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  • Rails forms: render different actions based on validation

    - by Martin Petrov
    Is it possible to render different actions based on what fails at validation? For example - I have one field in the form - email addres. It is validated like this: validates :email, :presence => true, :uniqueness => { :case_sensitive => false } In the controller: def create @user = User.new(params[:user]) if @user.save redirect_to somewhere else # render :new if email is blank # redirect_to somwhere if email is taken end end

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  • Consuming REST based web services in .Net

    - by steve
    Greetings, I'm confused as to the best approach to make when consuming REST based web services with .Net. At the moment I'm using the System.net.webclient class. Should I be using Webresponse, webrequest classes in System.Net ? If I were to use another approach (Other than webclient) what disadvantages / advantages would I gain ? Thanks,

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  • iphone view-based app

    - by ms
    I've created a view based application and have connected all of my buttons through Interface Builder (and saved)...however upon launch all I have is a white screen on the simulator. I've uncommented the viewDidLoad, and my header file has IBOutlet UIlabels defined. I'm kind of baffled.

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  • If I use my own normal values, should I turn off winding order culling?

    - by Phil
    I've discovered that I managed to program a series of boxes with indexed vertices in such a way that every other triangle (Half of each face) has a backwards winding order. As a result, XNA is culling half of them. However, my Vertex objects contain normal data that I have explicitly set, and I am going to implement my own backface culling shortly to reduce the size of the VertexBuffer. Should I turn off winding order culling and manage it myself, or should I make sure the winding order is consistent and let XNA handle it?

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  • How to turn off Libnotify notifications only when sound is in muted state?

    - by Michael Butler
    I have a multimedia keyboard that allows me to easily mute the sound (Ubuntu 12.04). It would be nice to "link" this to also turn off libnotify messages that pop-up in the top right corner (i.e. Pidgin messages). So when Ubuntu is muted, no libnotify messages would pop up. When not muted, messages show as normal. Is this possible with a script of some kind or would it require changing source code?

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  • How to determine which thrusters to turn on to rotate the ship?

    - by migimunz
    The configuration of the ship changes dynamically, so I have to determine which thruster to turn on when I want to rotate the ship clockwise or counter clockwise. The thrusters are always axis aligned with the ship (never at an angle) and are either on or off. Here's one of the possible setups: What I've tried so far is to visualize the firing vector and the direction vector to the center of mass of the ship: Unfortunately, I didn't get very far with that.

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  • Can I turn off global menu only in Nautilus?

    - by Syzygy
    According to post #15 of this Ubuntu Forums thread about Nautilus being slow, turning off global menu speeds Nautilus up significantly. This is certainly true for me, as running Nautilus as root makes it a few times (!) faster (with no gnome-scripts installed, cache cleared, Dropbox turned off). Now, I like the global menu--but I also want Nautilus to be fast! Is there a way to turn off the global menu only for Nautilus?

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  • Is there a way to turn off the sound that plays when my computer reconnects to the wireless network?

    - by Dan Tao
    I know this seems silly. Obviously I could mute my computer, or turn the speakers off. But it seems like surely there should be a way that I can keep all of my normal computer sounds without having to hear this one sound (no, it doesn't really bother me; mostly my wife just wants me to turn it off because she finds it annoying). I tried right-clicking on the volume icon in the notification area and went through all of the sounds in the list, thinking I could find the one offending noise and just turn it off. But none of them seem to correspond to the sound that plays when my wireless adapter randomly disconnects and reconnects to the wireless network.

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  • Laptop GPU apparently blew up, motherboard doesn't even turn on its power LED. [But..]

    - by leladax
    If I take out the GPU, the motherboard LED turns on but then [if it attempts to power up and boot] it turns off after 2 seconds [fans turn on normally in that short period]. [Without the GPUs out there's not even an attempt to boot.] It's an SLI motherboard for a toshiba (model X200-219). If I take out one of the GPUs (they are on top of each other) it surprisingly lets the motherboard turn on too (as it is if both are out) but it still turns off after 2-3 seconds, same behavior. I wonder if it's the GPU that produces the 'turn off after being on' behavior and not something else. [Has anyone seen this behavior with blown up GPUs or could it be something else?]

