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Django database query: How to get object by id?
...a primary key. If the author did specify a primary key field that isn't named id, then there will not be an id field.
– Craig Trader
Nov 29 '10 at 4:18
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Why are there two build.gradle files in an Android Studio project?
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+1 Thank you, will accept your answer momentarily. Is the build.gradle file's presence mandatory to trigger a build? Also, does the top level build file call sub-level files? (Although there is no evidence of that.)
– Sabuncu
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What is mattr_accessor in a Rails module?
I couldn't really find this in Rails documentation but it seems like 'mattr_accessor' is the Module corollary for 'attr_accessor' (getter & setter) in a normal Ruby class .
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How do I prevent 'git diff' from using a pager?
... a single screen.
Usage:
git --no-pager diff
Other options from the comments include:
# Set an evaporating environment variable to use 'cat' for your pager
GIT_PAGER=cat git diff
# Tells 'less' not to paginate if less than a page
export LESS="-F -X $LESS"
# ...then Git as usual
git diff
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What is Double Brace initialization in Java?
...unding outer class. Whilst not normally a problem, it can cause grief in some circumstances e.g. when serialising or garbage collecting, and it's worth being aware of this.
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CocoaPods and GitHub forks
This is my first time forking a GitHub project, and I'm not too competent with CocoaPods either, so please bear with me.
2 ...
How to count the number of true elements in a NumPy bool array
... a NumPy array 'boolarr' of boolean type. I want to count the number of elements whose values are True . Is there a NumPy or Python routine dedicated for this task? Or, do I need to iterate over the elements in my script?
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Loop through an array of strings in Bash?
...ou can use it like this:
## declare an array variable
declare -a arr=("element1" "element2" "element3")
## now loop through the above array
for i in "${arr[@]}"
do
echo "$i"
# or do whatever with individual element of the array
done
# You can access them using echo "${arr[0]}", "${arr[1]}" ...
Rename master branch for both local and remote Git repositories
...te master-old # create master-old on remote
git checkout -b master some-ref # create a new local master
git push remote master # create master on remote
However this has a lot of caveats. First, no existing checkouts will know about the rename - git does not attempt to track branch ...
How do you get AngularJS to bind to the title attribute of an A tag?
The intent is to have a product name appear in the tooltip of a thumbnail.
Browsers do not create a tooltip from "ng-title" or "ng-attr-title."
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