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Find all records which have a count of an association greater than zero
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joins uses an inner join by default so using Project.joins(:vacancies) will in effect only return projects that have an associated vacancy.
UPDATE:
As pointed out by @mackskatz in the comment, without a group clause, the code above will return dupl...
Programmatically set height on LayoutParams as density-independent pixels
...d-coded to only support a fixed number of densities. If you want to scale by the density scaling factor, just multiply by developer.android.com/reference/android/util/… which would also be the same as doing (size * metrics.densityDpi) / DisplayMetrics.DENSITY_DEFAULT.
– hack...
Can I keep Nuget on the jQuery 1.9.x/1.x path (instead of upgrading to 2.x)?
...ve a reply.
In the interim, you can constrain the version of your package by using the following syntax in your packages.config:
<package id="jQuery" version="1.9.1" allowedVersions="[1.9.1]" />
There's more information on version constraints here:
http://docs.nuget.org/docs/reference/Ver...
Quit and restart a clean R session from within R?
... This solution works but is not reproducible when my script is run by others. Is there a command to be included in R script to restart R session? (the reason being I want all packages to be detached)
– Heisenberg
Oct 19 '14 at 20:04
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ctypes - Beginner
...the non-python part of the tutorial. Make sure ctypes can find the library by putting it in /usr/lib or another standard directory. If you do this, you don't need to specify the full path when writing the wrapper. If you choose not to do this, you must provide the full path of the library when calli...
What is the benefit of using “SET XACT_ABORT ON” in a stored procedure?
...ient application rather than within SQL Server itself (which isn't covered by the default XACT_ABORT OFF setting.)
Since a query timeout will leave the transaction open, SET XACT_ABORT ON is recommended in all stored procedures with explicit transactions (unless you have a specific reason to do oth...
How to mount a host directory in a Docker container
...me on mac os x with docker-machine and VirtualBox. One caveat I discovered by trial and error is that the host directory must be a full path and not a relative path.
– jbustamovej
Feb 9 '17 at 22:23
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Global variables in Java
...t a;
public static int b;
}
now you can access a and b from anywhere
by calling
Example.a;
Example.b;
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What goes into the “Controller” in “MVC”?
...hin. View Helpers are a perfect place to collect data ready to be consumed by your view. One should not have to dispatch the complete controller stack on to reuse some data-access logic. More detail: rmauger.co.uk/2009/03/…
– Exception e
Nov 24 '09 at 14:56
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What's the difference between IEquatable and just overriding Object.Equals()?
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I see. By chance you have any place where I can get that kind of "deeper" information about .NET? Thanks!
– devoured elysium
Apr 29 '10 at 6:03
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