

Hello.

First of all, thanks for the lib! I hesitated to open an issue directly in the phoenix repo, but as it doesn't seem like both and neither a feature nor a bug, I didn't know where to put it, so here it is. Sorry if it misplaced.

When creating an umbrella project with multiple app depending of the same Database, I use a vanilla app with Ecto as a base app for the database through the option: --context-app.

mix phx.gen.schema Users.User users email:string password:string --context-app database

This allow each app to depend only from the specific DB instead of another one, as it place the context in a shared app.

Unfortunately, when running the phx.gen.auth cli, there is no option to indicate the place of the Repo module, forcing to have a Repo is the app where we want the auth.

Edit 2021/09/07: After some research, I found the possibility to do so by using the following config:

config :my_app_web, :generators,
  context_app: :my_app

Though it isn't documented.

The code modification associated with the add of the --context-app is 1 line in the @switches in the \lib\mix\tasks\phx.gen.auth.ex:84 file.

  @switches [
    web: :string,
    binary_id: :boolean,
    hashing_lib: :string,
    table: :string,
    merge_with_existing_context: :boolean,
    prefix: :string,
    context_app: :string
  ]

Unfortunately, and though the test was working fine alone, I couldn't manage to make it work in bulk as the mix.exs was remove from the folder due to another test.

aaronrenner / phx_gen_auth

Add a --context-app for umbrella with a dedicated database app #128