fix: handle missing ex_money_sql better

documentation/tutorials/get-started-with-ash-money.md

@@ -33,6 +33,8 @@ attribute :balance, :money
 
 ## AshPostgres Support
 
+Add the `:ex_money_sql` dependency to your `mix.exs` file.
+
 Thanks to `ex_money_sql`, there are excellent tools for lowering support for money into your postgres database. This allows for things like aggregates that sum amounts, and referencing money in expressions:
 
 ```elixir

lib/ash_money/types/money.ex

@@ -10,11 +10,18 @@ defmodule AshMoney.Types.Money do
       storage_type: [
         type: :atom,
         default: :money_with_currency,
-        doc: "The storage type for the money value. Can be `:money_with_currency` or `:map`."
+        doc:
+          "The storage type for the money value. Can be `:money_with_currency` or `:map`. There is no difference between the two unless `ex_money_sql` is installed."
       ]
     ]
   end
 
+  @composite_type if(Code.ensure_loaded?(Money.Ecto.Composite.Type)) do
+    Money.Ecto.Composite.Type
+  else
+    Money.Ecto.Map.Type
+  end
+
   @impl true
   def cast_in_query?(constraints) do
     Keyword.get(constraints, :storage_type, :money_with_currency) == :money_with_currency
@@ -43,7 +50,7 @@ defmodule AshMoney.Types.Money do
     if constraints[:storage_type] == :map do
       Money.Ecto.Map.Type.cast(value)
     else
-      Money.Ecto.Composite.Type.cast(value)
+      @composite_type.cast(value)
     end
   end
 
@@ -52,7 +59,7 @@ defmodule AshMoney.Types.Money do
   def cast_stored(%Money{} = value, _), do: {:ok, value}
 
   def cast_stored({_amount, _currency} = value, _constraints),
-    do: Money.Ecto.Composite.Type.load(value)
+    do: @composite_type.load(value)
 
   def cast_stored(value, _constraints) do
     Money.Ecto.Map.Type.load(value)
@@ -72,7 +79,7 @@ defmodule AshMoney.Types.Money do
     if constraints[:storage_type] == :map do
       Money.Ecto.Map.Type.dump(value)
     else
-      Money.Ecto.Composite.Type.dump(value)
+      @composite_type.dump(value)
     end
   end
 

mix.exs

@@ -144,7 +144,7 @@ defmodule AshMoney.MixProject do
     [
       {:ash, ash_version("~> 2.0")},
       {:ex_money, "~> 5.15"},
-      {:ex_money_sql, "~> 1.0", optional: true},
+      {:ex_money_sql, "~> 1.0"},
       {:ex_doc, github: "elixir-lang/ex_doc", only: [:dev, :test], runtime: false},
       {:ex_check, "~> 0.12", only: [:dev, :test]},
       {:credo, ">= 0.0.0", only: [:dev, :test], runtime: false},