Adding guides on using array enums. Fixes #1296

src/actions/guides/database/models.cr

@@ -376,6 +376,37 @@ class Guides::Database::Models < GuideAction
     end
     ```
 
+    ### Array Enums
+
+    For `Array(SomeEnum)` columns, you will store these on the postgres side as array of ints. Then on the model side, you must
+    use the `PG::EnumArrayConverter` custom converter.
+
+    ```crystal
+    # Use this for your migrations
+    create table_for(Post) do
+      primary_key id : Int64
+
+      add reactions : Array(Int32), default: [] of Int32
+    end
+    ```
+
+    ```crystal
+    # src/models/post.cr
+    class Post < BaseModel
+
+      enum Reaction
+        Like
+        Love
+        Funny
+        Shocked
+      end
+
+      table do
+        column reactions : Array(Reaction) = [] of Post::Reaction, converter: PG::EnumArrayConverter(Post::Reaction)
+      end
+    end
+    ```
+
     To learn more about using enums, read up on [saving with enums](#{Guides::Database::SavingRecords.path(anchor: Guides::Database::SavingRecords::ANCHOR_SAVING_ENUMS)})
     and [querying with enums](#{Guides::Database::Querying.path(anchor: Guides::Database::Querying::ANCHOR_QUERYING_ENUMS)}).
 

src/actions/guides/database/querying.cr

@@ -401,12 +401,21 @@ class Guides::Database::Querying < GuideAction
         Admin
       end
 
-      #...
+      enum Color
+        Red
+        Blue
+        Green
+        Yellow
+      end
+
+      column role : User::Role
+      column colors : Array(User::Color)
     end
     ```
 
     ```crystal
     UserQuery.new.role(User::Role::Admin)
+    UserQuery.new.colors.includes(User::Color::Green)
     ```
 
     ### Any? / None?