I am a beginner of Rails. I want to ask you about Default Scope. Why does default_scope use 'lambda'? Please take a look at the class below.
Class Category < ActiveRecord::Base
default_scope labmda { order('categories.name') }
end
Why not a typical block used instead of lambda?
To summarize my questions,
lambdas are basically a way to save a block or an anonymous function (like you do in javascript all the time). If you don't know what a block is...
[1,3,5,6].map { |n| n * 2 }
The stuff in the braces (or between the do and end statement} is a block.
So instead of rewriting the block a bunch of times, you could save it like so:
my_lambda = lambda { |n| n * 2 }
And you can call it like so:
[1,3,5,6].map(&my_lambda)
Like Sergio said, you don't really need to lambda there. But I suppose you could save the block somewhere else and then use it with default_scope for it and several other classes.
