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ActiveRecord, has_many :through, and Polymorphic Associations
...m is you're misusing the :source option. :source should points to the polymorphic belongs_to relationship. Then all you need to do is specify :source_type for the relationship you're trying to define.
This fix to the Widget model should allow you do exactly what you're looking for.
class Widget &l...
Batch file: Find if substring is in string (not in a file)
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Yes, you can use substitutions and check against the original string:
if not x%str1:bcd=%==x%str1% echo It contains bcd
The %str1:bcd=% bit will replace a bcd in str1 with an empty string, making it different from the original.
If the original didn't contain a bcd string in...
How can I detect whether an iframe is loaded?
...the ajax function. The recommended replacement is simply on("load"). (Unfortunately, the docs don't quite make clear that that's all you need to do.)
– Teepeemm
Oct 5 '14 at 0:25
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Calculating the difference between two Java date instances
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The JDK Date API is horribly broken unfortunately. I recommend using Joda Time library.
Joda Time has a concept of time Interval:
Interval interval = new Interval(oldTime, new Instant());
EDIT: By the way, Joda has two concepts: Interval for...
How to remove all listeners in an element? [duplicate]
...of the node in question, so if you want to preserve that you'll have to resort to explicitly removing listeners one at a time.
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How do I get the name of a Ruby class?
How can I get the class name from an ActiveRecord object?
5 Answers
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How to put a unicode character in XAML?
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Since XAML is an XML file format you could try the XML character escape. So instead of writing &\u2014, you could write — instead.
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How to convert boost path type to string?
... Are there guarantues that string returns utf8 encoded path on all platforms?
– Sergey Shambir
May 12 '17 at 8:36
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Removing list of vms in vagrant cache
I'm not looking for this answer, because my question is different.
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How to access array elements in a Django template?
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Remember that the dot notation in a Django template is used for four different notations in Python. In a template, foo.bar can mean any of:
foo[bar] # dictionary lookup
foo.bar # attribute lookup
foo.bar() # method call
foo[bar] # list-index lookup
It tries ...