Add UUIDArray struct for handling them correctly with databases (#10)

Drop support for Go 1.15 and add support for Go 1.20
Update golangci-lint to 1.51.2
Change master for main

.github/workflows/ci.yml

@@ -2,15 +2,15 @@ name: CI
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    branches: [ master ]
+    branches: [ main ]
 
 jobs:
   build:
     strategy:
       matrix:
-        go-version: [ 1.15, 1.16, 1.17, 1.18, 1.19 ]
+        go-version: [ 1.16, 1.17, 1.18, 1.19, '1.20' ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
 
     runs-on: ${{ matrix.os }}
@@ -25,7 +25,7 @@ jobs:
       - name: Enforce standard format
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.50.1
+          version: v1.51.2
           args: --timeout 3m --enable=gofmt --verbose
       - name: Test
         run: go test --cover -v ./...

uuid_array.go

@@ -0,0 +1,27 @@
+package uuid
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+)
+
+type UUIDArray []UUID
+
+func (a *UUIDArray) Scan(val interface{}) error {
+	switch v := val.(type) {
+	case nil:
+		*a = []UUID{}
+		return nil
+	case []byte:
+		return json.Unmarshal(v, &a)
+	case string:
+		return json.Unmarshal([]byte(v), &a)
+	default:
+		return fmt.Errorf("Unsupported type: %T", v)
+	}
+}
+
+func (a UUIDArray) Value() (driver.Value, error) {
+	return json.Marshal(a)
+}

uuid_array_test.go

@@ -0,0 +1,51 @@
+package uuid
+
+import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func Test_StringArray_Scan(t *testing.T) {
+	var (
+		uuid1, _  = FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
+		uuid2, _  = FromString("3964fdbc-dc5a-4ec6-8a6b-eecfa5a8e9ae")
+		uuidArray = UUIDArray{uuid1, uuid2}
+	)
+
+	json := `["6ba7b810-9dad-11d1-80b4-00c04fd430c8","3964fdbc-dc5a-4ec6-8a6b-eecfa5a8e9ae"]`
+	newArrays := UUIDArray{}
+	err := newArrays.Scan(json)
+	assert.Equal(t, uuidArray, newArrays)
+	assert.NoError(t, err)
+
+	newArrays = UUIDArray{}
+	err = newArrays.Scan([]byte(json))
+	assert.Equal(t, uuidArray, newArrays)
+	assert.NoError(t, err)
+
+	err = newArrays.Scan(nil)
+	assert.Equal(t, newArrays, UUIDArray{})
+	assert.NoError(t, err)
+
+	err = newArrays.Scan(42)
+	assert.Error(t, err)
+
+	err = newArrays.Scan("{I am not a valid json")
+	assert.Error(t, err)
+
+	err = newArrays.Scan(nil)
+	assert.NoError(t, err)
+}
+
+func Test_StringArray_Value(t *testing.T) {
+	var (
+		uuid1, _  = FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
+		uuid2, _  = FromString("3964fdbc-dc5a-4ec6-8a6b-eecfa5a8e9ae")
+		uuidArray = UUIDArray{uuid1, uuid2}
+	)
+
+	expected := `["6ba7b810-9dad-11d1-80b4-00c04fd430c8","3964fdbc-dc5a-4ec6-8a6b-eecfa5a8e9ae"]`
+	val, _ := uuidArray.Value()
+	assert.Equal(t, expected, fmt.Sprintf("%s", val))
+}