# HG changeset patch
# User jbe
# Date 1340145302 -7200
# Node ID faedbc8615e09d43a811e0756526b8a1e94c956a
# Parent  74efa44a0a4ddd7c8e753ca840a04e80683acc66
Allow particular records to be selected and/or disabled in ui.field.select{...}, even if they share the same key, and never select more than one record

diff -r 74efa44a0a4d -r faedbc8615e0 framework/env/ui/field/select.lua
--- a/framework/env/ui/field/select.lua	Fri Jun 15 22:10:39 2012 +0200
+++ b/framework/env/ui/field/select.lua	Wed Jun 20 00:35:02 2012 +0200
@@ -1,11 +1,12 @@
 --[[--
 ui.field.select{
-  ...                                 -- generic ui.field.* arguments, as described for ui.autofield{...}
+  ...                                  -- generic ui.field.* arguments, as described for ui.autofield{...}
   foreign_records  = foreign_records,  -- list of records to be chosen from, or function returning such a list
   foreign_id       = foreign_id,       -- name of id field in foreign records
   foreign_name     = foreign_name,     -- name of field to be used as name in foreign records
   format_options   = format_options    -- format options for format.string
-  disabled_records = disabled_records  -- table of record keys that should be disabled (NOTE: Preliminary. Argument name may change in future releases.)
+  selected_record  = selected_record   -- id of (or reference to) record which is selected (optional, overrides "value" argument when not nil)
+  disabled_records = disabled_records  -- table with ids of (or references to) records that should be disabled (stored as table keys mapped to true)
 }
 
 This function inserts a select field in the active slot. For description of the generic field helper arguments, see help for ui.autofield{...}.
@@ -50,14 +51,34 @@
               )
             }
           end
+          local one_selected = false
           for idx, record in ipairs(foreign_records) do
             local key = record[args.foreign_id]
+            local selected = false
+            if not one_selected then
+              if args.selected_record == nil then
+                if args.value == key then
+                  selected = true
+                end
+              else
+                if args.selected_record == record or args.selected_record == key then
+                  selected = true
+                end
+              end
+              one_selected = selected
+            end
+            local disabled = false
+            if args.disabled_records then
+              if args.disabled_records[record] or args.disabled_records[key] then
+                disabled = true
+              end
+            end
             ui.tag{
               tag     = "option",
               attr    = {
                 value    = key,
-                disabled = ((args.disabled_records and args.disabled_records[key] and "1" ) or nil),
-                selected = ((key == args.value) and "selected" or nil)
+                disabled = disabled and "disabled" or nil,
+                selected = selected and "selected" or nil
               },
               content = format.string(
                 record[args.foreign_name],