/// <summary>
/// Compare the entites and return the minimum set of changes that need to be made inorder to make the base entity
/// the same as the updated entity
/// </summary>
/// <param name="baseEntity"></param>
/// <param name="updatedEntity"></param>
public static Entity Delta(this Entity baseEntity, Entity updatedEntity)
{
//Clone the attribute
Entity clone = updatedEntity.Clone();
//Create a delta (do not update fields that have not changed)
foreach (var att in baseEntity.Attributes)
{
//Remove unchanged fields from the delta
if (clone.Attributes.Contains(att.Key))
{
//TODO: Clean up Attribute comparisons
var updatedAttribute = updatedEntity.Attributes.Where(a => a.Key == att.Key).First();
if (JsonAttribute.Create(att).Equals(JsonAttribute.Create(updatedAttribute)))
{
clone.Attributes.Remove(att.Key);
}
}
}
List <String> attributesToRemove = new List <string>();
foreach (var att in updatedEntity.Attributes)
{
//Do not set fields to NULL that are already not present
if (!baseEntity.Attributes.Contains(att.Key) && att.Value == null)
{
clone.Attributes.Remove(att.Key);
}
}
clone.Id = updatedEntity.Id;
return(clone);
}
/// <summary>
/// Customized Write to include type information and omit redundant information
/// </summary>
/// <param name="writer"></param>
/// <param name="value"></param>
/// <param name="serializer"></param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Entity entity = (Entity)value;
writer.WriteStartObject();
writer.WritePropertyName(nameof(entity.LogicalName));
writer.WriteValue(entity.LogicalName);
writer.WritePropertyName(nameof(entity.Id));
writer.WriteValue(entity.Id);
writer.WritePropertyName(nameof(entity.Attributes));
writer.WriteStartArray();
foreach (var item in entity.Attributes)
{
serializer.Serialize(writer, JsonAttribute.Create(item));
}
writer.WriteEndArray();
writer.WriteEndObject();
}
