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How to log something in Rails in an independent log file?
...ect like the usual Rails logger:
class User < ActiveRecord::Base
def my_logger
@@my_logger ||= Logger.new("#{Rails.root}/log/my.log")
end
def before_save
my_logger.info("Creating user with name #{self.name}")
end
end
Here I used a class attribute to memoize the logger. This wa...
NoClassDefFoundError - Eclipse and Android
...
I had this problem after updating ADT.
I was storing all of my JAR files in a folder called "lib" and adding the jars to the build path the normal Eclipse way. This worked fine until my update.
After my update, I was getting the NoClassDefFoundError for a class that I could clearly ...
How do I read configuration settings from Symfony2 config.yml?
I have added a setting to my config.yml file as such:
6 Answers
6
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Specifying and saving a figure with exact size in pixels
...el image just for an example. Here's how to show an 800x800 pixel image in my monitor (my_dpi=96):
plt.figure(figsize=(800/my_dpi, 800/my_dpi), dpi=my_dpi)
So you basically just divide the dimensions in inches by your DPI.
If you want to save a figure of a specific size, then it is a different ...
Changing every value in a hash in Ruby
...string objects):
# Two ways to achieve the same result (any Ruby version)
my_hash.each{ |_,str| str.gsub! /^|$/, '%' }
my_hash.each{ |_,str| str.replace "%#{str}%" }
If you want the hash to change in place, but you don't want to affect the strings (you want it to get new strings):
# Two ways to ...
adb not finding my device / phone (MacOS X)
...list in adb . Lots of other phones and devices work fine for me so I know my setup is good.
34 Answers
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Selecting/excluding sets of columns in pandas [duplicate]
... is there a way of just selecting the n'th column? ie: df1 = my_df[[n]] where n is the last column of n number of columns, I'm trying negative indexing [[-1]]<- it isn't working :( help!~
– 3kstc
Mar 8 '18 at 3:26
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MySQL error 2006: mysql server has gone away
I'm running a server at my office to process some files and report the results to a remote MySQL server.
28 Answers
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Setting DEBUG = False causes 500 Error
Once I change the DEBUG = False , my site will generate 500 (using wsgi & manage.py runserver), and there is no error info in Apache error log and it will run normally when I change debug to True .
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setting an environment variable in virtualenv
...vironment variables to get its configuration, but I use virtualenv to test my app locally first.
10 Answers
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