ruby on rails - Law of Demeter in `includes` and `group` queries -

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how can apply law of demeter on code?

i know how creating separate methods, scope.... i'm not sure how queries this.

  pages = seo::page.active     .path_with(category)     .includes(seo_area: :suburb)     .group('suburbs.state')

scope :path_with, -> category { where('path ?', "/#{category}/%") }

you can create class-methods or new scopes encapsulate logic in seo::page class.

def self.grouped(category)   active     .path_with(category)     .includes(seo_area: :suburb)     .group('suburbs.state') end  pages = seo::page.grouped(category)

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