feat(templateengine): ResolvedAttribute.DefaultDataSourceReference — pre-binding default for the Configure page; excluded from the revision hash (pinned)

2026-08-20 15:53:05 -04:00
parent 4cfd9337a3
commit 3acb79d97e
3 changed files with 103 additions and 1 deletions
@@ -78,6 +78,17 @@ public sealed record ResolvedAttribute
    /// </summary>
    public string? DataSourceReference { get; init; }

+    /// <summary>
+    /// The data-source reference as resolved from the template chain BEFORE any
+    /// per-instance <c>InstanceConnectionBinding.DataSourceReferenceOverride</c> was
+    /// applied — i.e. the template/composed default the Configure page shows as the
+    /// placeholder. Equals <see cref="DataSourceReference"/> when no override is set;
+    /// null for attributes that are not data-sourced.
+    /// Central-side presentation data only: deliberately excluded from the revision
+    /// hash (<c>RevisionHashService</c> projects through <c>HashableAttribute</c>).
+    /// </summary>
+    public string? DefaultDataSourceReference { get; init; }
+
    /// <summary>
    /// If data-sourced: the resolved connection ID from the instance binding.
    /// </summary>
@@ -369,6 +369,15 @@ public class FlatteningService
        Dictionary<string, ResolvedAttribute> attributes,
        IReadOnlyDictionary<int, DataConnection> dataConnections)
    {
+        // Capture the pre-binding default for EVERY data-sourced attribute (bound or
+        // not) so the Configure page can show the template default as a placeholder.
+        foreach (var key in attributes.Keys.ToList())
+        {
+            var attr = attributes[key];
+            if (attr.DataSourceReference is not null && attr.DefaultDataSourceReference is null)
+                attributes[key] = attr with { DefaultDataSourceReference = attr.DataSourceReference };
+        }
+
        foreach (var binding in bindings)
        {
            if (!attributes.TryGetValue(binding.AttributeName, out var existing))
@@ -385,7 +394,8 @@ public class FlatteningService
                BoundDataConnectionId = connection.Id,
                BoundDataConnectionName = connection.Name,
                BoundDataConnectionProtocol = connection.Protocol,
-                DataSourceReference = binding.DataSourceReferenceOverride ?? existing.DataSourceReference
+                DataSourceReference = binding.DataSourceReferenceOverride ?? existing.DataSourceReference,
+                DefaultDataSourceReference = existing.DefaultDataSourceReference ?? existing.DataSourceReference
            };
        }
    }