fix: operator.update, columns in where cant be updated

lib/operator.js

@@ -154,15 +154,16 @@ proto.update = function* (table, row, options) {
     options.where = {
       id: row.id,
     };
+    const indexOfId = options.columns.indexOf('id');
+    if (indexOfId !== -1) {
+      [].splice.call(options.columns, indexOfId, 1);
+    }
   }
 
   const sets = [];
   const values = [];
   for (let i = 0; i < options.columns.length; i++) {
     const column = options.columns[i];
-    if (column in options.where) {
-      continue;
-    }
     sets.push('?? = ?');
     values.push(column);
     values.push(row[column]);

test/client.test.js

@@ -721,6 +721,43 @@ describe('client.test.js', function() {
       const row = yield this.db.get(table, { id: user.id });
       assert.equal(row.email, user.email);
     });
+
+    it('should update columns in options.where', function* () {
+      const user = yield this.db.get(table, {
+        name: prefix + 'fengmk2-update',
+      });
+      const result = yield this.db.update(table, {
+        name: prefix + 'fengmk2-update-1',
+        email: prefix + '[email protected]',
+        gmt_modified: this.db.literals.now,
+      }, {
+        where: {
+          id: user.id,
+          name: prefix + 'fengmk2-update',
+          email: user.email,
+        },
+      });
+      assert.equal(result.affectedRows, 1);
+
+      const row = yield this.db.get(table, {
+        id: user.id,
+      });
+
+      assert.equal(user.id, row.id);
+      assert.notEqual(row.name, user.name);
+      assert.notEqual(row.email, user.email);
+
+      const _query = this.db._query;
+      this.db._query = function* (sql) { return sql; };
+
+      const sql = yield this.db.update(table, {
+        id: user.id,
+        name: prefix + 'fengmk2-update-2',
+        email: prefix + '[email protected]',
+      });
+      assert.equal(sql.split('WHERE').shift().indexOf('`id` = ') === -1, true);
+      this.db._query = _query;
+    });
   });
 
   describe('delete(table, where)', function() {