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A migration to add unique constraint to a combination of columns
...y want to add a constraint without an index. This will depend on what database you're using. Below is sample migration code for Postgres. (tracking_number, carrier) is a list of the columns you want to use for the constraint.
class AddUniqeConstraintToShipments < ActiveRecord::Migration
def...
How to handle AccessViolationException
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How to revert a Git Submodule pointer to the commit stored in the containing repository?
...ning
repository. This will make the submodules HEAD be detached unless
--rebase or --merge is specified or the key submodule.$name.update
is set to rebase or merge.
Run this and all should be well:
git submodule update --init
You can add the --recursive flag as well to recurse through all submodul...
What is the meaning of addToBackStack with null parameter?
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C/C++ macro string concatenation
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Generic Repository With EF 4.1 what is the point
...c interface and exposes IDbSet rather than DbSet's. Since I am using a Database First approach, because our database already exists, I simply modified the T4 templates used to generate my derived DbContext to generate it to return IDbSet interfaces, as well as derive from my generic interface. That ...
How can I save an image to the camera roll?
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What does “Mass Assignment” mean in Laravel?
...rt to it via the model, but it will never really get inserted into the database.
This is for security, and protection on your table when using the model. Mass assignment seems to be just a notice or warning that you didn't tell the model which are fillable and guarded and makes it vulnerable to so...
Is there a way to detect if a browser window is not currently active?
...accuracy (e.g. Alt+Tab to switch to another application).
Using focus/blur based methods gives you a lot of false positive. For example, if the user displays a smaller window on top of the browser window, the browser window will lose the focus (onblur raised) but the user is still able to see it (so...
android splash screen sizes for ldpi,mdpi, hdpi, xhdpi displays ? - eg : 1024X768 pixels for ldpi
... have even commented. He asked for a size list, and you simply give a list based on something else with no explanation. You should edit it in, whether or not you link to the docs.
– Geobits
Oct 5 '13 at 5:22
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