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  • Django: remove all m2m relations

    - by pistacchio
    Hi, if I have two simple models: class Tag(models.Model): name = models.CharField(max_length=100) class Post(models.Model): title = models.CharField(max_length=100) tags = models.ManyToManyField(Tag, blank=True) given a Post object with a number of Tags added to it, I know hot to remove any of them, but how to do a mass remove (remove all)? Thanks

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  • problem with QMainWindow setCentralWidget and stackedWidget

    - by user63898
    Hello i have gui the i created in the designer , simple one . QMainWIndow that contains stackedWidget , the application starts with stackedWidget index 0 that contains qwebkit widget and after some user flow ,it changes to stackedWidget index 1 that contains QTree widget , to center the first widget i use in the QMainWindow constractor this line of code this-setCentralWidget(ui.webView); but when the application switching to index number 1 im getting exception that is coming from the switching command . why ?

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  • DB Interface Design Optimization: Is it better to optimise for Fewer requests of smaller data size?

    - by Overflow
    The prevailing wisdom in webservices/web requests in general is to design your api such that you use as few requests as possible, and that each request returns therefore as much data as is needed In database design, the accepted wisdom is to design your queries to minimise size over the network, as opposed to minimizing the number of queries. They are both remote calls, so what gives?

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  • JSplitPane SetDividerLocation Problem

    - by Goutham
    I have a JSplitPane which when shown should split the pane by 50%. Now on giving an argument of 0.5 (as suggested) to setDividerLocation, Java seems to treat it as a normal number instead of a percentage. As in, the divider, instead of going to the middle of the pane, is almost at the start of the left pane (the pane is vertically split). Any work arounds?

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  • What's the difference between single and double quotes in Objective-C?

    - by Alex Mcp
    I'm working through a book exercise to generate some random serial number, and here's my function: NSString *randomSerialNumber = [NSString stringWithFormat:@"%c%c%c%c%c", '0' + random() % 10, 'A' + random() % 26, '0' + random() % 10, 'A' + random() % 26, '0' + random() % 10]; This works and has an output like: 2J6X7. But before, the 0s and As I had wrapped in double quotes, and an example output was 11764iÒ˜. What did I do wrong my first time around, and why did using single quotes fix it?

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  • Declare Locally or Globally in Delphi?

    - by lkessler
    I have a procedure my program calls tens of thousands of times that uses a generic structure like this: procedure PrintIndiEntry(JumpID: string); type TPeopleIncluded = record IndiPtr: pointer; Relationship: string; end; var PeopleIncluded: TList<TPeopleIncluded>; PI: TPeopleIncluded; begin { PrintIndiEntry } PeopleIncluded := TList<TPeopleIncluded>.Create; { A loop here that determines a small number (up to 100) people to process } while ... do begin PI.IndiPtr := ...; PI.Relationship := ...; PeopleIncluded.Add(PI); end; DoSomeProcess(PeopleIncluded); PeopleIncluded.Clear; PeopleIncluded.Free; end { PrintIndiEntry } Alternatively, I can declare PeopleIncluded globally rather than locally as follows: unit process; interface type TPeopleIncluded = record IndiPtr: pointer; Relationship: string; end; var PeopleIncluded: TList<TPeopleIncluded>; PI: TPeopleIncluded; procedure PrintIndiEntry(JumpID: string); begin { PrintIndiEntry } { A loop here that determines a small number (up to 100) people to process } while ... do begin PI.IndiPtr := ...; PI.Relationship := ...; PeopleIncluded.Add(PI); end; DoSomeProcess(PeopleIncluded); PeopleIncluded.Clear; end { PrintIndiEntry } procedure InitializeProcessing; begin PeopleIncluded := TList<TPeopleIncluded>.Create; end; procedure FinalizeProcessing; begin PeopleIncluded.Free; end; My question is whether in this situation it is better to declare PeopleIncluded globally rather than locally. I know the theory is to define locally whenever possible, but I would like to know if there are any issues to worry about with regards to doing tens of thousands of of "create"s and "free"s? Making them global will do only one create and one free. What is the recommended method to use in this case? If the recommended method is to still define it locally, then I'm wondering if there are any situations where it is better to define globally when defining locally is still an option.

