def post(self, icon_key=None):
action = self.request.get('action')
if action == 'add_channel':
#parent group for all channels is default-group
k = ndb.Key(db_defs.Channel, self.app.config.get('default-group'))
chan = db_defs.Channel(parent=k)
chan.name = self.request.get('channel-name')
#construct a key from a url safe string for every checkbox that was checked in the form
#classes[] just denotes the group of classes that was checked
#turn all of those checked classes into a list of keys (list comprehensions basically append to lists quickly)
#recall from deb_defs.py that the Channel's classes property = ndb.KeyProperty(repeated=True) is repeated,
#so it takes a list of keys
chan.classes = [ndb.Key(urlsafe=x) for x in self.request.get_all('classes[]')]
chan.active = True
chan.icon = icon_key
chan.put() #save the channel
self.template_values['message'] = 'Added channel '+chan.name+' to the database.'
elif action=='add_class':
k=ndb.Key(db_defs.ChannelClass, self.app.config.get('default-group'))
c=db_defs.ChannelClass(parent=k)
c.name=self.request.get('class-name')
c.put()
#overwrites the message value in the template_values dictionary
self.template_values['message'] = 'Added class '+c.name+' to the database.'
else:
self.template_values['message'] = 'Action '+action+' is unknown.'
console.log([{'name':x.name,'key':x.key.urlsafe()} for x in db_defs.ChannelClass.query(ancestor=ndb.Key(db_defs.Channel, self.app.config.get('default-group'))).fetch()])
self.render('admin.html')
def render(self,page): #override render
#python list comprehension
self.template_values['classes']=[{'name':x.name,'key':x.key.urlsafe()} for x in db_defs.ChannelClass.query(ancestor=ndb.Key(db_defs.ChannelClass, self.app.config.get('default-group'))).fetch()]
console.log(self.template_values['classes'])
#db_defs.Channel.query().fetch() gets a list of all channels stored in db
#for each x in channels, we want to create a dict with name associated with the channel and a key
#associated with a url safe string of the key (turns the key, a string that includes info about the class and its
#identifier and turns it into something we can pass to a website without being mangled by html encoding
#the outer [ ] makes the entire thing into a list
#thus, we get a list of dictionaries {'name':x.name,'key':x.key.urlsafe()} of all channels
#[{'name':x.name,'key':x.key.urlsafe()},{'name':x.name,'key':x.key.urlsafe()},{'name':x.name,'key':x.key.urlsafe()} etc]
#which is assigned to channels
self.template_values['channels']=[{'name':x.name,'key':x.key.urlsafe()} for x in db_defs.Channel.query(ancestor=ndb.Key(db_defs.Channel, self.app.config.get('default-group'))).fetch()]
#db_defs.Channel.query().fetch() gets a list of all channels stored in db
base_page.BaseHandler.render(self, page, self.template_values)