How do i restrict access to the Admin Page

Please i am already done creating a CakePhp Application but the
problem i am having presently is how to restrict users access to the
admin area. I am using the users table both for my site users and also
for the administrator as well. I have already created a field called
role in the Users table and i have given the administrator the role of
admin.
Please how do i allow access to the administrator area to only the
users who have an admin role.

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