Move OL editions to correct Work

move_editions.py

from olclient.openlibrary import OpenLibrary
ol = OpenLibrary()


def move_editions(editions, master):
    """Sets a list of <editions> to a new master work ID using the Open Library Client.
       Copies across extra author data from editions to master, if not already present.
       Example:
           move_editions(['OL8306567M','OL16682544M'], 'OL4005510W')
    """
    output = []
    authors = []
    for e in editions:
        ed = ol.get(e)
        for a in ed.authors:
            if a.type['key'] == '/type/delete':
                ed.authors.remove(a)
        ed.work_olid = master
        #ed.validate()
        authors += [a.olid for a in ed.authors if a.olid not in authors]
        output.append(ed)
    w = ol.get(master)
    existing_authors = [a['author']['key'].replace('/authors/', '') for a in (w.authors if hasattr(w, 'authors') else [])]
    authors = [a for a in authors if a not in existing_authors]
    for a in authors:
        if not hasattr(w, 'authors'):
            w.authors = []
        w.add_author(ol.get(a))
    if authors: # only save if we have made changes
        output.append(w)
    return ol.save_many(output, "associate %i editions with work %s" % (len(editions), master))