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Combine two ActiveRecord::Relation objects
...
If you want to combine using AND (intersection), use merge:
first_name_relation.merge(last_name_relation)
If you want to combine using OR (union), use or†:
first_name_relation.or(last_name_relation)
† Only in ActiveRecord 5+; for 4.2 install ...
using gitignore to ignore (but not delete) files
...f .gitignore, you can update local git repository by running following command:
git update-index --assume-unchanged <file>
In this case a file is being tracked in the origin repo. You can modify it in your local repo and git will never mark it as changed. Read more at:
http://blog.pagebak...
Nested or Inner Class in PHP
... a class is useful to only one other class, then it is logical to
relate and embed it in that class and keep the two together.
It increases encapsulation.
Consider two top-level classes, A and B, where B needs access to
members of A that would otherwise be declared private. By hiding cla...
Angularjs - ng-cloak/ng-show elements blink
... body or templates aren't compiled soon enough, use the ng-cloak directive and include the following in your CSS:
/*
Allow angular.js to be loaded in body, hiding cloaked elements until
templates compile. The !important is important given that there may be
other selectors that are more sp...
What does the “static” modifier after “import” mean?
...overuse the static
import feature, it can make your
program unreadable and unmaintainable,
polluting its namespace with all the
static members you import. Readers of
your code (including you, a few months
after you wrote it) will not know
which class a static member comes
from. Impor...
Breaking out of nested loops [duplicate]
...ops than throwing an exception? (In Perl, you can give labels to each loop and at least continue an outer loop.)
8 Answer...
Make footer stick to bottom of page correctly [duplicate]
...
The simplest solution is to use min-height on the <html> tag and position the <footer> with position:absolute;
Demo: jsfiddle and SO snippet:
html {
position: relative;
min-height: 100%;
}
body {
margin: 0 0 100px;
/* bottom = footer height */
p...
Numpy: Get random set of rows from 2D array
...
>>> A = np.random.randint(5, size=(10,3))
>>> A
array([[1, 3, 0],
[3, 2, 0],
[0, 2, 1],
[1, 1, 4],
[3, 2, 2],
[0, 1, 0],
[1, 3, 1],
[0, 4, 1],
[2, 4, 2],
[3, 3, 1]])...
What is the best way to conditionally apply a class?
...you have an array that is rendered in a ul with an li for each element and a property on the controller called selectedIndex . What would be the best way to add a class to the li with the index selectedIndex in AngularJS?
...
Using the “animated circle” in an ImageView while loading stuff
...ut this block of xml in your activity layout file:
<RelativeLayout
android:id="@+id/loadingPanel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" >
<ProgressBar
android:layout_width="wrap_content"
androi...