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• Rails 2.3 - Storing sessions in different schema

  - by sa125

  Hi - I want to config my app to use a different schema than the default for storing sessions. Basically, I want the app to store all its active_record objects in app_development and only its sessions in app_sessions. Normally this could be done by defining the sessions db in database.yml: development: # ... sessions: host: localhost database: app_sessions username: blah password: sssshhh #.... And then setting in the model: class Session < ActiveRecord::Base establish_connection :sessions #... end But since session doesn't have a model class defined, I'm looking for a way to tell it where to store its data. I've noticed the session comes from ActionController::Session, but couldn't find what I needed there. Any thoughts? thanks.

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• perl escaping \n or \t

  - by Michael

  I need to escape \n so on output I really get newline or tab $ perl -p -e 's/e/a/ge' now I want each e to be substituted with \n $ perl -p -e 's/e/\n/ge' but even \n gives me an error. this was a simplified example. In real script(makefile) I have substitute := perl -p -e 's/@([^@]+)@/defined $$ENV{$$1} ? $$ENV{$$1} : $$1/ge' and in target I have such a nice command $(substitute) $< > $@ and if the input file for perl contains \n at output I will see it literally... I want to have real newline.

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• Custom Sorting on Custom Field in Django

  - by RotaJota

  In my app, I have defined a custom field to represent a physical quantity using the quantities package. class AmountField(models.CharField): def __init__(self, *args, **kwargs): ... def to_python(self, value): create_quantities_value(value) Essentially the way it works is it extends CharField to store the value as a string in the database "12 min" and represents it as a quantities object when using the field in a model array(12) * min Then in a model it is used as such: class MyModel(models.Model): group = models.CharField() amount = AmountField() class Meta: ordering = ['group', 'amount'] My issue is that these fields do not seem to sort by the quantity, but instead by the string. So if I have some objects that contain something like {"group":"A", "amount":"12 min"} {"group":"A", "amount":"20 min"} {"group":"A", "amount":"2 min"} {"group":"B", "amount":"20 min"} {"group":"B", "amount":"1 hr"} they end up sorted something like this: >>> MyModel.objects.all() [{A, 12 min}, {A, 2 min}, {A, 20 min}, {B, 1 hr}, {B, 20 min}] essentially alphabetical order. Can I give my custom AmountField a comparison function so that it will compare by the python value instead of the DB value?

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• How to style an asp.net menu with CSS

  - by md1337

  I'm in the process of styling an asp.net menu and I'm trying to understand the meaning of the StaticSelectedStyle-CssClass and StaticHoverStyle-CssClass parameters. My understanding is that the styles defined with these parameters are applied as CSS classes to the relevant elements, whenever needed. So I created my menu as follows: <asp:Menu ID="NavigationMenu" DataSourceID="NavigationSiteMapDataSource" StaticMenuStyle-CssClass="StaticMenuStyle" StaticMenuItemStyle-CssClass="StaticMenuItemStyle" StaticSelectedStyle-CssClass="StaticSelectedStyle" StaticHoverStyle-CssClass="StaticHoverStyle" Orientation="Horizontal" MaximumDynamicDisplayLevels="0" runat="server"> </asp:Menu> It works for StaticMenuStyle-CssClass and StaticMenuStyle-CssClass (the classes are applied to the relevant elements), but StaticSelectedStyle-CssClass and StaticHoverStyle-CssClass are not applied, regardless of the selected or hover status of an element. What am I supposed to do to make this work? Thanks.

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• CoffeeScript Class Properties Within Nested Anonymous Functions

  - by Aric

  I'm just taking a look at CoffeeScript for the first time so bare with me if this is a dumb question. I'm familiar with the hidden pattern methodology however I'm still wrapping my head around object prototypes. I'm trying to create a basic class for controlling a section on my site. The problem I'm running into is losing defined class variables within a different scope. For example, the code below works fine and creates the properties within the object perfectly. However when I jump into a jQuery callback I lose all knowledge of the class variables storing some of the jQuery objects for multiple uses. Is there a way to grab them from within the callback function? class Session initBinds: -> @loginForm.bind 'ajax:success', (data, status, xhr) -> console.log("processed") return @loginForm.bind 'ajax:before', (xhr, settings) -> console.log @loader // need access to Session.loader return return init: -> @loginForm = $("form#login-form") @loader = $("img#login-loader") this.initBinds() return

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• How do we calculate the filters in Mel-Frequency Cepstrum Coefficients Algorithm?

