我不确定它是否理想，但DB方案已经很奇怪了。
我在Summary模型中创建了一个“getMerchant（）”

public function getMerchant()
{
    $merchant = Merchant::find()->where(['merchant_id' => $this->merchant_id])->one();
    
    return $merchant;
}

...并根据过滤器从商户集合中获取所有商户ID

public function getMerchantIDs($where = []) 
{
    $merchant_ids = Merchant::find()->
        select('merchant_id')->
        where($where)->
        column();
    
    return $merchant_ids;
}

对于搜索模型，

public $merchant_type;
public $merchant_branch_code;

public function search($params) {
    .......
    .......
    $condition = [];
    if (isset($this->merchant_type)) {
        $condition['merchant_type'] = $this->merchant_type;
    }

    if (isset($this->merchant_branch_code)) {
        $condition['branch_code'] = $this->merchant_branch_code;
    }

    $merchant_ids = $this->getMerchantIDs($condition);
    $query->andFilterWhere(['in', 'merchant_id', $merchant_ids]);

在GridView上，类似于以下内容：

[
    'attribute' => 'merchant_branch_code',
    'label' => 'Branch Code',
    'value' => function($model){
        return $model->merchant->branch_code;
    },
],