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How does Rails keep track of which migrations have run for a database?
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
Difference between Java Enumeration and Iterator
...n Enumeration:
Iterators differ from
enumerations in two ways:
Iterators allow the caller to remove elements from the underlying
collection during the iteration with
well-defined semantics.
Method names have been improved.
The bottom line is, both Enumeration and Iterator will give successive el...
Getting “unixtime” in Java
...
The Java 32-bit int matches 32-bit platforms (and the year 2038 problem). 64-bit platforms use a larger time_t data type. Java dodged that bullet by using a long as the return for System.currentTimeMillis(). If you convert to int, ...
presentViewController:animated:YES view will not appear until user taps again
...ith presentViewController:animated:completion . What I'm making is essentially a guessing game.
8 Answers
...
How should a model be structured in MVC? [closed]
...understand MVC-like patterns in the context of PHP-based web applications. All the external links that are used in the content are there to explain terms and concepts, and not to imply my own credibility on the subject.
The first thing that I must clear up is: the model is a layer.
Second: there ...
Does .NET have a way to check if List a contains all items in List b?
...s easy:
public class ListHelper<T>
{
public static bool ContainsAllItems(List<T> a, List<T> b)
{
return !b.Except(a).Any();
}
}
This checks whether there are any elements in b which aren't in a - and then inverts the result.
Note that it would be slightly mo...
Regular expression to allow spaces between words
I want a regular expression that prevents symbols and only allows letters and numbers. The regex below works great, but it doesn't allow for spaces between words.
...
What is the difference between MOV and LEA?
...reas MOV loads the actual value at that address.
The purpose of LEA is to allow one to perform a non-trivial address calculation and store the result [for later usage]
LEA ax, [BP+SI+5] ; Compute address of value
MOV ax, [BP+SI+5] ; Load value at that address
Where there are just constants invo...
Visualizing branch topology in Git
...n on my own machine, and I find it difficult to maintain a mental model of all my branches and commits. I know I can do a git log to see the commit history from where I am, but is there a way to see the entire branch topography, something like these ASCII maps that seem to be used everywhere for e...
Cannot highlight all occurrences of a selected word in Eclipse
...C/C++ Write occurrences. But still when I select a word it won't highlight all occurrences of that specific word.
12 Answer...