Relax MatTableDataSource’s filter to be of type “{}”

Feature Description

Relax MatTableDataSource.filter to accept {}. Right now, it is restricted to string.
This would allow much easier custom filtering on multiple dimensions.

Use Case

When the filter is “only” a string, it makes it very difficult to “structurally” filter a table on multiple dimensions, even when customizing filterPredicate . Some recommendations on internet include:

• passing a JSon object, and parsing the JSon filterPredicate, for each and every row: http://nataliesmith.ca/blog/angular-material-filter-table
• everything in this bug thread: https://github.com/angular/components/issues/6178

While it works, it’s also a gratuitous workaround: It turns out that at no point does MatTableDataSource actually require filter to be a string: Whatever gets passed to filter just gets piped “as-is” to filterPredicate.

Here is a simple fork of “Table with filtering” that filters on different columns individually, where all I did was pass my complex object, while not respecting :
https://stackblitz.com/edit/table-filtering-multiple-filters-example?file=app/table-filtering-example.html
https://table-filtering-multiple-filters-example.stackblitz.io/

Caveats

It would still be up to the caller to make sure that their filter object is homogeneous with their filterPredicate object.

从 MatTableDataSource.filter 入口点开始，检查其值是如何传递给 filterPredicate 的。更新公共类型以接受 {}，同时保留现有的 predicate 流程，然后验证结构化的多维过滤器对象无需进行 JSON 转换即可工作。