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Rails 3 check if attribute changed
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Check out ActiveModel::Dirty (available on all models by default). The documentation is really good, but it lets you do things such as:
@user.street1_changed? # => true/false
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Add a space (“ ”) after an element using :after
...` \0020` as a separate answer because some fonts, eg Font Awesome will not allow \00A0 to display a space, and if you want a space between elements rather than before or after you can't use padding
– Mousey
Oct 15 '15 at 23:02
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What's the difference between design patterns and architectural patterns?
...owledge.
Patterns are distilled commonality that you find in programs. It allows us to deconstruct a large complex structure and build using simple parts. It provides a general solution for a class of problems.
A large complex software goes through a series of deconstruction at different levels. ...
What are the differences between a HashMap and a Hashtable in Java?
...shMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd wa...
Difference between Visual Basic 6.0 and VBA
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For nearly all programming purposes, VBA and VB 6.0 are the same thing.
VBA cannot compile your program into an executable binary. You'll always need the host (a Word file and MS Word, for example) to contain and execute your project. ...
How to check file MIME type with javascript before upload?
...emo at the bottom.
Check that your browser supports both File and Blob. All major ones should.
if (window.FileReader && window.Blob) {
// All the File APIs are supported.
} else {
// File and Blob are not supported
}
Step 1:
You can retrieve the File information from an <in...
RESTfully design /login or /register resources?
...ounter. [...]
[... H]andling [of GET requests] by the server is not technically limited in any way. Therefore, careless or deliberate programming can cause non-trivial changes on the server. This is discouraged, because it can cause problems for Web caching, search engines and other automated agents...
What jsf component can render a div tag?
...if you want to wrap any of your JSF code with the div tag.
Alternatively, all the major UI Frameworks have a div component tag, or you could write your own.
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FFmpeg: How to split video efficiently?
I wish to split a large avi video into two smaller consecutive videos. I am using ffmpeg.
9 Answers
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What is the difference between self-types and trait subclasses?
...is extended, then you're required to mix-in an A.
When a concrete class finally extends/mixes-in these traits, some class/trait must implement A.
Consider the following examples:
scala> trait User { def name: String }
defined trait User
scala> trait Tweeter {
| user: User =>
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