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Why should you use an ORM? [closed]
...sily formed in declarative constraints. E.g. "customer gets 10% off entire order the first time they buy more than three pairs of slacks from the same brand." How would you put that business rule into the database (keep in mind an answer involving stored procedures is clunky).
–...
How to find out which fonts are referenced and which are embedded in a PDF document
We have a little problem with fonts in PDF documents. In order to put the finger on the problem I'd like to inspect, which fonts are actually embedded in the pdf document and which are only referenced. Is there an easy (and cheap as in free) way to do that?
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Best practices to handle routes for STI subclasses in rails
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I had to set url explicitly in order for it to both render the from and saves properly. <%= form_for @child, :as => :child, url: @child.becomes(Parent)
– lulalala
May 28 '12 at 6:55
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Rails “validates_uniqueness_of” Case Sensitivity
...hreaded server. That's because you might get this sequence of events (the order is important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the n...
How do I change selected value of select2 dropdown with JqGrid?
...for then set the selectbox value.
Notice from the docs
Notice that in order to use this method you must define the
initSelection function in the options so Select2 knows how to
transform the id of the object you pass in val() to the full object it
needs to render selection. If you are att...
What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...xception in your code, this code will not catch it:
begin
rescue
end
In order to catch the Exception you will have to do this:
begin
rescue Exception
end
This means that in a sense, an Exception is a "worse" error than a RuntimeError, because you have to do more work to recover from it.
So wh...
Execute SQLite script
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In order to execute simple queries and return to my shell script, I think this works well:
$ sqlite3 example.db 'SELECT * FROM some_table;'
share
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Why does Python code use len() function instead of a length method?
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len, str, etc. can be used with higher-order functions like map, reduce, and filter without the need to define a function or lambda just to call a method. Not everything revolves around OOP, even in Python.
– Evicatos
Nov 7 '...
How to succinctly write a formula with many variables from a data frame?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How to check if an activity is the last one in the activity stack for an application?
...urrently running, with the most recent being first and older ones after in order'.
– sandrstar
Jan 29 '15 at 6:34
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