collect topological information on models

1 files changed, 8 insertions, 2 deletions

diff --git a/acf/model/node.lua b/acf/model/node.lua
index 380f809..eb06b2d 100644
--- a/acf/model/node.lua
+++ b/acf/model/node.lua
@@ -56,6 +56,9 @@ function TreeNode:init(context)
    util.update(mt, context)
 
    mt.meta = {}
+
+   if not mt.txn then return end
+
    if mt.parent then
       mt.meta['ui-name'] = getmetatable(mt.parent).mmeta(
 	 pth.name(mt.path)
@@ -118,6 +121,10 @@ function Collection:init(context, params)
    local field = BoundMember(self, params.field)
 
    local mt = getmetatable(self)
+   function mt.topology() return field:topology(pth.wildcard) end
+   function mt.valid_member(name) return true end
+
+   if not mt.txn then return end
 
    mt.meta.type = 'collection'
    mt.meta.members = field:meta(pth.wildcard)
@@ -125,8 +132,6 @@ function Collection:init(context, params)
       mt.meta['ui-name'], 's$', ''
    )
 
-   function mt.valid_member(name) return true end
-
    function mt.mmeta(name)
       local res = util.copy(mt.meta.members)
       res['ui-name'] = mt.meta['ui-member']..' '..name
@@ -210,6 +215,7 @@ meta = meta_func('meta')
 mmeta = meta_func('mmeta')
 parent = meta_func('parent')
 path = meta_func('path')
+topology = meta_func('topology')
 validate = meta_func('validate')