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Facebook access token server-side validation for iPhone app
...oken you want to verify, and ACCESS_TOKEN is your app's token that you got from step 1.
The debug endpoint basically dumps all information about a token, so it'll respond with something like this:
{
data: {
app_id: YOUR_APP_ID,
is_valid: true,
metadata: {
ss...
Adding :default => true to boolean in existing Rails column
...m not sure when this was written, but currently to add or remove a default from a column in a migration, you can use the following:
change_column_null :products, :name, false
Rails 5:
change_column_default :products, :approved, from: true, to: false
http://edgeguides.rubyonrails.org/active_rec...
How to get the seconds since epoch from the time + date output of gmtime()?
...datetime.datetime.utcnow()- ep).total_seconds()
This should be different from int(time.time()), but it is safe to use something like x % (60*60*24)
datetime — Basic date and time types:
Unlike the time module, the datetime module does not support leap seconds.
...
Programmer Puzzle: Encoding a chess board state throughout a game
...ng:
e4 e5
Nf3 Nc6
…
which translates to:
White moves king’s pawn from e2 to e4 (it is the only piece that can get to e4 hence “e4”);
Black moves the king’s pawn from e7 to e5;
White moves the knight (N) to f3;
Black moves the knight to c6.
…
The board looks like this:
An impor...
“Code too large” compilation error in Java
...a bit like madness. Can you not initialize the array by reading the values from a text file, or some other data source?
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Install gitk on Mac
...blem and solved it as follows:
Download the official git package for Mac from http://git-scm.com/download/mac
Install the package. This places all the binaries in /usr/local/git/bin.
Optionally run the included script to make gitk accessible outside of terminals
Either add /usr/local/git/bin to yo...
What is the meaning of prepended double colon “::”?
...
This ensures that resolution occurs from the global namespace, instead of starting at the namespace you're currently in. For instance, if you had two different classes called Configuration as such:
class Configuration; // class 1, in global namespace
namespace...
C++ Singleton design pattern
...ngleton design pattern for C++. It has looked like this (I have adopted it from the real life example):
22 Answers
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Why does datetime.datetime.utcnow() not contain timezone information?
..., you could pass tzinfo to datetime.now() directly:
#!/usr/bin/env python
from datetime import datetime
import pytz # $ pip install pytz
print(datetime.now(pytz.timezone("America/New_York")))
It works for any timezone including those that observe daylight saving time (DST) i.e., it works for tim...
Is it possible to make relative link to image in a markdown file in a gist?
...
According to http://blog.rodneyrehm.de/archives/35-Including-Data-From-Github.html, the problem in using
https://gist.github.com/user/605560c2961cb3025038/raw/b75d2...6e8/img.png
is that the b75d2...6e8 part varies per file (a quick experimentation confirms it is the git blob id). How...