Databases
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USTodd J.
 

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  1. USTodd J.
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    1. This table or related slice is empty.
    1. POWHERE clause fails with certain string literals
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      1. PTQuestion
    2. POWhy is the model null when using default routing in ASP.NET MVC?
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    3. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. CONo, I don't have an idea of which class is causing the problem. Sometimes it is a loop of releases, and sometimes it is a loop of retains. There is no consistent set of steps to reproduce the problem. The app depends heavily on downloading data from a web service. The time I was able to reproduce the error, I started the app on wifi, backgrounded it, turned off wifi, waited 30 minutes, then brought it back to the foreground. I have run Instruments, as well as the memory management diagnostics. I can't use the simulator because my current testing relies on having a cellular connection.
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      1. POARC stuck in infinite retain or release loop
      1. USTodd J.
    2. CO@StevenBerkovitz, it may be that the Model is not null, but the chart property is. This is the call stack: [NullReferenceException: Object reference not set to an instance of an object.] System.Web.UI.DataVisualization.Charting.ChartHttpHandler.GetHandlerUrl() +67 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.GetUrl(String query, String fileKey, String currentGuid) +32 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.GetChartImageUrl(MemoryStream stream, String imageExt) +339 System.Web.UI.DataVisualization.Charting.Chart.Render(HtmlTextWriter writer) +420 ...
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      1. POWhy is the model null when using default routing in ASP.NET MVC?
      1. USTodd J.
    3. CO@Smashd, yes my breakpoint is hit in both cases. Nothing in CreateChart inspects the URL, it just gets data from the repository, which in turn executes a stored procedure in a database.
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      1. POWhy is the model null when using default routing in ASP.NET MVC?
      1. USTodd J.
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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