Allow indexing fields from related models

[zgoda]

I have 2 models related by foreign key and I would like to search data from related model, eg Author and Book so I could search for both author name and book title. I can create artificial field that concatenates all fields I want to have searchable but this is inconvenient.

This could be like eg:

class Book(db.Model):
    __searchable__ = ['title', 'summary', 'author.full_name']

where author is db.relationship based on foreign key

[honmaple]

Thank you for your support,at present flask-msearch doesn't support relationship column,I will add it in the future.

[zgoda]

Okay, I'm working on a PR that would allow some workaround using SQLAlchemy hybrid_property. Basically one change to _schema() method to detect that this is not a "normal" field.

[honmaple]

Related models has been added on fe4544f