2 files changed, 32 insertions, 9 deletions
diff --git a/src/client/Update/Payment.elm b/src/client/Update/Payment.elm
index 136f0f9..2d558fd 100644
--- a/src/client/Update/Payment.elm
+++ b/src/client/Update/Payment.elm
@@ -6,22 +6,22 @@ module Update.Payment
 import Date
 
 import Model exposing (Model)
-import Model.View.PaymentView exposing (..)
 import Model.Payment exposing (..)
+import Model.View.PaymentView exposing (..)
+import Model.View.Payment.Add exposing (..)
+
+import Update.Payment.Add exposing (..)
 
 type PaymentAction =
-  UpdateName String
-  | UpdateCost String
+  UpdateAdd AddPaymentAction
   | UpdatePayments Payments
   | AddPayment String Int
 
 updatePayment : Model -> PaymentAction -> PaymentView -> PaymentView
 updatePayment model action paymentView =
   case action of
-    UpdateName name ->
-      { paymentView | name <- name }
-    UpdateCost cost ->
-      { paymentView | cost <- cost }
+    UpdateAdd addPaymentAction ->
+      { paymentView | add <- updateAddPayment addPaymentAction paymentView.add }
     UpdatePayments payments ->
       { paymentView | payments <- payments }
     AddPayment name cost ->
@@ -33,6 +33,5 @@ updatePayment model action paymentView =
             }
       in  { paymentView
           | payments <- payment :: paymentView.payments
-          , name <- ""
-          , cost <- ""
+          , add <- initAddPayment
           }
diff --git a/src/client/Update/Payment/Add.elm b/src/client/Update/Payment/Add.elm
new file mode 100644
index 0000000..3ccce73
--- /dev/null
+++ b/src/client/Update/Payment/Add.elm
@@ -0,0 +1,24 @@
+module Update.Payment.Add
+  ( AddPaymentAction(..)
+  , updateAddPayment
+  ) where
+
+import Model.View.Payment.Add exposing (AddPayment)
+
+type AddPaymentAction =
+  UpdateName String
+  | UpdateCost String
+  | AddError (Maybe String) (Maybe String)
+
+updateAddPayment : AddPaymentAction -> AddPayment -> AddPayment
+updateAddPayment action addPayment =
+  case action of
+    UpdateName name ->
+      { addPayment | name <- name }
+    UpdateCost cost ->
+      { addPayment | cost <- cost }
+    AddError nameError costError ->
+      { addPayment
+      | nameError <- nameError
+      , costError <- costError
+      }