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Show pending migrations in rails
...5) or rails db:migrate:status (Rails 5) will accomplish this. See this commit.
up means the migration has been run. down means the migration has not been run.
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How to “grep” for a filename instead of the contents of a file?
grep is used to search within a file to see if any line matches a given regular expression. However, I have this situation - I want to write a regular expression that will match the filename itself (and not the contents of the file). I will run this from the system's root directory, to find all thos...
How do I catch a PHP fatal (`E_ERROR`) error?
I can use set_error_handler() to catch most PHP errors, but it doesn't work for fatal ( E_ERROR ) errors, such as calling a function that doesn't exist. Is there another way to catch these errors?
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Should I URL-encode POST data?
I'm POSTing data to an external API (using PHP, if it's relevant).
4 Answers
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Reading a simple text file
... simple text file in my sample Android Application. I am using the below written code for reading the simple text file.
7 A...
Web Reference vs. Service Reference
I just hit a huge brick wall with Paypal. I had created a regular C# project to create some wrapper classes using their WSDL.
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Converting RGB to grayscale/intensity
When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
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jQuery select2 get value of select tag?
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$("#first").val(); //it return 1,2,3 OR $("#first").select2('val'); // it return first,second,three
– Renish Khunt
Nov 11 '13 at 14:23
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Find row where values for column is maximal in a pandas DataFrame
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Use the pandas idxmax function. It's straightforward:
>>> import pandas
>>> import numpy as np
>>> df = pandas.DataFrame(np.random.randn(5,3),columns=['A','B','C'])
>>> df
A B C
0 1.232853 -1.9...
File extension for PowerShell 3
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Update for 2014: This is still relevant now with Powershell 4. I think the 1 was really just to distinguish it from .ps (PostScript) files, but it made for a lot of confusion!
– evilspoons
Aug 20 '14 at 22:04
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