123 lines
3.1 KiB
Python
123 lines
3.1 KiB
Python
from sqlobject import *
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from sqlobject.sqlbuilder import *
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from ceo import conf
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from ceo import members
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from ceo import terms
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import time
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from datetime import datetime, timedelta
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CONFIG_FILE = "/etc/csc/library.cf"
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cfg = {}
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def configure():
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"""
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Load configuration
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"""
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cfg_fields = [ "library_connect_string" ]
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temp_cfg = conf.read(CONFIG_FILE)
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conf.check_string_fields(CONFIG_FILE, cfg_fields, temp_cfg)
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cfg.update(temp_cfg)
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sqlhub.processConnection = connectionForURI(cfg["library_connect_string"])
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class Book(SQLObject):
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"""
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A book. This does all the stuff we could
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ever want to do with a book.
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"""
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isbn = StringCol()
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title = StringCol()
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year = StringCol()
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publisher = StringCol()
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authors = SQLRelatedJoin("Author")
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signouts = SQLMultipleJoin("Signout")
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def sign_out(self, u):
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"""
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Call this with a username to sign out
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a book.
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"""
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if members.registered(u, terms.current()):
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s = Signout(username=u, book=self,
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outdate=datetime.today(), indate=None)
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def sign_in(self, u):
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"""
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Call this to check a book back in to
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the library. Username is used to
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disambiguate in case more than one
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copy of this book has been signed out.
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"""
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s = self.signouts.filter(AND(Signout.q.indate==None, Signout.q.username==u))
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if s.count() > 0:
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list(s.orderBy(Signout.q.outdate).limit(1))[0].sign_in()
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return True
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else:
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raise Exception("PEBKAC: Book not signed out!")
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def __str__(self):
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"""
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Magic drugs to make books display
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nicely.
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"""
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book = "%s [%s]" % (self.title, self.year)
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book += "\nBy: "
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for a in self.authors:
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book += a.name
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book += ", "
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if self.authors.count() < 1:
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book += "(unknown)"
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book = book.strip(", ")
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signouts = self.signouts.filter(Signout.q.indate==None)
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if signouts.count() > 0:
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book += "\nSigned Out: "
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for s in signouts:
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book += s.username + " (" + str(s.due_date) + "), "
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book = book.strip(", ")
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return book
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class Author(SQLObject):
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"""
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An author can author many books, and a book
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can have many authors. This lets us map
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both ways.
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"""
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name = StringCol()
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books = RelatedJoin("Book")
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class Signout(SQLObject):
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"""
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An instance of a signout associates usernames,
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books, signout dates, and return dates to mark
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that a book has been signed out by a particular
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user.
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"""
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username = StringCol()
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book = ForeignKey("Book")
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outdate = DateCol()
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indate = DateCol()
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def sign_in(self):
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"""
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Terminate the signout (return the book).
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"""
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self.indate = datetime.today()
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def _get_due_date(self):
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"""
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Compute the due date of the book based on the sign-out
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date.
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"""
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return self.outdate + timedelta(weeks=2)
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if __name__ == "__main__":
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print "This functionality isn't implemented yet."
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