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  • Why would my domain admins turn off UAC? [closed]

    - by DanO
    I'm a developer of internal software in our company, I've gotten used to UAC in Win7, I prefer to run with in enabled so that our software works correctly with it enabled. Sysadmins have recently pushed out GPO that turns it off every time we log-in. (So I turn it back on every time I log in.) I can imagine some people are annoyed by it and turn it off, but is that really a good company-wide decision? anyone annoyed by it (local admins) would already have permission to turn it of themselves.. right? On the other hand we don't have to worry creating UAC friendly software if no workstations or servers have it enabled. Is there a good reason for doing this? Other than reducing help-desk calls from users recently upgraded from XP? I can't see the upside of this decision, help me understand.

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  • MySQL use certain columns, based on other columns

    - by Rabbott
    I have this query: SELECT COUNT(articles.id) AS count FROM articles, xml_documents, streams WHERE articles.xml_document_id = xml_documents.id AND xml_documents.stream_id = streams.id AND articles.published_at BETWEEN '2010-01-01' AND '2010-04-01' AND streams.brand_id = 7 Which just uses the default equajoin by specifying three tables in csv format in the FROM clause.. What I need to do is group this by a value found within articles.source (raw xml).. so it could turn into this: SELECT COUNT(articles.id) AS count, ExtractValue(articles.source, "/article/media_type") AS media_type FROM articles, xml_documents, streams WHERE articles.xml_document_id = xml_documents.id AND xml_documents.stream_id = streams.id AND articles.published_at BETWEEN '2010-01-01' AND '2010-04-01' AND streams.brand_id = 7 GROUP BY media_type which works fine, the problem is, I'm using rails, and using STI for the xml_documents table. The articles.source that is provided to the ExtractValue method will be of a couple different formats.. So what I need to be able to do is use "/article/media_type" IF xml_documents.type = 'source one' and use "/article/source" if xml_documents.type = 'source two' This is just because the two document types format their XML differently, but I don't want to have to run multiple queries to retrieve this information.. It would be nice if one could use a ternary operator, but i don't think this is possible.. EDIT At this Point I am looking at making a temp table, or simply using UNION to place multiple result sets together..

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  • Boost Solr results based on the field that contained the hit

    - by TomFor
    Hi, I was browsing the web looking for a indexing and search framework and stumbled upon Solr. A functionality that we abolutely need is to boost results based on what field contained the hit. A small example: Consider a record like this: <movie> <title>The Dark Knight</title> <alternative_title>Batman Begins 2</alternative_title> <year>2008</year> <director>Christopher Nolan</director> <plot>Batman, Gordon and Harvey Dent are forced to deal with the chaos unleashed by an anarchist mastermind known only as the Joker, as it drives each of them to their limits.</plot> </movie> I want to combine for example the title, alternative_title and plot fields into one search field, which isn't too difficult after looking at the Solr/Lucene documentation and tutorials. However I also want that movies that have a hit in title have a higher score than hits on alternative_title and those in their turn should score higher than hits in the plot field. Is there any way to indicate this kond of scoring in the xml or do we need to develop some custom scoring algorythm? Please also note that the example I've givnen is fictional end the real data will probably contain 100+ fields. Thanks in advance, Tom

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  • In WPF, Selecting ItemContainerStyle based on data bound content

