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How do I automatically sort a has_many relationship in Rails?
...ill change wildly depending on how you're fetching data in the first place and which Ruby you're using to run your app.
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Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad?
...t need a GIL (which is why it can perfectly be implemented on JVM [Jython] and .NET [IronPython], and those implementations multithread freely). CPython (the popular implementation) has always used a GIL for ease of coding (esp. the coding of the garbage collection mechanisms) and of integration of ...
Can you list the keyword arguments a function receives?
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A little nicer than inspecting the code object directly and working out the variables is to use the inspect module.
>>> import inspect
>>> def func(a,b,c=42, *args, **kwargs): pass
>>> inspect.getargspec(func)
(['a', 'b', 'c'], 'args', 'kwargs', (42,))
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Regular expression matching a multiline block of text
...e.MULTILINE)
I think your biggest problem is that you're expecting the ^ and $ anchors to match linefeeds, but they don't. In multiline mode, ^ matches the position immediately following a newline and $ matches the position immediately preceding a newline.
Be aware, too, that a newline can consi...
Rails where condition using NOT NIL
...ils 3:
Foo.includes(:bar).where("bars.id IS NOT NULL")
ActiveRecord 4.0 and above adds where.not so you can do this:
Foo.includes(:bar).where.not('bars.id' => nil)
Foo.includes(:bar).where.not(bars: { id: nil })
When working with scopes between tables, I prefer to leverage merge so that I c...
How do I convert a Ruby class name to a underscore-delimited symbol?
..., FooBar , into a symbol, :foo_bar ? e.g. something like this, but that handles camel case properly?
4 Answers
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When to use a key/value store such as Redis instead/along side of a SQL database?
...real-time data, such as session store, state database, statistics, caching and its advanced data structures offers versatility to many other scenarios.
Redis, however, isn't NoSQL replacement for classic relational databases since it doesn't support many standard features of RDBMS world such as que...
Heroku error: “Permission denied (public key)”
I keep getting this error. I am using Mac. I generated a key and added it to heroku using
6 Answers
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How to read the Stock CPU Usage data
On Ice Cream Sandwich, an option in the Developer Options is "Show CPU Usage", which adds an overlay on the screen (see screenshot below).
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Efficiently updating database using SQLAlchemy ORM
I'm starting a new application and looking at using an ORM -- in particular, SQLAlchemy.
6 Answers
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