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The differences between .build, .create, and .create! and when should they be used?

So I've been seeing people using .build , .create , and .create! within their controllers more and more lately. What's the difference from just using .new and passing the param'd object and then .save ? Are there pros and cons? Does using these other methods offer benefits? ...
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NSLog/printf specifier for NSInteger?

A NSInteger is 32 bits on 32-bit platforms, and 64 bits on 64-bit platforms. Is there a NSLog specifier that always matches the size of NSInteger ? ...
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How to “pull” from a local branch into another one?

This sounds so simple, but I just can't figure it out. I made an experimental branch a while ago, and now I'd like to pull in all the changes that happened on master since I made it. This is all local. I want to pull from local master into local my_branch, but I can't do it. This doesn't seem to wor...
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UITableView with fixed section headers

Greets, I'm reading that the default behaviour of UITableView is to pin section header rows to the top of the table as you scroll through the sections until the next section pushes the previos section row out of view. ...
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How do I remove all HTML tags from a string without knowing which tags are in it?

Is there any easy way to remove all HTML tags or ANYTHING HTML related from a string? 3 Answers ...
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Merge git repo into branch of another repo

Given repo Foo and repo Bar. I want to merge Bar with Foo, but only into a separate branch, called baz . 3 Answers ...
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Twitter Bootstrap: div in container with 100% height

Using twitter bootstrap (2), I have a simple page with a nav bar, and inside the container I want to add a div with 100% height (to the bottom of the screen). My css-fu is rusty, and I can't work this out. ...
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Where in a virtualenv does the custom code go?

What sort of directory structure should one follow when using virtualenv ? For instance, if I were building a WSGI application and created a virtualenv called foobar I would start with a directory structure like: ...
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In R, how to get an object's name after it is sent to a function?

I am looking for the reverse of get() . 3 Answers 3 ...
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AngularJS validation with no enclosing

Is it possible in Angular to validate a single, isolated <input> in a similar way the forms are validated? I'm thinking about something like this: ...