    - by Bart Roozendaal
    In #WPF you have ItemTemplateSelectors. But, can you also select an ItemContainerStyle based on the datatype of a bound object? I am databinding a scatterview. I want to set some properties of the generated ScatterViewItems based on the object in their DataContext. A mechanism similar to ItemTemplateSelector for styles would be great. Is that at all possible? I am now binding to properties in the objects that I am displaying to get the effect, but that feels like overhead and too complex (and most importantly, something that our XU designers can't do by themselves). This is the XAML that I am using now. Your help is greatly appreciated. <s:ScatterView x:Name="topicsViewer"> <s:ScatterView.ItemTemplateSelector> <local:TopicViewerDataTemplateSelector> <DataTemplate DataType="{x:Type mvc:S7VideoTopic}"> <Grid> <ContentPresenter Content="{Binding MediaElement}" /> <s:SurfaceButton Visibility="{Binding MailToVisible}" x:Name="mailto" Tag="{Binding Titel}" Click="mailto_Click" HorizontalAlignment="Right" VerticalAlignment="Top" Background="Transparent" Width="62" Height="36"> <Image Source="/Resources/MailTo.png" /> </s:SurfaceButton> <StackPanel Orientation="Horizontal" VerticalAlignment="Bottom" HorizontalAlignment="Center" Height="32"> <s:SurfaceButton Tag="{Binding MediaElement}" x:Name="btnPlay" Click="btnPlay_Click"> <Image Source="/Resources/control_play.png" /> </s:SurfaceButton> <s:SurfaceButton Tag="{Binding MediaElement}" x:Name="btnPause" Click="btnPause_Click"> <Image Source="/Resources/control_pause.png" /> </s:SurfaceButton> <s:SurfaceButton Tag="{Binding MediaElement}" x:Name="btnStop" Click="btnStop_Click"> <Image Source="/Resources/control_stop.png" /> </s:SurfaceButton> </StackPanel> </Grid> </DataTemplate> <DataTemplate DataType="{x:Type mvc:S7ImageTopic}"> <Grid> <ContentPresenter Content="{Binding Resource}" /> <s:SurfaceButton Visibility="{Binding MailToVisible}" x:Name="mailto" Tag="{Binding Titel}" Click="mailto_Click" HorizontalAlignment="Right" VerticalAlignment="Top" Background="Transparent" Width="62" Height="36"> <Image Source="/Resources/MailTo.png" /> </s:SurfaceButton> </Grid> </DataTemplate> <DataTemplate DataType="{x:Type local:Kassa}"> <ContentPresenter Content="{Binding}" Width="300" Height="355" /> </DataTemplate> </local:TopicViewerDataTemplateSelector> </s:ScatterView.ItemTemplateSelector> <s:ScatterView.ItemContainerStyle> <Style TargetType="s:ScatterViewItem"> <Setter Property="MinWidth" Value="200" /> <Setter Property="MinHeight" Value="150" /> <Setter Property="MaxWidth" Value="800" /> <Setter Property="MaxHeight" Value="700" /> <Setter Property="Width" Value="{Binding DefaultWidth}" /> <Setter Property="Height" Value="{Binding DefaultHeight}" /> <Setter Property="s:ScatterViewItem.CanMove" Value="{Binding CanMove}" /> <Setter Property="s:ScatterViewItem.CanScale" Value="{Binding CanScale}" /> <Setter Property="s:ScatterViewItem.CanRotate" Value="{Binding CanRotate}" /> <Setter Property="Background" Value="Transparent" /> </Style> </s:ScatterView.ItemContainerStyle> </s:ScatterView> Bart Roozendaal, Sevensteps

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  • Re-using aggregate level formulas in SQL - any good tactics?

