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How do RVM and rbenv actually work?
... practical difference between RVM and rbenv is when the version of Ruby is selected.
rbenv:
rbenv adds a shim to the start of your path, a command with the same name as Ruby. When you type ruby at a command line the shim is run instead (because it is also called "ruby" and comes first in the path)...
How to pull a random record using Django's ORM?
...on't know about other databases).
order_by('?')[:N] will be translated to SELECT ... FROM ... WHERE ... ORDER BY RAND() LIMIT N query.
It means that for every row in table the RAND() function will be executed, then the whole table will be sorted according to value of this function and then first N...
iTerm2 keyboard shortcut - split pane navigation
...erences -> Profiles/<Your Profile>/Keys). There you have actions "Select Split Pane Above", "Select Split Pane Below", "Above" "Down".
– Sundar
Aug 11 '18 at 19:07
ad...
What does the question mark operator mean in Ruby?
...ever there are several other uses of the ? in Ruby (is a ternary operator, converting a character to its ASCII integer, usage in test, in RegEx'es, etc.) many of which are covered in the other answers here.
– Karl Wilbur
Sep 11 '15 at 20:36
...
Case insensitive Query with Spring CrudRepository
With Spring CrudRepository Query; I want to select "DeviceType" entities with it's "name" property. But following query select the entitles on case sensitive manner. How I make it case insensitive way. Thanks.
...
How to connect to LocalDB in Visual Studio Server Explorer?
...11.0
Copy the Instance pipe name that starts with np:\...
In Visual Studio select TOOLS > Connect to Database...
For Server Name enter (localdb)\v11.0. If it didn't work, use the Instance pipe name that you copied earlier. You can also use this to connect with SQL Management Studio.
Select the da...
jQuery.inArray(), how to use it right?
... bit fancy you can use the bitwise not (~) and logical not(!) operators to convert the result of the inArray function to a boolean value.
if(!!~jQuery.inArray("test", myarray)) {
console.log("is in array");
} else {
console.log("is NOT in array");
}
...
Picking a random element from a set
... the buckets that make up the hashset, which allows us to more efficiently select a random elements. If random elements are necessary in Java, it might be worthwhile to define a custom hash set that allows the user to look under the hood. See [boost's docs][1] for a little more in this. [1] boos...
Is there a way to get a collection of all the Models in your Rails app?
....
EDIT: Just for fun, I found a way to list all classes
Module.constants.select { |c| (eval c).is_a? Class }
EDIT: Finally succeeded in listing all models without looking at directories
Module.constants.select do |constant_name|
constant = eval constant_name
if not constant.nil? and constan...
how do I use UIScrollView in Interface Builder?
...tion to configure the UIScrollView's contentSize from Interface Builder:
Select the UIScrollView in the Storyboard scene
Go to the Identity inspector, create a new User Defined Runtime Attribute (click the + button)
Change the attribute Key Path to contentSize
Change the attribute Type to Size
Now...