active-record-query - 我可以在 ActiveRecord 中有一个独立的子句吗？

Question

我想在我的两个查询中排除 where 子句，如下所示：

where_clause = where("(created_at >= ? and created_at < ?) or (updated_at >= ? and updated_at < ?)", range_start_date, range_end_date, range_start_date, range_end_date)
@book_instances = BookInstance.limit(pagination.items_per_page).
    offset((pagination.page - 1) * pagination.items_per_page).
    where_clause.
    order(:id)
@pagination.total_items = BookInstance.where_clause.count

但 ActiveRecord 并不高兴。我认为您可以独立分解查询位。

Answer 1

我最终这样做了，但我仍然想知道我是否错过了另一种更好的方法：

book_instances_in_date_range = BookInstance.where(
    "(created_at >= ? and created_at < ?) or (updated_at >= ? and updated_at < ?)",
    range_start_date, range_end_date, range_start_date, range_end_date)

@pagination.total_items = book_instances_in_date_range.count

@book_instances = book_instances_in_date_range.limit(pagination.items_per_page).
    offset((pagination.page - 1) * pagination.items_per_page).
    order(:id)