Due to their rich algebraic structure, cyclic codes have a great deal of
significance amongst linear codes. Duadic codes are the generalization of the
quadratic residue codes, a special case of cyclic codes. The $m$-adic residue
codes are the generalization of the duadic codes. The aim of this paper is to
study the structure of the $m$-adic residue codes over the quotient ring
$\mathbb{F}_{q}[v]/(v^s-v).$ We determine the idempotent generators of the
$m$-adic residue codes over $\mathbb{F}_{q}[v]/(v^s-v)$. We obtain some
parameters of optimal $m$-adic residue codes over $\mathbb{F}_{q}[v]/(v^s-v),$
with respect to Griesmer bound for rings.