fix: Added addPolicies and removePolicies function.

adapter.go

@@ -220,7 +220,7 @@ func (a *Adapter) SavePolicy(model model.Model) error {
 			OnConflict("DO NOTHING").
 			Insert()
 		return err
-	}
+	}	
 	return nil
 }
 
@@ -233,6 +233,22 @@ func (a *Adapter) AddPolicy(sec string, ptype string, rule []string) error {
 	return err
 }
 
+// AddPolicies adds policy rules to the storage.
+func (a *Adapter) AddPolicies(sec string, ptype string, rules [][]string) error {
+	var lines []*CasbinRule
+	for _,rule := range rules{
+		line := savePolicyLine(ptype, rule)
+		lines = append(lines, line)
+	}
+	
+	err := a.db.RunInTransaction(func(tx *pg.Tx) error {
+		_, err := tx.Model(&lines).OnConflict("DO NOTHING").Insert()
+        return err
+	})
+	
+	return err
+}
+
 // RemovePolicy removes a policy rule from the storage.
 func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error {
 	line := savePolicyLine(ptype, rule)
@@ -240,6 +256,22 @@ func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error {
 	return err
 }
 
+// RemovePolicies removes policy rules from the storage.
+func (a *Adapter) RemovePolicies(sec string, ptype string, rules [][]string) error {
+	var lines []*CasbinRule
+	for _,rule := range rules{
+		line := savePolicyLine(ptype, rule)
+		lines = append(lines, line)
+	}
+
+	err := a.db.RunInTransaction(func(tx *pg.Tx) error {
+		_, err := tx.Model(&lines).Delete()
+        return err
+	})
+	
+	return err
+}
+
 // RemoveFilteredPolicy removes policy rules that match the filter from the storage.
 func (a *Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error {
 	query := a.db.Model((*CasbinRule)(nil)).Where("p_type = ?", ptype)