diff --git a/app/serializers/application.js b/app/serializers/application.js
index e20e6a5..3af4362 100644
--- a/app/serializers/application.js
+++ b/app/serializers/application.js
@@ -46,6 +46,11 @@ export default DS.RESTSerializer.extend({
         }
       }
     }, this);
+
+    // run legacy support transformation specified in model serializer
+    if (typeof this.legacySupport === 'function') {
+      resourceHash = this.legacySupport(resourceHash);
+    }
     
     return this._super(modelClass, resourceHash, prop);
   },
diff --git a/app/serializers/poll.js b/app/serializers/poll.js
index 40b149d..c21e2eb 100644
--- a/app/serializers/poll.js
+++ b/app/serializers/poll.js
@@ -1,10 +1,27 @@
 import DS from "ember-data";
 import ApplicationAdapter from './application';
+import Ember from "ember";
 
 export default ApplicationAdapter.extend(DS.EmbeddedRecordsMixin, {
   attrs: {
     users: {
       deserialize: 'records'
     }
+  },
+
+  legacySupport(resourceHash) {
+    // croodle <= 0.3.0
+    // property "type" of answers was named "id"
+    if (
+      resourceHash.answers.length > 0 &&
+      !Ember.isEmpty(resourceHash.answers[0].id)
+    ) {
+      resourceHash.answers.forEach((answer, index) => {
+        resourceHash.answers[index].type = answer.id;
+        delete resourceHash.answers[index].id;
+      });
+    }
+
+    return resourceHash;
   }
 });
diff --git a/app/serializers/user.js b/app/serializers/user.js
new file mode 100644
index 0000000..a3be521
--- /dev/null
+++ b/app/serializers/user.js
@@ -0,0 +1,33 @@
+import ApplicationAdapter from './application';
+import Ember from 'ember';
+
+export default ApplicationAdapter.extend({
+  legacySupport: function(resourceHash) {
+    /*
+     * Croodle <= 0.3.0:
+     * * for answer type "freetext":
+     *   selections where a string containing label
+     * * all other answer types ("YesNo", "YesNoMaybe"):
+     *   selections where stored as child object of "value" property
+     *   and selection property "type" where named "id"
+     */
+    if (!Ember.isEmpty(resourceHash.selections[0].value)) {
+      resourceHash.selections.forEach(function(selection, index) {
+        if (typeof selection.value === 'string') {
+          resourceHash.selections[index] = {
+            label: selection.value
+          };
+        } else {
+          resourceHash.selections[index] = {
+            icon: selection.value.icon,
+            label: selection.value.label,
+            labelTranslation: selection.value.labelTranslation,
+            type: selection.value.id
+          };
+        }
+      });
+    }
+    
+    return resourceHash;
+  }
+});