chore(inserter): initializing on an empty array by default (#63)

* initializing the fields on default

* initializing the fields on default

* using default behaviour

inserter/batch.go

@@ -49,8 +49,8 @@ type SQLBatch struct {
 // newBatchDefaults returns a new SQLBatch with default values
 func newBatchDefaults(opts ...BatchOpt) *SQLBatch {
 	b := &SQLBatch{
-		fields:  nil,
-		args:    nil,
+		fields:  make([]string, 0),
+		args:    make([]any, 0),
 		db:      nil,
 		tagName: patcher.DefaultDbTagName,
 		table:   "",
@@ -64,10 +64,18 @@ func newBatchDefaults(opts ...BatchOpt) *SQLBatch {
 }
 
 func (b *SQLBatch) Fields() []string {
+	if len(b.fields) == 0 {
+		// Default behaviour to return nil if no fields are set
+		return nil
+	}
 	return b.fields
 }
 
 func (b *SQLBatch) Args() []any {
+	if len(b.args) == 0 {
+		// Default behaviour to return nil if no args are set
+		return nil
+	}
 	return b.args
 }
 

patch.go

@@ -74,8 +74,8 @@ type SQLPatch struct {
 func newPatchDefaults(opts ...PatchOpt) *SQLPatch {
 	// Default options
 	p := &SQLPatch{
-		fields:            nil,
-		args:              nil,
+		fields:            make([]string, 0),
+		args:              make([]any, 0),
 		db:                nil,
 		tagName:           DefaultDbTagName,
 		table:             "",
@@ -97,10 +97,18 @@ func newPatchDefaults(opts ...PatchOpt) *SQLPatch {
 }
 
 func (s *SQLPatch) Fields() []string {
+	if len(s.fields) == 0 {
+		// Default behaviour is to return nil if there are no fields
+		return nil
+	}
 	return s.fields
 }
 
 func (s *SQLPatch) Args() []any {
+	if len(s.args) == 0 {
+		// Default behaviour is to return nil if there are no args
+		return nil
+	}
 	return s.args
 }
 

patch_opts.go

@@ -37,7 +37,7 @@ func WithWhere(where Wherer) PatchOpt {
 		}
 		fwSQL, fwArgs := where.Where()
 		if fwArgs == nil {
-			fwArgs = []any{}
+			fwArgs = make([]any, 0)
 		}
 		wtStr := WhereTypeAnd // default to AND
 		wt, ok := where.(WhereTyper)
@@ -59,7 +59,7 @@ func WithJoin(join Joiner) PatchOpt {
 		}
 		fjSQL, fjArgs := join.Join()
 		if fjArgs == nil {
-			fjArgs = []any{}
+			fjArgs = make([]any, 0)
 		}
 		s.joinSql.WriteString(strings.TrimSpace(fjSQL))
 		s.joinSql.WriteString("\n")