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Scopes
Scope provides elegant way to write commonly used query fragments and improve readability of your code. Scope returns a new collection Collection or taint the current Collection.
Let's get an example:
class User
include Clear::Model
primary_key
column role : String
column role_level : Int32
column email : String
column active : Bool
scope :with_privileges do |level|
where{ role.in?(%w(superadmin admin)) | (role_level > level) }
end
scope(:active){ where(active: true) }
end
# Later one:
User.with_privileges(3).each do |x|
puts "Admin #{x.id} - #{x.email}"
end
Scope can be easily chained and you can pass argument to them too:
User.with_admin_privileges(4).active
Scope live both in
Model::Collection and Model code space, meaning you may ignore Model.query to start a new Collection but instead go straight to Model.scope.Last modified 4yr ago