metamaps--metamaps/app/policies/message_policy.rb

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class MessagePolicy < ApplicationPolicy
class Scope < Scope
def resolve
visible = %w(public commons)
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permission = 'maps.permission IN (?)'
if user
scope.joins(:maps).where(permission + ' OR maps.user_id = ?', visible, user.id)
else
scope.where(permission, visible)
end
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end
end
delegate :show?, to: :resource_policy
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def create?
record.resource.present? && resource_policy.update?
end
def update?
record.user == user
end
def destroy?
record.user == user || admin_override
end
# Helpers
def resource_policy
@resource_policy ||= Pundit.policy(user, record.resource)
end
end