Laravel动态数据透视表

Question

在我的应用程序中，我在测试过程中使用自定义类复制表。 此类使用_test后缀创建新表，并告诉雄辩者使用它们。 但是，当我使用“多对多”关系时，我也需要指定数据透视表名称。 在运行时应用程序期间可以更改数据透视表吗？

Answer 1

如果我正确理解了您的问题，那么您希望能够动态更改多对多关系中的表。

请注意belongsToMany关系的源代码：

public function belongsToMany($related, $table = null, $foreignKey = null, $relatedKey = null, $relation = null)
{
    // If no relationship name was passed, we will pull backtraces to get the
    // name of the calling function. We will use that function name as the
    // title of this relation since that is a great convention to apply.
    if (is_null($relation)) {
        $relation = $this->guessBelongsToManyRelation();
    }

    // First, we'll need to determine the foreign key and "other key" for the
    // relationship. Once we have determined the keys we'll make the query
    // instances as well as the relationship instances we need for this.
    $instance = $this->newRelatedInstance($related);

    $foreignKey = $foreignKey ?: $this->getForeignKey();

    $relatedKey = $relatedKey ?: $instance->getForeignKey();

    // If no table name was provided, we can guess it by concatenating the two
    // models using underscores in alphabetical order. The two model names
    // are transformed to snake case from their default CamelCase also.
    if (is_null($table)) {
        $table = $this->joiningTable($related);
    }

    return new BelongsToMany(
        $instance->newQuery(), $this, $table, $foreignKey, $relatedKey, $relation
    );
}

您可以在此处定义表格。 因此，我建议您执行以下操作：（考虑User和Company模型之间的多对多关系）

public function users(){
     $table = env('APP_ENV') == 'production' ? 'table_name' : 'test_table_name';
     $this->belongsToMany(User::class, $table);
}

并针对公司模型执行相同的操作，我从未对此进行过测试，但基本上应该可以工作。