    - by Cade Roux
    Imagine this case, but with a lot more component buckets and a lot more intermediates and outputs. Many of the intermediates are calculated at the detail level, but a few things are calculated at the aggregate level: DECLARE @Profitability AS TABLE ( Cust INT NOT NULL ,Category VARCHAR(10) NOT NULL ,Income DECIMAL(10, 2) NOT NULL ,Expense DECIMAL(10, 2) NOT NULL ) ; INSERT INTO @Profitability VALUES ( 1, 'Software', 100, 50 ) ; INSERT INTO @Profitability VALUES ( 2, 'Software', 100, 20 ) ; INSERT INTO @Profitability VALUES ( 3, 'Software', 100, 60 ) ; INSERT INTO @Profitability VALUES ( 4, 'Software', 500, 400 ) ; INSERT INTO @Profitability VALUES ( 5, 'Hardware', 1000, 550 ) ; INSERT INTO @Profitability VALUES ( 6, 'Hardware', 1000, 250 ) ; INSERT INTO @Profitability VALUES ( 7, 'Hardware', 1000, 700 ) ; INSERT INTO @Profitability VALUES ( 8, 'Hardware', 5000, 4500 ) ; SELECT Cust ,Profit = SUM(Income - Expense) ,Margin = SUM(Income - Expense) / SUM(Income) FROM @Profitability GROUP BY Cust SELECT Category ,Profit = SUM(Income - Expense) ,Margin = SUM(Income - Expense) / SUM(Income) FROM @Profitability GROUP BY Category SELECT Profit = SUM(Income - Expense) ,Margin = SUM(Income - Expense) / SUM(Income) FROM @Profitability Notice how the same formulae have to be used at the different aggregation levels. This results in code duplication. I have thought of using UDFs (either scalar or table valued with an OUTER APPLY, since many of the final results may share intermediates which have to be calculated at the aggregate level), but in my experience the scalar and multi-statement table-valued UDFs perform very poorly. Also thought about using more dynamic SQL and applying the formulas by name, basically. Any other tricks, techniques or tactics to keeping these kinds of formulae which need to be applied at different levels in sync and/or organized?

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  • C# Inheritence: Choosing what repository based on type of inherited class

    - by Oskar Kjellin
    I have been making a program that downloads information about movies from the internet. I have a base class Title, which represents all titles. Movie, Serie and Episode are inherited from that class. To save them to the database I have 2 services, MovieService and SerieService. They in turn call repositories, but that is not important here. I have a method Save(Title title) which I am not very happy with. I check for what type the title is and then call the correct service. I would like to perhaps write like this: ITitleService service = title.GetService(); title.GetSavedBy(service); So I have an abstract method on Title that returns an ITitleSaver, which will return the correct service for the instance. My question is how should I implement ITitleSaver? If I make it accept Title I will have to cast it to the correct type before calling the correct overload. Which will lead to having to deal with casting once again. What is the best approach to dealing with this? I would like to have the saving logic in the corresponding class.

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  • Translating multiple objects in GUI based on average position?

    - by user1423893
    I use this method to move a single object in 3D space, it accounts for a local offset based on where the cursor ray hits the widget and the center of the widget. var cursorRay = cursor.Ray; Vector3 goalPosition = translationWidget.GoalPosition; Vector3 position = cursorRay.Origin + cursorRay.Direction * grabDistance; // Constrain object movement based on selected axis switch (translationWidget.AxisSelected) { case AxisSelected.All: goalPosition = position; break; case AxisSelected.None: break; case AxisSelected.X: goalPosition.X = position.X; break; case AxisSelected.Y: goalPosition.Y = position.Y; break; case AxisSelected.Z: goalPosition.Z = position.Z; break; } translationWidget.GoalPosition = goalPosition; Vector3 p = goalPosition - translationWidget.LocalOffset; objectSelected.Position = p; I would like to move multiple objects based on the same principle and using a widget which is located at the average position of all the objects currently selected. I thought that I would have to translate each object based on their offset from the average point and then include the local offset. var cursorRay = cursor.Ray; Vector3 goalPosition = translationWidget.GoalPosition; Vector3 position = cursorRay.Origin + cursorRay.Direction * grabDistance; // Constrain object movement based on selected axis switch (translationWidget.AxisSelected) { case AxisSelected.All: goalPosition = position; break; case AxisSelected.None: break; case AxisSelected.X: goalPosition.X = position.X; break; case AxisSelected.Y: goalPosition.Y = position.Y; break; case AxisSelected.Z: goalPosition.Z = position.Z; break; } translationWidget.GoalPosition = goalPosition; Vector3 p = goalPosition - translationWidget.LocalOffset; int numSelectedObjects = objectSelectedList.Count; for (int i = 0; i < numSelectedObjects; ++i) { objectSelectedList[i].Position = (objectSelectedList[i].Position - translationWidget.Position) + p; } This doesn't work as the object starts shaking, which I think is because I haven't accounted for the new offset correctly. Where have I gone wrong?

