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  • Can Core Data be used for objects with variable schemas?

    - by glenc
    I'm implementing a new iPhone app and am relatively new to Cocoa development overall. I am at the stage of choosing how the persistence layer of this app will work, and it looks like I'm basically choosing between Core Data and sqlite3. The persisted models in this app are intended to have a schema that is loaded at runtime (from some kind of defn file, probably XML). By which I mean, this app is intended to have objects that are user-definable to some extent, e.g. the Customer type (which has certain built-in fields like "name" and "email") can be modified to have extra fields based on the user's specific needs (e.g. a user might want to add a "favourite fruit" field to their Customer type). Having said that, will Core Data work for an app with a non-baked-in data model like this? I've just started playing around with the Core Data object designer thing in XCode and it seems like this thing wants to work with objects that have fixed fields that are compiled in. I'm definitely trying to take the path of least resistance here, and I can see the benefits of using an Apple-supplied data framework, but don't want to start down that path if it's going to lock me into a data model that's defined at compile time.

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  • question regarding the warning that comes everywhere

    - by user177893
    Hi, Would you be able to help to delete the warning discussed below ? I have one file example.h In that I declared static const NSString *variable = @"cool"; Now, I have another file multiple.m. In this file I have a function Bool var2 = [object methodname:variable]; It means, I passed variable as parameter for this function, but I got warning like this: variable is defined but not used So,how to remove this warning? please help me

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  • storing passed arguments in separate variables -shell scripting

    - by Nathan Pk
    In my script "script.sh" , I want to store 1st and 2nd argument to some variable and rest to another separate variable. What command I must use to implement this task? Number of arguments that is passed to a script is random) When I run the command in console ./script.sh abc def ghi jkl mn o p qrs xxx #It can have any number of arguments In this case, I want my script to store "abc" and "def" in one variable. "ghi jkl mn o p qrs xxx" should be stored in another variable.

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  • get values from table as key value pairs with jquery

    - by liz
    I have a table: <table class="datatable" id="hosprates"> <caption> hospitalization rates test</caption> <thead> <tr> <th scope="col">Funding Source</th> <th scope="col">Alameda County</th> <th scope="col">California</th> </tr> </thead> <tbody> <tr> <th scope="row">Medi-Cal</th> <td>34.3</td> <td>32.3</td> </tr> <tr> <th scope="row">Private</th> <td>32.2</td> <td>34.2</td> </tr> <tr> <th scope="row">Other</th> <td>22.7</td> <td>21.7</td> </tr> </tbody> </table> i want to retrieve column 1 and column 2 values per row as pairs that end up looking like this [funding,number],[funding,number] i did this so far, but when i alert it, it only shows [object, object]... var myfunding = $('#hosprates tbody tr').each(function(){ var funding = new Object(); funding.name = $('#hosprates tbody tr td:nth-child(1)').map(function() { return $(this).text().match(/\S+/)[0]; }).get(); funding.value= $('#hosprates tbody tr td:nth-child(2)').map(function() { return $(this).text().match(/\S+/)[0]; }).get(); }); alert (myfunding);

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  • It's possible to create variable to hold fields of class dynamically???

    - by yossharel
    hi all, In my 'Person' class, I have some fields like 'firstname','lastname','nickname' and so on. I want to write code to search dynamically, sometimes by 'firstname' and sometimes by 'nickname' field. The code I want to write, should be like this: Object someVariable = "firstname"; Person result = ListOfPerson.Where(p => p.someVariable = "exp").FirstOrDefault(); Can anyone Know if it's possible?

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  • How to set RAILS_ENV variable when running Rails tests?

    - by Jason
    In both my environment.rb and test_helper.rb files I have: ENV["RAILS_ENV"] = "development" I have one functional test written, however when I run it, the script tries to connect to my database using the "test" configuration settings which are in the database.ymal file & won't connect the the database. How can I run my tests using the "development" environment settings?

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  • How do I test if a variable is a number in bash?

