fix: incorrect store Delete() method implementation

stores/memory/store.go

@@ -149,15 +149,18 @@ func (s *Store) SetMulti(id string, data map[string]interface{}) error {
 }
 
 // Delete deletes a key from session.
-func (s *Store) Delete(id string, key string) error {
+func (s *Store) Delete(id string, keys ...string) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
 	_, ok := s.sessions[id]
 	if !ok {
 		return ErrInvalidSession
 	}
-	delete(s.sessions[id], key)
+
+	for _, k := range keys {
+		delete(s.sessions[id], k)
+	}
 
 	return nil
 }

stores/postgres/postgres.go

@@ -15,6 +15,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/lib/pq"
 	_ "github.com/lib/pq"
 )
 
@@ -203,8 +204,8 @@ func (s *Store) SetMulti(id string, data map[string]interface{}) (err error) {
 }
 
 // Delete deletes a key from redis session hashmap.
-func (s *Store) Delete(id string, key string) error {
-	res, err := s.q.delete.Exec(id, key)
+func (s *Store) Delete(id string, keys ...string) error {
+	res, err := s.q.delete.Exec(id, pq.Array(keys))
 	if err != nil {
 		return err
 	}
@@ -388,7 +389,7 @@ func (s *Store) prepareQueries() (*queries, error) {
 		return nil, err
 	}
 
-	q.delete, err = s.db.Prepare(fmt.Sprintf("UPDATE %s SET data = data - $2 WHERE id=$1", s.opt.Table))
+	q.delete, err = s.db.Prepare(fmt.Sprintf("UPDATE %s SET data = data #- $2 WHERE id=$1", s.opt.Table))
 	if err != nil {
 		return nil, err
 	}

stores/redis/store.go

@@ -184,8 +184,8 @@ func (s *Store) SetMulti(id string, data map[string]interface{}) error {
 }
 
 // Delete deletes a key from redis session hashmap.
-func (s *Store) Delete(id string, key string) error {
-	return s.client.HDel(s.clientCtx, s.prefix+id, key).Err()
+func (s *Store) Delete(id string, keys ...string) error {
+	return s.client.HDel(s.clientCtx, s.prefix+id, keys...).Err()
 }
 
 // Clear clears session in redis.

stores/securecookie/secure_cookie.go

@@ -202,15 +202,17 @@ func (s *Store) Flush(cv string) (string, error) {
 // Delete deletes a field from session. Once called, Flush() should be
 // called to retrieve the updated, unflushed values and written to the cookie
 // externally.
-func (s *Store) Delete(cv, key string) error {
+func (s *Store) Delete(cv string, keys ...string) error {
 	// Decode current cookie
 	vals, err := s.decode(cv)
 	if err != nil {
 		return ErrInvalidSession
 	}
 
-	// Delete given key in current values.
-	delete(vals, key)
+	for _, k := range keys {
+		// Delete given key in current values.
+		delete(vals, k)
+	}
 
 	// Create session map if doesn't exist.
 	s.mu.Lock()