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  • Is this way of storing typed objects in memory good?

    - by Pindatjuh
    This is an "is this okay, or can it be done better" question. Topic: Storing typed objects in memory. Background information: I'm building a compiler for the x86-32 platform for my language. My goal includes typed objects. Idea: Every primitive is a semi-class (it can be used as if it was a normal class, but it's stored more compact). Every class is represented by primitives and some meta-data (containing class-properties, inheritance stuff, etc.). The meta-data is complex: it doesn't use fields but instead context-switches. For primitives, the meta-data is very small, compared to a "real" class, which is alot bigger. This enables another idea that "primitives are objects", in my language, which I found nessecairy. Example: If I have an array of 32 booleans, then the pure content of this array is exactly 4 byte (32 bits of booleans). The meta-data will contain flags that the type is an array of booleans, which contains 32 entries. The meta-data is very compacted, on bit-level: using a sort of "packing" mechanism, which is read by a FSM at runtime, when doing inspection of the type (like when passing the object to methods for checking, etc.) For instance (read from left to right, top to bottom, remember vertical possition when going to the right, and check nearest column header for meaning of switch): Primitive? Array? Type-Meta 1 Byte? || Size (1 byte) 1 1 [...] 1 [...] done 0 2 Bytes? || Size (2 bytes) 1 [...] done || Size (4 bytes) 0 [...] done Integer? 1 Byte? 2 Bytes? 0 1 0 1 done 1 done 0 done Boolean? Byte? 0 1 0 done 1 done More-Primitives 0 .... Class-Stuff (Huge) 0 ... (After reaching done the data is inserted. || = byte alignement. [...] is variable sized. ... is not described here, for simplicity. And let's call them cost-based-data-structures.) For an array of 32 booleans containing all true values, the memory for this type would be (read top-down): 1 Primitive 1 Array 1 ArrayType: Primitive 0 Not-Array 0 Not-Integer 1 Boolean 0 Not-Byte (thus bit) 1 Integer Size: 1 Byte 00100000 Array size 11111111 11111111 11111111 11111111 Data Thus, 8 bytes represent 32 booleans in an array: 11100101 00100000 11111111 11111111 11111111 11111111 Is this okay, or can it be done better?

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  • ASP.NET: Dynamically enable or disable RequiredFieldValidator based on value of DropDownList

    - by Jeremy
    I have an ASP.NET form with three text inputs, one each for "Work Phone", "Home Phone" and "Cell Phone". Each of these text inputs has a RequiredFieldValidator associated with it. I also have a DropDownList where the user can select the preferred phone type. I want to only require the field that is selected in the DropDownList. For example, if the user selects "Work Phone" from the DropDownList, I want to disable the RequiredFieldValidator for "Home Phone" and "Cell Phone", thereby only making the "Work Phone" field required. I have a method that enables and disables these validators based on the value of the DropDownList, but I cannot figure out when to call it. I want this method to run before the validation takes place on the page. How would I do that? Let me know if you need any more information. Thanks.

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  • Component based game engine design

    - by a_m0d
    I have been looking at game engine design (specifically focused on 2d game engines, but also applicable to 3d games), and am interested in some information on how to go about it. I have heard that many engines are moving to a component based design nowadays rather than the traditional deep-object hierarchy. Do you know of any good links with information on how these sorts of designs are often implemented? I have seen evolve your hierarchy, but I can't really find many more with detailed information (most of them just seem to say "use components rather than a hierarchy" but I have found that it takes a bit of effort to switch my thinking between the two models). Any good links or information on this would be appreciated, and even books, although links and detailed answers here would be preferred.