    - by Flávio Amieiro
    I just can't figure out how do I make sure an argument passed to my script is a number or not. All I want to do is something like this: test *isnumber* $1 && VAR=$1 || echo "need a number" Any help? UPDATE: I managed (whit Charles' help) to do it, but I'm not yet sure it's the best way to do that (even though it worked on my tests). This is how it ended up: [[ $1 =~ "^[0-9]+$" ]] && echo "numero" && exit 0 || echo "nao numero" && exit 1

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  • Dynamic "OR" conditions in Rails 3

    - by Ryan Foster
    I am working on a carpool application where people can search for lifts. They should be able to select the city from which they would liked to be picked up and choose a radius which will then add the cities in range to the query. However the way it is so far is that i can only chain a bunch of "AND" conditions together where it would be right to say "WHERE start_city = city_from OR start_city = a_city_in_range OR start_city = another_city_in_range" Does anyone know how to achive this? Thanks very much in advance. class Search < ActiveRecord::Base def find_lifts scope = Lift.where('city_from_id = ?', self.city_from) #returns id of cities which are in range of given radius @cities_in_range_from = City.location_ids_in_range(self.city_from, self.radius_from) #adds where condition based on cities in range for city in @cities_in_range_from scope = scope.where('city_from_id = ?', city) #something like scope.or('city_from_id = ?', city) would be nice.. end end

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  • How do I find out if the variable is declared in Python?

    - by golergka
    I want to use a module as a singleton referenced in other modules. It looks something like this (that's not actually a code I'm working on, but I simplified it to throw away all unrelated stuff): main.py import singleton import printer def main(): singleton.Init(1,2) printer.Print() if __name__ == '__main__': pass singleton.py variable1 = '' variable2 = '' def Init(var1, var2) variable1 = var1 variable2 = var2 printer.py import singleton def Print() print singleton.variable1 print singleton.variable2 I expect to get output 1/2, but instead get empty space. I understand that after I imported singleton to the print.py module the variables got initialized again. So I think that I must check if they were intialized before in singleton.py: if not (variable1): variable1 = '' if not (variable2) variable2 = '' But I don't know how to do that. Or there is a better way to use singleton modules in python that I'm not aware of :)

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  • is an instance variable in an action of a controller available for all the controllers view?

    - by fenec
    I am just trying to printout the parameters that have been entered into my form. basically i create a new bet then i display the parameters: MIGRATION enter code here class CreateBets < ActiveRecord::Migration def self.up create_table :bets do |t| t.integer :accepted ,:default = 0 t.integer :user_1_id #proposer t.integer :user_2_id #receiver t.integer :team_1_id #proposer's team t.integer :team_2_id #receiver's team t.integer :game_id t.integer :winner t.integer :amount t.timestamps end end def self.down drop_table :bets end end CONTROLLER bets_controller.erb enter code here class BetsController < ApplicationController def index redirect_to new_bet_path end def new @b=Bet.new end def create @@points=params[:points] @@winner=params[:winner] end end VIEWS New.erb New Bet <% facebook_form_for Bet.new do |f| %> <%= f.text_field :amount, :label=>"points" %> <%= f.text_field :winner, :label=>"WinningTeam" %> <%= f.buttons "Bet" %> <% end %> create.erb enter code here points:<%= @@points %> <br> winner:<%= @@winner %>

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  • Creating a variable-speed slideshow based on USB input on OSX.

    - by Dave A
    I have a friend who is trying to put together a geeky little contraption for a wedding, where people can view a slideshow. Neither of us use Macs, nor have programmed for one, but for various reasons it has to run on a Mac. There will be a USB ammeter hooked up to a bike dynamo. What we want is for a slideshow to be run, and advance at a speed relative to how fast someone is pedaling on a stationary bike. After much googling, it seems like we could load an iPhoto slideshow up via applescript. Is it possible to pause the slideshow and advance it with keypress commands? The applescript commands would be run via a bash script or similar that would monitor the value returned by the USB ammeter's command-line app and issue the keypress events accordingly. Is there some other app that could be likewise scripted to display photos?Hoping someone has some hints to get us started in the right direction! Thanks!

