Fix field hook for HTTP PUT

Always calls `OnUpdate` field hook on HTTP PUT for existing documents.

Author: Dragomir-Ivanov

README.md

@@ -89,6 +89,7 @@ Below is an overview over recent breaking changes, starting from an arbitrary po
   - `filter` parameters will be validated for type match only, instead of type & constrains.
 - PR #228: `Reference` projection fields will be validated against referenced resource schema.
 - PR #230: `Connection` projection fields will be validated against connected resource schema.
+- PR #241: Always call `OnUpdate` field hook on HTTP PUT for existing documents.
 
 From the next release and onwards (0.2), this list will summarize breaking changes done to master since the last release.
 

schema/schema.go

@@ -188,7 +188,7 @@ func (s Schema) Prepare(ctx context.Context, payload map[string]interface{}, ori
 		// Call the OnInit or OnUpdate depending on the presence of the original doc and the
 		// state of the replace argument.
 		var hook func(ctx context.Context, value interface{}) interface{}
-		if original == nil || replace {
+		if original == nil {
 			hook = def.OnInit
 		} else {
 			hook = def.OnUpdate