Incorporate doc lib v4 ordering

src/MyWebLog.Data/Postgres/PostgresPageData.fs

@@ -33,6 +33,10 @@ type PostgresPageData(log: ILogger) =
         log.LogTrace "Page.pageExists"
         Document.existsByWebLog Table.Page pageId webLogId
     
+    /// The query to get all pages ordered by title
+    let sortedPages =
+        selectWithCriteria Table.Page + Query.orderBy [ Field.Named $"i:{nameof Page.Empty.Title}" ] PostgreSQL
+        
     // IMPLEMENTATION FUNCTIONS
     
     /// Add a page
@@ -47,7 +51,7 @@ type PostgresPageData(log: ILogger) =
     let all webLogId =
         log.LogTrace "Page.all"
         Custom.list
-            $"{selectWithCriteria Table.Page} ORDER BY LOWER(data->>'{nameof Page.Empty.Title}')"
+            sortedPages
             [ webLogContains webLogId ]
             (fun row -> { fromData<Page> row with Text = ""; Metadata = []; PriorPermalinks = [] }) 
     
@@ -133,17 +137,13 @@ type PostgresPageData(log: ILogger) =
     let findListed webLogId =
         log.LogTrace "Page.findListed"
         Custom.list
-            $"{selectWithCriteria Table.Page} ORDER BY LOWER(data->>'{nameof Page.Empty.Title}')"
-            [ jsonParam "@criteria" {| webLogDoc webLogId with IsInPageList = true |} ]
-            pageWithoutText
+            sortedPages [ jsonParam "@criteria" {| webLogDoc webLogId with IsInPageList = true |} ] pageWithoutText
     
     /// Get a page of pages for the given web log (without revisions)
     let findPageOfPages webLogId pageNbr =
         log.LogTrace "Page.findPageOfPages"
         Custom.list
-            $"{selectWithCriteria Table.Page}
-               ORDER BY LOWER(data->>'{nameof Page.Empty.Title}')
-               LIMIT @pageSize OFFSET @toSkip"
+            $"{sortedPages} LIMIT @pageSize OFFSET @toSkip"
             [ webLogContains webLogId; "@pageSize", Sql.int 26; "@toSkip", Sql.int ((pageNbr - 1) * 25) ]
             (fun row -> { fromData<Page> row with Metadata = []; PriorPermalinks = [] })