Document PolymorphicEmbed.get_polymorphic_module/3

README.md

@@ -246,7 +246,7 @@ You may use `PolymorphicEmbed.HTML.Component.polymorphic_embed_inputs_for/1` whe
 </.form>
 ```
 
-### Get the type of a polymorphic embed
+### Get the type and module of a polymorphic embed
 
 Sometimes you need to serialize the polymorphic embed and, once in the front-end, need to distinguish them.
 `PolymorphicEmbed.get_polymorphic_type/3` returns the type of the polymorphic embed:
@@ -255,6 +255,12 @@ Sometimes you need to serialize the polymorphic embed and, once in the front-end
 PolymorphicEmbed.get_polymorphic_type(Reminder, :channel, SMS) == :sms
 ```
 
+To get the module for a specific type, use:
+
+```elixir
+PolymorphicEmbed.get_polymorphic_module(Reminder, :channel, :sms) == SMS
+```
+
 ### `traverse_errors/2`
 
 The function `Ecto.changeset.traverse_errors/2` won't include the errors of polymorphic embeds. You may instead use `PolymorphicEmbed.traverse_errors/2` when working with polymorphic embeds.