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  • What's the environment variable for the path to the desktop?

    - by Scott Langham
    I'm writing a Windows batch file and want to copy something to the desktop. I think I can use this: %UserProfile%\Desktop\ However, I'm thinking, that's probably only going to work on an English OS. Is there a way I can do this in a batch file that will work on any internationalized version? UPDATE I tried the following batch file: REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop FOR /F "usebackq tokens=3 skip=4" %%i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop`) DO SET DESKTOPDIR=%%i FOR /F "usebackq delims=" %%i in (`ECHO %DESKTOPDIR%`) DO SET DESKTOPDIR=%%i ECHO %DESKTOPDIR% And got this output: S:\REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders Desktop REG_EXPAND_SZ %USERPROFILE%\Desktop S:\FOR /F "usebackq tokens=3 skip=4" %i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folder s" /v Desktop`) DO SET DESKTOPDIR=%i S:\FOR /F "usebackq delims=" %i in (`ECHO ECHO is on.`) DO SET DESKTOPDIR=%i S:\SET DESKTOPDIR=ECHO is on. S:\ECHO ECHO is on. ECHO is on.

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  • How do I get user input to refer to a variable in Python?

    - by somefreakingguy
    I would like to get user input to refer to some list in my code. I think it's called namespace? So, what would I have to do to this code for me to print whatever the user inputs, supposing they input 'list1' or 'list2'? list1 = ['cat', 'dog', 'juice'] list2 = ['skunk', 'bats', 'pogo stick'] x = raw_input('which list would you like me to print?') I plan to have many such lists, so a series of if...then statements seems unruly.

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  • R Question. Numeric variable vs. Non-numeric and "names" function

    - by Michael
    > scores=cbind(UNCA.score, A.score, B.score, U.m.A, U.m.B) > names(scores)=c('UNCA.scores', 'A.scores', 'B.scores','UNCA.minus.A', 'UNCA.minus.B') > names(scores) [1] "UNCA.scores" "A.scores" "B.scores" "UNCA.minus.A" "UNCA.minus.B" > summary(UNCA.scores) X6.69230769230769 Min. : 4.154 1st Qu.: 7.333 Median : 8.308 Mean : 8.451 3rd Qu.: 9.538 Max. :12.000 > is.numeric(UNCA.scores) [1] FALSE > is.numeric(scores[,1]) [1] TRUE My question is, what is the difference between UNCA.scores and scores[,1]? UNCA.scores is the first column in the data.frame 'scores', but they are not the same thing, since one is numeric and the other isn't. If UNCA.scores is just a label here how can I make it be equivalent to 'scores[,1]? Thanks!

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  • How can I alter an external variable from inside my AJAX?

    - by tmedge
    I keep on having these same two problems. I have been trying to use Remy Sharp's wonderful tagSuggest plugin, and it works great. Until I try to use an AJAX call to get tags from my database. My setGlobalTags() works great, with my defined myTagList at the top of the function. What I want to do is set myTagList equal to the result from my AJAX. My problem is that I can neither call setGlobalTags() from inside my success or error functions, nor actually alter the original myTagList. Also, I keep on having this other issue as well. I keep this code in my Master page, and my AJAX returns 'success' on almost every page. I only (and always) get the error alert when I navigate to a page that actually contains something of id="ParentTags". I don't see why this is happening, because my $('#ParentTags').tagSuggest(); is definitely after my AJAX call. I realize that this is probably just some dumb conventions error, but I am new to this and I'm here to learn from you guys. Thanks in advance! $(function() { var myTagList = ['test', 'testMore', 'testALot']; $.ajax({ type: "POST", url: 'Admin/GetTagList', dataType: 'json', success: function(resultTags) { myTagList = resultTags; alert(myTagList[0]); setGlobalTags(myTagList); }, error: function() { alert('Error'); setGlobalTags(myTagList); } }); setGlobalTags(myTagList); $('#ParentTags').tagSuggest(); });

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