Errors written by the orchard module and Their Solutions

Some unexpected errors occurred while writing the custom module. When solving these problems, we deepened our understanding of orchard development.

1. When a part is edited, the part interface is not always displayed.

Check all the files and find that the service is not added to the constructor in the partdriver class,

Original statement:

   Public   Class Fixedassetpartdriver: contentpartdriver <fixedassetpart> {  Private   Readonly  Inotifier _ notifier;  Private   Const   String Templatename = "  Parts/fixedasset "  ;  Private   Readonly  Ifixedassetservice _ service;  Protected   Override   String  Prefix {  Get { Return   "  Fixedasset  "  ;}}  Public Localizer t { Get ; Set  ;}  Public  Fixedassetpartdriver (inotifier notifier)  //  Public fixedassetpartdriver (inotifier notifier, ifixedassetservice Service)  {_ Notifier = Notifier;  //  _ Service = service; T = Nulllocalizer. instance ;} 

Updated statement:

 PublicFixedassetpartdriver (inotifier notifier, ifixedassetservice Service) {_ notifier=Notifier; _ service=Service; t=Nulllocalizer. instance ;}
 

 
IfixedassetserviceThe data called by her is not instantiated, so it cannot appear, and no Part Page is displayed.

2. When updating data, the error of null ID is displayed, and no reason is found for a few days. I read the latest document and found that I did not pay attention to the details.
See the originalCode:
 

  Public   Class Fixedassetpart: contentpart <fixedassetpartrecord> {  Public   String Assetcode {  Get { Return  Record. assetcode ;}  Set {Record. assetcode = Value ;}}  Public   String  Assetname {  Get { Return  Record. assetname ;}  Set {Record. assetname =Value ;}}  Public   String  Brand {  Get { Return  Record. Brand ;}  Set {Record. Brand = Value ;}}  Public   Decimal  Assetvalue {  Get { Return Record. assetvalue ;}  Set {Record. assetvalue = Value ;}}  Public  Assetbuymethodrecord assetbuymethod {  Get { Return  Record. assetbuymethod ;}  Set {Record. assetbuymethod = Value ;}} 

Migration class:

Schemabuilder. createtable ( Typeof (Fixedassetpartrecord). Name, T => T. contentpartrecord (). Column < String > ( "  Assetcode  "  ). Column < String > ( "  Assetname  "  ). Column < String > ("  Brand  "  ). Column < Decimal > ( "  Assetvalue  "  ). Column < Int > ( "  Assetbuymethodrecord_id  "  )); 

The relationship between fixedassetpartrecord and assetbuymethodrecord is one-to-many. The columns in all fixedassetpartrecord tables should beAssetbuymethodrecord_id,

In fact, it should be the name of the fixedassetpart attribute plus _ id, that isAssetbuymethod_ Id

Therefore, the Migration. CS table creation should be:

Schemabuilder. createtable ( Typeof  (Fixedassetpartrecord). Name, T => T. contentpartrecord (). Column < String > ( "  Assetcode  "  ). Column <String > ( "  Assetname  "  ). Column < String > ( "  Brand  "  ). Column < Decimal > ( "  Assetvalue  "  ). Column < Int > ( "  Assetbuymethod_id  "  )); 

It took me three days to find the reason for such a small detail.