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module FinderMethods
def find_by!(*args)
raise_not_found_unless_authorized execute.find_by!(*args)
end
def find_by(*args)
if_authorized execute.find_by(*args)
end
def find(*args)
raise_not_found_unless_authorized model.find(*args)
end
private
def raise_not_found_unless_authorized(result)
result = if_authorized(result)
raise ActiveRecord::RecordNotFound.new("Couldn't find #{model}") unless result
result
end
def if_authorized(result)
# Return the result if the finder does not perform authorization checks.
# this is currently the case in the `MilestoneFinder`
return result unless respond_to?(:current_user)
if can_read_object?(result)
result
else
nil
end
end
def can_read_object?(object)
# When there's no policy, we'll allow the read, this is for example the case
# for Todos
return true unless DeclarativePolicy.has_policy?(object)
model_name = object&.model_name || model.model_name
Ability.allowed?(current_user, :"read_#{model_name.singular}", object)
end
# This fetches the model from the `ActiveRecord::Relation` but does not
# actually execute the query.
def model
execute.model
end
end
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