Laravel動態數據透視表

Question

在我的應用程序中，我在測試過程中使用自定義類復制表。 此類使用_test后綴創建新表，並告訴雄辯者使用它們。 但是，當我使用“多對多”關系時，我也需要指定數據透視表名稱。 在運行時應用程序期間可以更改數據透視表嗎？

Answer 1

如果我正確理解了您的問題，那么您希望能夠動態更改多對多關系中的表。

請注意belongsToMany關系的源代碼：

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
    );
}

您可以在此處定義表格。 因此，我建議您執行以下操作：（考慮User和Company模型之間的多對多關系）

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

並針對公司模型執行相同的操作，我從未對此進行過測試，但基本上應該可以工作。