Does a writ of mandate need to be issued?

County of San Diego v. State of California (2008) 164 Cal.App.4th 580, 593, 79 Cal.Rptr.3d 489.) Rather, issuance of a writ of mandate lies within the discretion of the court. However, where one has a substantial right to protect or enforce, which may be accomplished by such a writ, and there is no other plain, speedy and adequate remedy, the petitioner is entitled as a matter of right to the writ. (Ibid. ) It would be an abuse of discretion to refuse it. (Ibid. )