TSQL Computed column limitations - sql

Question

CREATE TABLE [dbo].[MembershipModule](
[Id] [uniqueidentifier] ROWGUIDCOL NOT NULL,
[ParentId] [uniqueidentifier] NULL,
[TargetId] [int] NULL,
[WebContentId] [uniqueidentifier] NULL,
[Name] [varchar](35) NOT NULL,
[NameUpper] AS (isnull(upper([Name]),'')) PERSISTED NOT NULL,
[UriPrefix] [varchar](max) NULL,
[UriText] [varchar](max) NULL,
[UriComputed] AS ??? PERSISTED,
[Description] [varchar](100) NULL,
[Created] [date] NOT NULL,
[Modified] [datetime2](7) NOT NULL,
[MenuItem] [bit] NOT NULL,
[Enabled] [bit] NOT NULL,
[Position] [smallint] NULL,
CONSTRAINT [PK_MembershipModule] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
So far the UriComputed field is computed like this:
lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))
This produces output like the following
Now, I'd want to terminate all UriComputed values with '/'. This would be easily accomplished by adding + '/' to the computed field, except for the fact that "textless" uris, would be terminated like //, which I don't want happening.
since the sql I can put into a computed field is quite limited (and I don't really know the extents of these limitations) I thought I'd ask here how to add this.
basically I want the output in the image to be
/a/login/
/a/announcements/
/a/
/
my closest attempt at doing this has been:
isnull(convert(varchar(MAX),nullif(len(coalesce([UriText],[Name])),0)),'/')
Which does kind of a mess, and adds a number if it should terminate in '/', and adds '/' when it should, what I'd need is the opposite ( that is, '/' when the length is 0, '' otherwise)
If there's an inline if or something like that I could use that would basically be it, but I don't know about that.
Thank you!

Answer 1

This worked for me:
[UriComputed] AS (CASE
WHEN RIGHT(lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')), 1) = '/' THEN
lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))
ELSE
lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')) +'/'
END) PERSISTED,
Full CREATE TABLE statement:
CREATE TABLE [dbo].[MembershipModule](
[Id] [uniqueidentifier] ROWGUIDCOL NOT NULL,
[ParentId] [uniqueidentifier] NULL,
[TargetId] [int] NULL,
[WebContentId] [uniqueidentifier] NULL,
[Name] [varchar](35) NOT NULL,
[NameUpper] AS (isnull(upper([Name]),'')) PERSISTED NOT NULL,
[UriPrefix] [varchar](max) NULL,
[UriText] [varchar](max) NULL,
[UriComputed] AS (CASE
WHEN RIGHT(lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')), 1) = '/' THEN
lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))
ELSE
lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')) +'/'
END) PERSISTED,
[Description] [varchar](100) NULL,
[Created] [date] NOT NULL,
[Modified] [datetime2](7) NOT NULL,
[MenuItem] [bit] NOT NULL,
[Enabled] [bit] NOT NULL,
[Position] [smallint] NULL)