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What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...nning different versions on different machines could lead to broken tests, etc.) You shouldn't ever have to directly edit the lock file.
Check out Bundler's Purpose and Rationale, specifically the Checking Your Code into Version Control section.
...
Rails migration for has_and_belongs_to_many join table
...r_id:integer
(note the table name lists both join tables in alphabetical order)
and then for rails 3 and below only, you need to edit your generated migration so an id field is not created:
create_table :students_teachers, :id => false do |t|
...
What's so bad about Template Haskell?
... Don't forget that the use of Template Haskell suddently means the order of declarations matters! TH just is not integrated as tightly as one might hope given the smooth polish of Haskell (be it 1.4, '98, 2010 or even Glasgow).
– Thomas M. DuBuisson
Ju...
Pandas - Get first row value of a given column
.... See below for an explanation of why. Because a subtle difference in
the order of indexing makes a big difference in behavior, it is better to use single indexing assignment:
df.iloc[0, df.columns.get_loc('Btime')] = x
df.iloc[0, df.columns.get_loc('Btime')] = x (recommended):
The recommende...
System.Data.SQLite Close() not releasing database file
... for me.
I had to add GC.WaitForPendingFinalizers() after GC.Collect() in order to proceed with the file deletion.
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Matplotlib: draw grid lines behind other graph elements
...rding to this - http://matplotlib.1069221.n5.nabble.com/axis-elements-and-zorder-td5346.html - you can use Axis.set_axisbelow(True)
(I am currently installing matplotlib for the first time, so have no idea if that's correct - I just found it by googling "matplotlib z order grid" - "z order" is typi...
MySQL/SQL: Group by date only on a Datetime column
...ed date_format
SELECT date
FROM blog
GROUP BY DATE_FORMAT(date, "%m-%y")
ORDER BY YEAR(date) DESC, MONTH(date) DESC
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How to detect a Christmas Tree? [closed]
... is either less than 0.2 on a 0.0-1.0 scale (corresponding roughly to the border between yellow and green) or greater than 0.95 (corresponding to the border between purple and red) and additionally I require bright, saturated colors: saturation and value must both be above 0.7. The results of the t...
MIN and MAX in C
...tion provided by dreamlax.
On Debian:
$ uname -sr
Linux 2.6.11
$ cat /etc/debian_version
5.0.2
$ egrep 'MIN\(|MAX\(' /usr/include/sys/param.h
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
$ head -n 2 /usr/include/sys/param.h | grep GNU
This file is part of th...
Mismatched anonymous define() module
...s with anonymous modules is to overwrite the requirejs.onError function in order to prevent the default error exception thrown by requirejs which stops succesive modules or code to be executed.
– xtrm
May 22 '17 at 16:42
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