fix: improve error message on v-model when using dot notation

Author: adrienbaron

processors/src/main/java/com/axellience/vuegwt/processors/component/template/parser/TemplateParser.java

@@ -404,8 +404,13 @@ private void processVModel(Attribute vModelAttribute) {
     String vModelValue = vModelAttribute.getValue();
     VariableInfo vModelDataField = context.findRootVariable(vModelValue);
     if (vModelDataField == null) {
-      logger.error("Couldn't find @Data or @Computed for v-model \"" + vModelValue
-          + "\". V-Model is only supported on @Data and @Computed.");
+      if (vModelValue.contains(".")) {
+        logger.error("v-model doesn't support dot notation in Vue GWT: \"" + vModelValue
+            + "\". Try using a @Computed with a getter and a setter. Check our documentation on v-model for more information.");
+      } else {
+        logger.error("Couldn't find @Data or @Computed for v-model \"" + vModelValue
+            + "\". V-Model is only supported on @Data and @Computed. Check our documentation on v-model for more information.");
+      }
       return;
     }
 

processors/src/test/java/com/axellience/vuegwt/processors/component/vmodel/VModelTest.java

@@ -23,4 +23,17 @@ void vmodelWithInvalidField() {
     assertThat(compilation).hadErrorContaining(
         "Couldn't find @Data or @Computed for v-model \"nonExistingField\"");
   }
+
+  @Test
+  @DisplayName("should throw an error when using a v-model with dot notation")
+  void vmodelWithDotNotation() {
+    Compilation compilation =
+        javac()
+            .withProcessors(new VueGwtProcessor())
+            .compile(
+                JavaFileObjects.forResource("vmodel/VModelDotNotationComponent.java"));
+
+    assertThat(compilation).hadErrorContaining(
+        "v-model doesn't support dot notation in Vue GWT: \"dot.notation\"");
+  }
 }

processors/src/test/resources/vmodel/VModelDotNotationComponent.html

@@ -0,0 +1,3 @@
+<div>
+  <input type="text" v-model="dot.notation">
+</div>

processors/src/test/resources/vmodel/VModelDotNotationComponent.java

@@ -0,0 +1,8 @@
+package vmodel;
+
+import com.axellience.vuegwt.core.annotations.component.Component;
+import com.axellience.vuegwt.core.client.component.IsVueComponent;
+
+@Component
+public class VModelDotNotationComponent implements IsVueComponent {
+}