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  • Display Time Based Gannt charts using JavaScript

    - by Hari
    Hi All, We are using fusion charts for time based gantt charts. But these charts are not getting displayed as they require flash plug-in which is not supproted by iPhone. So I'm looking for pure javascript charts to get the same type of charts but I have not found any! I would appreciate if you can point me to right direction. If there are no such links then ,please let me know how we can create these type of charts using JS. I'm looking for following type of charts http://www.fusioncharts.com/widgets/Gallery/Gantt11.html?width=650&height=490 Thanks, Hari

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  • WPF - DataGrid Column's ToolTip visibility based on the column's data length

    - by S.C.Vidhya
    In my application, i have tried to implement the visibility of tooltip based on the dataGrid Column's text length by using a converter. I am facing some problems in displaying the toolTip text. In the ToolTip, TextBlock's text binding is not working. If its binded with some hard coded strings, it works fine. Here below is the code that i have added for the grid column... <Custom:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding Text}"> <TextBlock.ToolTip> <ToolTip DataContext="{Binding Path=PlacementTarget, RelativeSource={x:Static RelativeSource.Self}}" Visibility="{Binding Converter={StaticResource ToolTipVis}}"> <TextBlock Text="{Binding Text}"> </ToolTip> </TextBlock.ToolTip> </TextBlock> </DataTemplate> </Custom:DataGridTemplateColumn.CellTemplate>

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  • Winforms role based security limitations

    - by muhan
    I'm implementing role based security using Microsoft's membership and role provider. The theoretical problem I'm having is that you implement a specific role on a method such as: [PrincipalPermissionAttribute(SecurityAction.Demand, Role="Supervisor")] private void someMethod() {} What if at some point down the road, I don't want Supervisors to access someMethod() anymore? Wouldn't I have to change the source code to make that change? Am I missing something? It seems there has to be some way to abstract the relationship between the supervisors role and the method so I can create a way in the application to change this coupling of role permission to method. Any insight or direction would be appreciated. Thank you.

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  • WCF Data Services consuming data from EF based repository

    - by John Kattenhorn
    We have an existing repository which is based on EF4 / POCO and is working well. We want to add a service layer using WCF Data Services and looking for some best practice advice. So far we have developed a class which has a IQueryable property and the getter triggers the repository 'get all users' method. The problem so far have been two-fold: 1) It required us to decorate the ID field of the poco object to tell data service what field was the id. This now means that our POCO object is not 'pure'. 2) It cannot figure out the relationships between the objects (which is obvious i guess). I've now stopped this approach and i'm thinking that maybe we should expose the OBjectContext from the repository and use more 'automatic' functionality of EF. Has anybody got any advice or examples of using the repository pattern with WCF Data Services ?

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  • Setting a WebControls TabIndex based on the ControlId of another control

    - by Daniel Ballinger
    I have an ASP.NET Webforms site that is regularly having features added. The majority of time a new WebControl is added to the page and I need to increment the TabIndex to all subsequent controls on the page. I'd prefer a more robust solution than choosing an arbitrary gap between the initial assigned tab indexes. Setting the tab indexes using the designer tab order functionality is one option but I'd prefer to stay in the source view. Ideally, if I had three check boxes I'd like to be able to define the tabindex based off the previous controls tabindex. Then I'd only need to insert the new control and change one existing control. <asp:CheckBox ID="checkBoxA" runat="server" TabIndex="0"/> <asp:CheckBox ID="checkBoxB" runat="server" TabIndexAfterControlId="checkBoxA"/> <asp:CheckBox ID="checkBoxC" runat="server" TabIndexAfterControlId="checkBoxB"/> My first thought was to extend System.Web.UI.WebControls.WebControl with a new property, but extension properties aren't supported.

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