improvement: honor repo configs and add snapshot configs

closes #104

Author: zachdaniel

lib/migration_generator/migration_generator.ex

@@ -138,8 +138,15 @@ defmodule AshSqlite.MigrationGenerator do
     # Copied from ecto's mix task, thanks Ecto ❤️
     config = repo.config()
 
-    app = Keyword.fetch!(config, :otp_app)
-    Path.join([Mix.Project.deps_paths()[app] || File.cwd!(), "priv", "resource_snapshots"])
+    if snapshot_path = config[:snapshots_path] do
+      snapshot_path
+    else
+      priv =
+        config[:priv] || "priv/#{repo |> Module.split() |> List.last() |> Macro.underscore()}"
+
+      app = Keyword.fetch!(config, :otp_app)
+      Application.app_dir(app, Path.join(priv, "resource_snapshots"))
+    end
   end
 
   defp create_extension_migrations(repos, opts) do
@@ -655,18 +662,18 @@ defmodule AshSqlite.MigrationGenerator do
   end
 
   defp migration_path(opts, repo) do
-    repo_name = repo_name(repo)
     # Copied from ecto's mix task, thanks Ecto ❤️
     config = repo.config()
     app = Keyword.fetch!(config, :otp_app)
 
-    if opts.migration_path do
-      opts.migration_path
+    if path = opts.migration_path || config[:tenant_migrations_path] do
+      path
     else
-      Path.join([Mix.Project.deps_paths()[app] || File.cwd!(), "priv"])
+      priv =
+        config[:priv] || "priv/#{repo |> Module.split() |> List.last() |> Macro.underscore()}"
+
+      Application.app_dir(app, Path.join(priv, "migrations"))
     end
-    |> Path.join(repo_name)
-    |> Path.join("migrations")
   end
 
   defp repo_name(repo) do

lib/repo.ex

@@ -7,6 +7,15 @@ defmodule AshSqlite.Repo do
   You can use `Ecto.Repo`'s `init/2` to configure your repo like normal, but
   instead of returning `{:ok, config}`, use `super(config)` to pass the
   configuration to the `AshSqlite.Repo` implementation.
+
+  ## Additional Repo Configuration
+
+  Because an `AshPostgres.Repo` is also an `Ecto.Repo`, it has all of the same callbacks.
+
+  In the `c:Ecto.Repo.init/2` callback, you can configure the following additional items:
+
+  - `:tenant_migrations_path` - The path where your tenant migrations are stored (only relevant for a multitenant implementation)
+  - `:snapshots_path` - The path where the resource snapshots for the migration generator are stored.
   """
 
   @doc "Use this to inform the data layer about what extensions are installed"