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  • Trigger function on deserialization

    - by Tom Savage
    I have a class with a number of fields which are normally calculated in the constructor from other data in the class. They are not serialized to XML because any changes to the rest of the data will likely require their recalculation. Is there a way I can set up a function call to be triggered on deserialization?

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  • IE Script Error/JQuery Cycle

    - by ReidHawkins
    I am working on a site and it works/looks great in Safari, Firefox, Chrome and IE8. For some reason when testing it in IE 6 and 7 the jQuery does not work (the images are there but static) I get the following error message: Internet Explorer Script Error. Line: 38 Char: 1 Error: Expected Identifier, string or number Code: 0 Can someone help me out with this? Internet Exploder is killing me....

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  • bash "map" equivalent: run command on each file

    - by Claudiu
    I often have a command that processes one file, and I want to run it on every file in a directory. Is there any built-in way to do this? For example, say I have a program data which outputs an important number about a file: ./data foo 137 ./data bar 42 I want to run it on every file in the directory in some manner like this: map data `ls *` ls * | map data to yield output like this: foo: 137 bar: 42

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  • Some menu customisation in Silverstripe

    - by alienv
    1) i need set different class name for every menu item, based on a menu row (iterating, i need just a number) <% control Menu(1) %> <div class="mainmenu-item-$MenuItemRow"><a href="$Link">$MenuTitle</a></div> <% end_control %> 2) is there a simple way to create an small second menu ?

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  • Returning modified data to a template

    - by Duncan
    I need to amend QuerySet data when i return it to a template. for example, model.objects.all() returns a date (with other fields), but i also want to return the number of days since that date has passed. This is so that in the template, i can say "you last logged in 4 days ago". What is the best way to do this?

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  • Updating an atom with a single value

    - by mikera
    I have a number of atoms in my code where a common requirement is to update them to a new value, regardless of the current value. I therefore find myself writing something like this: (swap! atom-name (fn [_] (identity new-value))) This works but seems pretty ugly and presumably incurs a performance penalty for constructing the anonymous closure. Is there a better way?

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  • Python: concatenate generator and item

    - by TarGz
    I have a generator (numbers) and a value (number). I would like to iterate over these as if they were one sequence: i for i in tuple(my_generator) + (my_value,) The problem is, as far as I undestand, this creates 3 tuples only to immediately discard them and also copies items in "my_generator" once. Better approch would be: def con(seq, item): for i in seq: yield seq yield item i for i in con(my_generator, my_value) But I was wondering whether it is possible to do it without that function definition

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  • sort array of size n

    - by Grv
    if an array of size n has only 3 values 0 ,1 and 2 (repeated any number of times) what is the best way to sort them. best indicates complexity. consider space and time complexity both

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  • ms access negative page numbers

    - by FrustratedWithFormsDesigner
    I have an access report that generates 36505 pages (un filtered, and about half of each page is taken up by group headers and page headers) , though the footer at the bottom of the report page says "36505 of -29031". This looks like an overflow problem maybe, though I'm confused how it got the current page number of the last page OK, but failed to get total page count. Has anyone dealt with this before?

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  • how to print the linenumber of incorrectwords located in a txt file ?

    - by jad
    i have this piece of code which only prints the line number of the incorrect words. i want it to print the linenumbers of the incorrect words from the txt file. Am i able to modify this code to do that? # text1 is my incorrect words # words is my text file where my incorrect word are in from collections import defaultdict d = defaultdict(list) for lineno, word in enumerate(text1): d[word].append(lineno) print(d)

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  • How are updates to the .net framework handled in azure?

    - by Allen
    If someone is hosting something in Azure and a new KB comes along and requires the .net framework to be updated, how is this handled in Azure? Do they automatically update it for you or give you the option to remain at the older version? I'm more interested in how the versioning is handled, rather than uptime etc. Do they force you to stay at the most up to date version of a given version number? As in, the most up to date version of 3.5, etc.

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