  - by André Ferreira

  After calculating the FFT and with the frequency we need to do something like this: http://instruct1.cit.cornell.edu/courses/ece576/FinalProjects/f2008/pae26%5Fjsc59/pae26%5Fjsc59/images/melfilt.png We filter the frequency spectrum with those triangles. I saw that we can use distint ways to calculcate the triangles. I will make the size of the triangles equal till 1kz and after that obtained with log function. What should we do now? With the frequency spectrum and the triangles defined.. - We should filter the frequency (frequencies limited to the triangles, if goes higher only counts till the triangle limit) and calculate the value of each triangle (and after that continue the algorithm). But when does the mel conversation happens? m = 2595 log (f/700 + 1) When do we pass from frequency to mel.. Can someone guide me in the right direction plz :d

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• RewriteCond and Alias

  - by Ralphz

  I have defined alias that looks like this: Alias /pictures/sm/ /var/www/my_site/data/_active_thumbnails/ Later in the VirtualHost section have: DocumentRoot /var/www/my_site/sites/www.my_site.com/htdocs RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^/thumbnails/(.*)\.(jpg|JPG) /images/stg-list-img.png [PT,L] What I'm trying to do is to display /images/stg-list-img.png placeholder image only if the original image does not exist on the drive. Right now it's replacing all the images from /thumbnails/. It looks like the RewriteCond is not aware about the Alias. Is there the way to overcome it? Thanks

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• Seeking Functional Programming Lexicon

  - by Randall Schulz

  Hi, Knowing the argot of a field helps me a lot, especially since it allows me to converse intelligently with those who know a lot more than I, so I would like to find a good lexicon of Functional Programming terms. E.g., I repeatedly encounter these: Functor, Arrow, Category, Kleisli, Monad, Monoid, a veritable zoo of Morphisms, etc. I also notice many of these appear with prefixes such as "covariant", "co-", "endo-" etc. Of these, I can say I actually understand Monoid and Covariant and sort of get Monad, but the rest are still gibberish to me. (Note that I don't mean this list as exhaustive and I'm not looking to have these defined or described for me here, I'm looking for learning resources.) Can someone point me towards an FP lexicon? It need not be on-line, as long as it's possible to find it (and it's not a rare volume for which I'd have to pay many tens of dollars).

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• What did I lose when I upgraded?

  - by Richard

  I upgraded my work box from Vista64 to Win7-64 by doing a format and reinstall. I kept backups of the project done in MS Visual Studio 2008 (Team). But now it won't compile. I am getting errors generated on lines in the MS created header files like "'_In_' not defined" etc. I know it is because I lost some compiler setting/directive. I was sure that the compiler settings would be in the project file; now I see that things like the include file directories, LIB files, etc. are not. [FYI: The project is a VB.NET GUI with VC++ DLL talking to a PIC24 micro over USB.] How do I most efficiently get my project back on the road to execution?

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• View problem - how to show integer from activity in XML?

  - by Oliver Goossens

  Hi there, I started two days ago with android, gone through the hello android stuff and also started to read the Hello Android book, which is great. PROBLEM: I use in my app - VERY EASY APP- the XML output. So basically the main activity just tells the android to show the XML layout of main. But what if I have in the activity - code defined integer variable and I want this integer variable also be shown on the display? How do I PUSH the integer variable to the XML??? From main XML reference to other strings in XML is easy - @string/app_name ... but how do I use the integer variable from the activity? Please help Thank you Oliver

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• Reflection and changing a variables type at runtime?

  - by james-west

  Hi I'm trying to create an object Of a specific type. I've got the following code, but it fails because it can't cast the new table object to the one that is already defined. I need table to start of an IEnumerable type so I can't declare is an object. Public sub getTable(ByVal t as Type) Dim table As Table(Of Object) Dim tableType As Type = GetType(Table(Of )).MakeGenericType(t) table = FormatterServices.GetUninitializedObject(tableType) End sub So in short - is there a way of changing a variable type at runtime? (or a better way of doing what I'm doing) Thanks in advance. James

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• Wpf: Tips for better performance

  - by viky

  I am working on a wpf application. In which I am working with a TreeView, each node represents different datatypes, these datatypes are having properties defined and using data template to show their properties. My application reads from xml and create tree accordingly. My problem is that when I load it, it is too slow, I want to know about the tricks that will help me to improve performance of my(any) wpf application. Edit: Please provide me some tips for better performance in wpf!! I am using wpf Profiler but it is not much helpful for me.

