add tests for scannable slice support

slice_test.go

@@ -0,0 +1,70 @@
+package gorm_test
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"testing"
+)
+
+func TestScannableSlices(t *testing.T) {
+	if err := DB.AutoMigrate(&RecordWithSlice{}).Error; err != nil {
+		t.Errorf("Should create table with slice values correctly: %s", err)
+	}
+
+	r1 := RecordWithSlice{
+		Strings: ExampleStringSlice{"a", "b", "c"},
+		Structs: ExampleStructSlice{
+			{"name1", "value1"},
+			{"name2", "value2"},
+		},
+	}
+
+	if err := DB.Save(&r1).Error; err != nil {
+		t.Errorf("Should save record with slice values")
+	}
+
+	var r2 RecordWithSlice
+
+	if err := DB.Find(&r2).Error; err != nil {
+		t.Errorf("Should fetch record with slice values")
+	}
+
+	if len(r2.Strings) != 3 || r2.Strings[0] != "a" || r2.Strings[1] != "b" || r2.Strings[2] != "c" {
+		t.Errorf("Should have serialised and deserialised a string array")
+	}
+
+	if len(r2.Structs) != 2 || r2.Structs[0].Name != "name1" || r2.Structs[0].Value != "value1" || r2.Structs[1].Name != "name2" || r2.Structs[1].Value != "value2" {
+		t.Errorf("Should have serialised and deserialised a struct array")
+	}
+}
+
+type RecordWithSlice struct {
+	ID      uint64
+	Strings ExampleStringSlice `sql:"type:text"`
+	Structs ExampleStructSlice `sql:"type:text"`
+}
+
+type ExampleStringSlice []string
+
+func (l ExampleStringSlice) Value() (driver.Value, error) {
+	return json.Marshal(l)
+}
+
+func (l *ExampleStringSlice) Scan(input interface{}) error {
+	return json.Unmarshal(input.([]byte), l)
+}
+
+type ExampleStruct struct {
+	Name  string
+	Value string
+}
+
+type ExampleStructSlice []ExampleStruct
+
+func (l ExampleStructSlice) Value() (driver.Value, error) {
+	return json.Marshal(l)
+}
+
+func (l *ExampleStructSlice) Scan(input interface{}) error {
+	return json.Unmarshal(input.([]byte), l)
+}