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How does Rails keep track of which migrations have run for a database?
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Rails creates a table in your database called schema_migrations to keep track of which migrations have run.
The table contains a single column, version. When Rails runs a migration, it takes the leading digits in the migration's file name and inserts a row for th...
jQuery slide left and show
I extended the jQuery effects called slideRightShow() and slideLeftHide() with a couple functions that work similarly to slideUp() and slideDown() as seen below. However, I would also like to implement slideLeftShow() and slideRightHide() .
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What is RPC framework and Apache Thrift?
...n RPC framework in general is a set of tools that enable the programmer to call a piece of code in a remote process, be it on a different machine or just another process on the same machine.
In the particular case of Apache Thrift, we talk about a framework designed to be efficient, and available a...
User recognition without cookies or local storage
...be thinking:
Why so much Math and Logic for a seemingly simple task?
Basically, because it is not a simple task. What you are trying to achieve is, in fact, Pure Probability. For example, given the following known users:
User1 = A + B + C + D + G + K
User2 = C + D + I + J + K + F
When you recei...
Why can't yield return appear inside a try block with a catch?
... aren't meant to be re-entrant. If you split them up then it's possible to call MoveNext() after an exception and continue the try block with a possibly invalid state.
– Mark Cidade
Dec 9 '08 at 5:44
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What is the difference between Raising Exceptions vs Throwing Exceptions in Ruby?
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@wired00: It has been called "raising" an exception ever since the very first experiments with structured error handling in the 1960s, it is called "raising" an exception in the seminal articles that invented the modern form of exception handling,...
Is quitting an application frowned upon?
...ity.
Our users log in and can't be doing
that every time they get a phone call
and Android decides to kill the app.
There are many iPhone and Android applications that deal with this. Usually, it is because they hold onto login credentials, rather than forcing users to log in every time manually.
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Getting the Value of a UITextField as keystrokes are entered?
...you register for it. Just register for that notification and in the method called by the notification, change the label's text.
To add to this, the object passed to your notification handler will have the text of the UITextField.
Hope that helps.
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Oracle find a constraint
I have a constraint called users.SYS_C00381400 . How do I find what that constraint is? Is there a way to query all constraints?
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Naming cookies - best practices [closed]
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I use whatever style the coding standards for the project call for.
Generally I prefer camelCase for naming schemes, but whichever one pays the bills is the one I'll go with.
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