Fixes #37: Fields in embedded struct should always be shadowed by fie…

…lds in outer struct

struct.go

@@ -188,10 +188,13 @@ func (si *structInfo) build(a reflect.Type, path []int, namePrefix, dbNamePrefix
 				dbName: concat(dbNamePrefix, dbName),
 				path:   path2,
 			}
-			si.nameMap[fi.name] = fi
-			si.dbNameMap[fi.dbName] = fi
-			if isPK {
-				si.pkNames = append(si.pkNames, fi.name)
+			// a field in an anonymous struct may be shadowed
+			if _, ok := si.nameMap[fi.name]; !ok || len(path2) < len(si.nameMap[fi.name].path) {
+				si.nameMap[fi.name] = fi
+				si.dbNameMap[fi.dbName] = fi
+				if isPK {
+					si.pkNames = append(si.pkNames, fi.name)
+				}
 			}
 		}
 	}

struct_test.go

@@ -92,6 +92,30 @@ func Test_structValue_columns(t *testing.T) {
 	assert.Equal(t, map[string]interface{}{"Name": "abc"}, cols)
 }
 
+func TestIssue37(t *testing.T) {
+	customer := Customer{
+		ID:     1,
+		Name:   "abc",
+		Status: 2,
+		Email:  "[email protected]",
+	}
+	ev := struct{
+		Customer
+		Status string
+	} {customer, "20"}
+	sv := newStructValue(&ev, nil)
+	cols := sv.columns([]string{"ID", "Status"}, nil)
+	assert.Equal(t, map[string]interface{}{"ID": 1, "Status": "20"}, cols)
+
+	ev2 := struct{
+		Status string
+		Customer
+	} {"20", customer}
+	sv = newStructValue(&ev2, nil)
+	cols = sv.columns([]string{"ID", "Status"}, nil)
+	assert.Equal(t, map[string]interface{}{"ID": 1, "Status": "20"}, cols)
+}
+
 type MyCustomer struct{}
 
 func Test_getTableName(t *testing.T) {