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• MVC ActionLink omits action when action equals default route value

  - by rjygraham

  I have the following routes defined for my application: routes.MapRoute( "Referral", // Route name "{referralCode}", // URL with parameters new { controller = "Home", action = "Index" } // Parameter defaults ); routes.MapRoute( "Default", // Route name "{controller}/{action}", // URL with parameters new { controller = "Home", action = "Index" } // Parameter defaults ); And I'm trying to create an ActionLink to go on the Index action on my AdminController: @Html.ActionLink("admin", "Index", "Admin") However, when the view is executed the ActionLink renders as (Index action value is omitted): <a href="/Admin">admin</a> Normally this would be ok, but it's causing a collision with the "Referral" route. NOTE: If I instead use ActionLink to render a different action like "Default," the ActionLink renders correctly: <a href="/Admin/Default">admin</a> The fact that the "Default" action renders correctly leads me to believe the problem has to do with the default value specified for the route. Is there anyway to force ActionLink to render the "Index" action as well?

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• Need help in gridview displaying data

  - by sumit

  Hi all, I want to display all the data in gridview which i am inserting in runtime. For that i have written code but getting this error. "Both DataSource and DataSourceID are defined on 'GridView1'. Remove one definition." protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { BindData(); } } public void BindData() { string str = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString(); SqlConnection con = new SqlConnection(str); SqlDataAdapter da = new SqlDataAdapter("select * from Items where ItemId='" + TxtItemId.Text + "'", con); DataSet ds = new DataSet(); da.Fill(ds,"Items"); GridView1.DataSource = ds; GridView1.DataBind(); } Pls modify my code where is my mistake. Thanks, Sumit

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• Setting HTML Text Element value

  - by Gpx

  Hi, in my C# WPF prog i´am trying to set a value of a HTML Text Element which is defined like: <input name="tbBName" type="text" id="tbBName" tabindex="1" /> What i found about it and tried is: mshtml.HTMLDocument doc = (mshtml.HTMLDocument)webBrowser1.Document; mshtml.HTMLInputTextElement tbName = (mshtml.HTMLInputTextElement)doc.getElementsByName("tbBName"); tbName.value = "Test"; But i got the exception: Unable to cast COM object of type 'System.__ComObject' to interface type 'mshtml.HTMLInputTextElement'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{3050F520-98B5-11CF-BB82-00AA00BDCE0B}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). I know what it says but i dont know which object i can use to access the Texbox. Thanks for any answers.

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• !(ReferenceEquals()) vs != in Entity Framework 4

  - by Eric J.

  Unless a class specifically overrides the behavior defined for Object, ReferenceEquals and == do the same thing... compare references. In property setters, I have commonly used the pattern private MyType myProperty; public MyType MyProperty { set { if (myProperty != value) { myProperty = value; // Do stuff like NotifyPropertyChanged } } } However, in code generated by Entity Framework, the if statement is replaced by if (!ReferenceEquals(myProperty, value)) Using ReferenceEquals is more explicit (as I guess not all C# programmers know that == does the same thing if not overridden). Is there any difference that's escaping me between the two if-variants? Are they perhaps accounting for the possibility that POCO designers may have overridden ==? In short, if I have not overridden ==, am I save using != instead of ReferencEquals()?

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• Are ORM's counterproductive to OO design?

  - by Jeremiah

  In OOD, design of an object is said to be characterized by its identity and behavior. Having used OR/M's in the past, the primary purpose, in my opinion, revolves around the ability to store/retrieve data. That is to say, OR/M objects are not design by behavior, but rather data (i.e. database tables). Case and point: Many OR/M tools come with a point-to-a-database-table-and-click-object-generator. If objects are no longer characterized by behavior this will, in my opinion, muddy the identity and responsibility of the objects. Subsequently, if objects are not defined by a responsibility this could lend a hand to having tightly coupled classes and overall poor design. Furthermore, I would think that in an application setting, you would be heading towards scalability issues. So, my question is, do you think that ORM's are counterproductive to OO design? Perhaps the underlying question would be whether or not they are counterproductive to application development.

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• Scala type conversion error, need help!

