support binding of []int type to array integer

int4_array.go

@@ -23,6 +23,25 @@ func (dst *Int4Array) Set(src interface{}) error {
 
 	switch value := src.(type) {
 
+	case []int:
+		if value == nil {
+			*dst = Int4Array{Status: Null}
+		} else if len(value) == 0 {
+			*dst = Int4Array{Status: Present}
+		} else {
+			elements := make([]Int4, len(value))
+			for i := range value {
+				if err := elements[i].Set(value[i]); err != nil {
+					return err
+				}
+			}
+			*dst = Int4Array{
+				Elements:   elements,
+				Dimensions: []ArrayDimension{{Length: int32(len(elements)), LowerBound: 1}},
+				Status:     Present,
+			}
+		}
+
 	case []int32:
 		if value == nil {
 			*dst = Int4Array{Status: Null}

int4_array_test.go

@@ -1,6 +1,7 @@
 package pgtype_test
 
 import (
+	"math"
 	"reflect"
 	"testing"
 
@@ -54,8 +55,9 @@ func TestInt4ArrayTranscode(t *testing.T) {
 
 func TestInt4ArraySet(t *testing.T) {
 	successfulTests := []struct {
-		source interface{}
-		result pgtype.Int4Array
+		source        interface{}
+		result        pgtype.Int4Array
+		expectedError bool
 	}{
 		{
 			source: []int32{1},
@@ -64,6 +66,17 @@ func TestInt4ArraySet(t *testing.T) {
 				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
 				Status:     pgtype.Present},
 		},
+		{
+			source: []int{1},
+			result: pgtype.Int4Array{
+				Elements:   []pgtype.Int4{{Int: 1, Status: pgtype.Present}},
+				Dimensions: []pgtype.ArrayDimension{{LowerBound: 1, Length: 1}},
+				Status:     pgtype.Present},
+		},
+		{
+			source:        []int{1, math.MaxInt32 + 1, 2},
+			expectedError: true,
+		},
 		{
 			source: []uint32{1},
 			result: pgtype.Int4Array{
@@ -81,9 +94,17 @@ func TestInt4ArraySet(t *testing.T) {
 		var r pgtype.Int4Array
 		err := r.Set(tt.source)
 		if err != nil {
+			if tt.expectedError {
+				continue
+			}
 			t.Errorf("%d: %v", i, err)
 		}
 
+		if tt.expectedError {
+			t.Errorf("%d: an error was expected, %v", i, tt)
+			continue
+		}
+
 		if !reflect.DeepEqual(r, tt.result) {
 			t.Errorf("%d: expected %v to convert to %v, but it was %v", i, tt.source, tt.result, r)
 		}