Like Tim said, rather let the database do your work for you:
from sqlalchemy.sql import and_
def checkAuthor(self, new_author, edit=False):
"""
Returns True when the given Author is already in the list elsewise False.
"""
authors = self.songmanager.get_objects_filtered(Author,
and_(
Author.first_name == new_author.first_name,
Author.last_name == new_author.last_name,
Author.display_name == new_author.display_name
)
)
return edit or (len(authors) > 0)
--
https://code.launchpad.net/~googol-hush/openlp/trivial/+merge/29642
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