def prep_signup_view(tenant=nil, user=nil, coupon={coupon:''})
    @user   = klass_option_obj( User, user )
    @tenant = klass_option_obj( Tenant, tenant )
    @coupon = coupon #  if ::Milia.use_coupon
 end
def prep_signup_view(tenant=nil, user=nil, coupon={coupon:''})
    @user   = klass_option_obj( User, user )
    @tenant = klass_option_obj( Tenant, tenant )
    @coupon = coupon #  if ::Milia.use_coupon
 end
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 prep_signup_view -- prepares for the signup view
 args:
   tenant: either existing tenant obj or params for tenant
   user:   either existing user obj or params for user
 My signup form has fields for user's email,
 organization's name (tenant model), coupon code,
 ------------------------------------------------------------------------------