Join 视图钩子视图查询改变连接

在hook\u视图\u查询\u alter中，我构建连接查询，如下所示：

$join = new views_join();
$join->table = 'table_2';
$join->field = 'field_2';
$join->left_table = 'table_1';
$join->left_field = 'field_1';
$join->type = 'LEFT';
$join->extra = array(
  array(
     'table' => 'table_2',
     'field' => 'field_3',
     'value' => 'table_1.field_4',
  ),
);

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = table_2.field_4

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = 'table_2.field_4'

查询应如下所示：

$join = new views_join();
$join->table = 'table_2';
$join->field = 'field_2';
$join->left_table = 'table_1';
$join->left_field = 'field_1';
$join->type = 'LEFT';
$join->extra = array(
  array(
     'table' => 'table_2',
     'field' => 'field_3',
     'value' => 'table_1.field_4',
  ),
);

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = table_2.field_4

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = 'table_2.field_4'

我的问题是这里的“值”=>“表1.字段4”。我无法将值设置为字段。它将其视为字符串值。所以在我的查询中，我有不需要的单引号

最后，我的查询如下所示：

$join = new views_join();
$join->table = 'table_2';
$join->field = 'field_2';
$join->left_table = 'table_1';
$join->left_field = 'field_1';
$join->type = 'LEFT';
$join->extra = array(
  array(
     'table' => 'table_2',
     'field' => 'field_3',
     'value' => 'table_1.field_4',
  ),
);

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = table_2.field_4

LEFT JOIN {table_2} table_2 ON table_1.field_1 = table_2.field_2 AND table_1.field_3 = 'table_2.field_4'

---

我不确定这是否是最好的解决方案，但是：

$join = new views_join();
$join->table = 'table_2';
$join->field = 'field_2';
$join->left_table = 'table_1';
$join->left_field = 'field_1';
$join->type = 'LEFT';

$join->extra = 'table_1.field_3 = table_2.field_4';

对我有用