Renamed Umbraco.Abstractions to Umbraco.Core

src/Umbraco.Core/Models/Validation/RequiredForPersistenceAttribute.cs

@@ -0,0 +1,31 @@
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Reflection;
+using Umbraco.Core.PropertyEditors;
+
+namespace Umbraco.Core.Models.Validation
+{
+    /// <summary>
+    /// Specifies that a data field value is required in order to persist an object.
+    /// </summary>
+    /// <remarks>
+    /// <para>There are two levels of validation in Umbraco. (1) value validation is performed by <see cref="IValueValidator"/>
+    /// instances; it can prevent a content item from being published, but not from being saved. (2) required validation
+    /// of properties marked with <see cref="RequiredForPersistenceAttribute"/>; it does prevent an object from being saved
+    /// and is used for properties that are absolutely mandatory, such as the name of a content item.</para>
+    /// </remarks>
+    public class RequiredForPersistenceAttribute : RequiredAttribute
+    {
+        /// <summary>
+        /// Determines whether an object has all required values for persistence.
+        /// </summary>
+        public static bool HasRequiredValuesForPersistence(object model)
+        {
+            return model.GetType().GetProperties().All(x =>
+            {
+                var a = x.GetCustomAttribute<RequiredForPersistenceAttribute>();
+                return a == null || a.IsValid(x.GetValue(model));
+            });
+        }
+    }
+}