Filtering on index.RelatedFields

[kaedroho]

For Example, say we have the following models:

class Author(models.Model):
    name = models.CharField()
    birth_date = models.DateField()
    ...


class Book(index.Indexed, models.Model):
    title = models.CharField()
    author = models.ForeignKey(Author)
    ...

    search_fields = [
        index.SearchField("title"),
        index.RelatedFields("author", [
            index.FilterField("birth_date")
        ]),
    ]

The following query won't work, because author__birth_date can't be used:

Book.objects.filter(author__birth_date__lt=date(1, 1, 1950)).search("A search query")

This is currently unimplemented because of the way Django stores related filter lookups on QuerySets is quite difficult to reverse.