From 74541c7bd7005fb945957bbace348d4a8c59602c Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 9 Dec 2022 18:22:20 +0800
Subject: Develop secret api. v21

---
 .../CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs   | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'docker/crupest-api/CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs')

diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs b/docker/crupest-api/CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs
index 05ee269..91e49f8 100644
--- a/docker/crupest-api/CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Commons/Crud/ColumnMetadata.cs
@@ -7,7 +7,16 @@ public static class ColumnMetadataKeys
     public const string IsPrimaryKey = nameof(ColumnAttribute.IsPrimaryKey);
     public const string IsAutoIncrement = nameof(ColumnAttribute.IsAutoIncrement);
     public const string Index = nameof(ColumnAttribute.Index);
+
+    /// <summary>
+    /// This will add hooks for string type column to coerce null to ""(empty string) when get or set. No effect on non-string type.
+    /// </summary> 
     public const string DefaultEmptyForString = nameof(ColumnAttribute.DefaultEmptyForString);
+
+    /// <summary>
+    /// This indicates that you take care of generate this column value when create entity. User calling the api can not specify the value.
+    /// </summary>
+    public const string ClientGenerate = nameof(ColumnAttribute.DefaultEmptyForString);
 }
 
 public interface IColumnMetadata
@@ -72,9 +81,12 @@ public class ColumnAttribute : Attribute, IColumnMetadata
     // default None
     public ColumnIndexType Index { get; init; } = ColumnIndexType.None;
 
-    // Use empty string for default value of string type.
+    /// <see cref="ColumnMetadataKeys.DefaultEmptyForString"/>
     public bool DefaultEmptyForString { get; init; }
 
+    /// <see cref="ColumnMetadataKeys.ClientGenerate"/>
+    public bool ClientGenerate { get; init; }
+
     public bool TryGetValue(string key, out object? value)
     {
         var property = GetType().GetProperty(key);
-- 
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