Hi there. I am trying for an hour now to add a new datatype on ApplicationStartup.

I tride a fiew option and I even browsed the source code and checked DataType/PostSave. When I tried to replicate the procedure I get

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_cmsPropertyType_cmsDataType_nodeId". The conflict occurred in database "umbraco-cms", table "dbo.cmsDataType", column 'nodeId'.

Currently this is my code.

                  // dt DataType feched from service 
                  if (null == dt)
                    {
                        var df = Mapper.Map<IDataTypeDefinition>(new DataTypeSave()
                        {
                            Action = ContentSaveAction.SaveNew,
                            ParentId = -1,
                            Id = 0,
                            SelectedEditor = "MediaPublish.Versions",
                            Name = "Media Version",
                            PreValues = new List<PreValueFieldSave>()
                        });

                        dType.SaveDataTypeAndPreValues(df, new Dictionary<string, PreValue>());
                    }

I really need help.

Solved.. I only had to ask.. and I found the solution hidden in plain sight.

https://github.com/vegaitsourcing/uSiteBuilder/blob/master/source/Vega.USiteBuilder/DataTypeBuilder/DataTypeManager.cs