  - by Mansoor Ashraf

  Hello I am getting a weird error when trying to use a Java map in Scala. This is the snippet of code val value:Double = map.get(name) if (value eq null) map.put(name, time) else map.put(name, value + time) the map is defined as val map=new ConcurrentHashMap[String,Double] and this is the error I am getting error: type mismatch; found : Double required: ?{val eq: ?} Note that implicit conversions are not applicable because they are ambiguous: both method double2Double in object Predef of type (Double)java.lang.Double and method doubleWrapper in object Predef of type (Double)scala.runtime.RichDouble are possible conversion functions from Double to ?{val eq: ?} if (value eq null) map.put(name, time) I am new to Scala so I am having a hard time parsing the stacktrace. Any help would be appreciated

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• Activator.CreateInstance(Type) for a type without parameterless constructor

  - by Seb

  Reading existing code at work, I wondered how come this could work. I have a class defined in an assembly : [Serializable] public class A { private readonly string _name; private A(string name) { _name = name; } } And in another assembly : public void f(Type t) { object o = Activator.CreateInstance(t); } and that simple call f(typeof(A)) I expected an exception about the lack of a parameterless constructor because AFAIK, if a ctor is declared, the compiler isn't supposed to generate the default public parameterless constructor. This code runs under .NET 2.0.

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• asp.net mvc2 ajax.actionlink is not working refresh problem

  - by mazhar kaunain baig

  has someone make ajax.actionlink for delete to work properly.After deleting the record successfully at the end it is not refreshing the page properly. the page refresh is my problem. i have defined the updatetarget id and returning view(model) from my controller but it is returning the master page with it. So the thing is that i am having a page with a page.I have used redirect as well which is not refreshing, <%= Ajax.ActionLink("Delete", "Delete", new { id = item.int_OrganizationGroupId }, new AjaxOptions { UpdateTargetId = "abc", HttpMethod = "Post", Confirm = "Delete Group with Organization Group ID:" + item.int_OrganizationGroupId + " Organization Group Name:" + item.vcr_OrganizationGroupName, OnSuccess = "handleSuccess" })%>| abc is the id of the table From controller View("ManageGroup,Model);

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• How do I write x86 Debug registers from user space on OSX?

  - by nall

  I'd like to play around with the debug MSRs defined in the x86 spec (DR0-7) from my OSX user-space program. Unfortunately, these require CPL == 0 (aka ring 0). I've thumbed through the OSX syscalls and with the exception of kernel_debug nothing really jumps out as a way to access these. It may be the case that they are only available via some higher level interface like kernel_debug, but it's unclear to me if that's the case or if I just haven't found the magic invocation to get to them. Anyone know how to do this?

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• Buddypress on local server install has issues

  - by meds

  I have buddypress working nicely on a server, however I can't display the 'members' page or any individual profile page on a local webserver install I have made. If I try and visit /members/ I just get redirected back to the main buddypress page. I also just noticed online members never shows whose online and the link to the default blog on the main page is listed as http://localhost.localdomain/mu/BP_HOME_BLOG_SLUG which seems to indicate to me that BP_HOME_BLOG_SLUG is undefined, I can't find where it gets set or defined, not sure if these two problems are related to the other problems. No idea what's causing it, I've been pouring over the php files but haven't even gotten a clue, any suggestions on what I could do?

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• Error details in embedded IronPython

  - by Achim

  Hi, I'm executing IronPython in my application. A script produces an UnboundNameException with the message "name 'source' is not defined". Because the script is correct in my opinion I would need more error information, but I'm not able to get them from the exception. The exception itself seems not to contain any information about line number of the source of the exception or something like this. I searched on Google, but all available information seems to be outdated. The Data dictionary of my exception is empty which means that Data["PythonExceptionInfo"] does not exist. The file version of my IronPython assembly is 2.0.20209.0 Any hint how to get more error details? cheers, Achim

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• graphics don't draw when loop condition is dates. c#, winForms

  - by jello

  so i got this piece of code. (currPosX is defined earlier) while (earliestDate < DateTime.Today) { currPosX = currPosX + 5; e.Graphics.DrawLine(Pens.Black, currPosX, 0, currPosX, 10); earliestDate = earliestDate.AddDays(1); } the graphics don't draw. it's really weird, since this only happens when the condition statement is a date comparison. I debugged, and it does go in the loop, and the values are messed with (currPosX for example). But, no display. one more weirdness, if I add a MessageBox.Show("blabla") in the loop, the message box pops up, and graphics are drawn. what's going on here?

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• Is it possible to load ListPreference items from an adapter?

  - by Brad Hein

  I'm setting out to create a settings activity for my app. I've defined a PreferenceActivity with a nice layout including a ListPreference object for the user to select a bluetooth device. I'm having trouble dynamically populating the list. I would like to populate ListPreference with values from an array adapter (which I'll create and populate with relevant bluetooth device names). If this were a spinner View, I could just call setAdapter(). However with the ListPreference object I can't figure out how to attach an adapter (findviewByID won't cast from View To ListPreference, so I can't even get a handle to the object). I would like to attach an adapter and then populate the adapter with values, which in turn would populate the ListPreference with values.

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