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Where to define custom error types in Ruby and/or Rails?
Is there a best practice for defining custom error types in a Ruby library (gem) or Ruby on Rails application? Specifically:
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See what process is using a file in Mac OS X
I would like to be able to track a file and see which process is touching that file. Is that possible? I know that I can see the list of open processes in activity monitor but I think it's happening to quickly for me to see it. The reason for this is I'm using a framework and I think the system v...
Convert data.frame column format from character to factor
I would like to change the format (class) of some columns of my data.frame object ( mydf ) from charactor to factor .
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Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML
Wondering if there are other codes available to use in an HTML newsletter.
5 Answers
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Java Persistence / JPA: @Column vs @Basic
What is the difference between @Column and @Basic annotations in JPA? Can they be used together? Should they be used together? Or does one of them suffice?
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How to un-escape a backslash-escaped string?
Suppose I have a string which is a backslash-escaped version of another string. Is there an easy way, in Python, to unescape the string? I could, for example, do:
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_=> what does this underscore mean in Lambda expressions?
What does an lambda expression like _=> expr mean?
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Git - working on wrong branch - how to copy changes to existing topic branch
...king on a project, but unfortunately, I forgot to switch to my branch, and as such have been working on master
4 Answers
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How to check for the type of a template parameter?
Suppose I have a template function and two classes
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How do I delete a fixed number of rows with sorting in PostgreSQL?
I'm trying to port some old MySQL queries to PostgreSQL, but I'm having trouble with this one:
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