使用rails has_scope gem来确定数组中最后x个项目的范围

Question

I'm using the has_scope gem.

I want to scope the last x number of items in an array of Articles in my database

something like this:

scope :last_few_items, -> num { Article.last(num) }

so in my querystring I could say www.bla.com?last_few_items=2 to return the last 2 items of an array

but all the examples I see for has_scope use this syntax:

scope :scope_name, -> vartopass { where(attribute_val: vartopass)}

wher 'attribute_val' are all attributes from my database... so I'm not really sure how to get what I want... aside from making a new route and a new controller that defines @articles = Article.last(2) or something like that

Answer 1

This is extracted from your question:

wher 'attribute_val' are all attributes from my database... so I'm not really sure how to get what I want... aside from making a new route and a new controller that defines @articles = Article.last(2) or something like that

Did you tried it? This is actually the right way to do it, Rails natively implement last(n)