Skip to main content

update_attributes and associations - customizing rails magic

For sources in Rriki the user types in a list of authors for that publication and RRiki takes care of looking up the database of known authors, creating new entries if need be and then linking the relevant authors to the publication. This is all good and dandy for the user, but editing poses a problem: update_attributes takes its information from the form, which does not have the association information.

From api.rubyonrails.org we have :

def update_attributes(attributes)
self.attributes = attributes
save
end


All that was needed was to not use the bundled update_attributes and instead manually do

@source.attributes = params[:source]
@source.attach_authors_to_this_source
@source.save


Another instance where it is necessary to break into the comfy 'it just works' world of rails and customize some of the magic.

Comments

  1. I happen to face a similar problem, but I use auto complete fields on the forms and then link them in the update method.

    ReplyDelete
  2. @ Tarun: i have tried the similar approach what you have taken but in my case its not working ???

    ReplyDelete

Post a Comment

Popular posts from this blog

Python: Multiprocessing: passing multiple arguments to a function

Write a wrapper function to unpack the arguments before calling the real function. Lambda won't work, for some strange un-Pythonic reason.


import multiprocessing as mp def myfun(a,b): print a + b def mf_wrap(args): return myfun(*args) p = mp.Pool(4) fl = [(a,b) for a in range(3) for b in range(2)] #mf_wrap = lambda args: myfun(*args) -> this sucker, though more pythonic and compact, won't work p.map(mf_wrap, fl)

Flowing text in inkscape (Poster making)

You can flow text into arbitrary shapes in inkscape. (From a hint here).

You simply create a text box, type your text into it, create a frame with some drawing tool, select both the text box and the frame (click and shift) and then go to text->flow into frame.

UPDATE:

The omnipresent anonymous asked:
Trying to enter sentence so that text forms the number three...any ideas?
The solution:
Type '3' using the text toolConvert to path using object->pathSize as necessaryRemove fillUngroupType in actual text in new text boxSelect the text and the '3' pathFlow the text

Running a task in a separate thread in a Tkinter app.

Use Queues to communicate between main thread and sub-threadUse wm_protocol/protocol to handle quit eventUse Event to pass a message to sub-threadimport Tkinter as tki, threading, Queue, time def thread(q, stop_event): """q is a Queue object, stop_event is an Event. stop_event from http://stackoverflow.com/questions/6524459/stopping-a-thread-python """ while(not stop_event.is_set()): if q.empty(): q.put(time.strftime('%H:%M:%S')) class App(object): def __init__(self): self.root = tki.Tk() self.win = tki.Text(self.root, undo=True, width=10, height=1) self.win.pack(side='left') self.queue = Queue.Queue(maxsize=1) self.poll_thread_stop_event = threading.Event() self.poll_thread = threading.Thread(target=thread, name='Thread', args=(self.queue,self.poll_thread_stop_event)) self.poll_thread.start() self.poll_interval = 250 self.poll() self.root.wm_protocol("WM_DELETE…