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ActiveRecord.find(array_of_ids), preserving order
When you do Something.find(array_of_ids) in Rails, the order of the resulting array does not depend on the order of array_of_ids .
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postgresql: INSERT INTO … (SELECT * …)
...s Henrik wrote you can use dblink to connect remote database and fetch result. For example:
psql dbtest
CREATE TABLE tblB (id serial, time integer);
INSERT INTO tblB (time) VALUES (5000), (2000);
psql postgres
CREATE TABLE tblA (id serial, time integer);
INSERT INTO tblA
SELECT id, time
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Elegant ways to support equivalence (“equality”) in Python classes
... = Number(1)
n2 = Number(1)
n1 == n2 # False -- oops
So, Python by default uses the object identifiers for comparison operations:
id(n1) # 140400634555856
id(n2) # 140400634555920
Overriding the __eq__ function seems to solve the problem:
def __eq__(self, other):
"""Overrides the default ...
Filtering Pandas DataFrames on dates
I have a Pandas DataFrame with a 'date' column. Now I need to filter out all rows in the DataFrame that have dates outside of the next two months. Essentially, I only need to retain the rows that are within the next two months.
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What's the “big idea” behind compojure routes?
...lity to examine the URI used in the request, examine any cookies etc. and ultimately arrive at an appropriate response. Clearly it is necessary that all this work be factored into a collection of well-defined pieces; these are normally a "base" handler function and a collection of middleware functi...
Enabling ProGuard in Eclipse for Android
...new documentation on ProGuard for Android says to add a line to the default.properties file in the project home directory. However, on opening this file, I read at the top:
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How do I open a second window from the first window in WPF?
...l .xaml file and .cs file to represent your sub window.
MainWindow.xaml
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"&g...
How to visualize an XML schema? [closed]
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Go to the dist/lib folder.
Run the following command java -jar xsdvi.jar <input1.xsd> [<input2.xsd> [<input3.xsd> ...]] [style]
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What is the difference between .*? and .* regular expressions?
...*?, .+?, .{2,6}?, and even .??.
In your case, a similar pattern could be <([^>]*)> - matching anything but a greater-than sign (strictly speaking, it matches zero or more characters other than > in-between < and >).
See Quantifier Cheat Sheet.
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public friend swap member function
... writing a swap function.
We first see that containers like std::vector<> have a single-argument member function swap, such as:
struct vector
{
void swap(vector&) { /* swap members */ }
};
Naturally, then, our class should too, right? Well, not really. The standard library has al...