How to change inheritance from ContentPartRecord to ContentPartVersionRecord - orchardcms

Question

OrchardCMS developers/users,
I have
public class MyContentPartRecord : ContentPartRecord
{ ... }
I want to change it to
public class MyContentPartRecord : ContentPartVersionRecord
{ ... }
In order to be able to create drafts for this part.
I add to Migraions
SchemaBuilder.AlterTable(
"MyContentPartRecord",
table =>
table
.AddColumn<int>("ContentItemRecord_id")
);
I run the app and the result is on get a content item of MyContentPart it creates an empty published version.
In db for MyContentPartRecord table:
Id [..fields..] ContentItemRecord_Id
657 NULL,.. 67
67 'MYDATA',... NULL
How to create a valid draftable MyContentPart?
UPDATE. I've tried with no success to add:
SchemaBuilder.ExecuteSql(#"
UPDATE MyContentPartRecord
SET ContentItemRecord_id = t2.ContentItemRecord_id
from MyContentPartRecord t1 inner join Orchard_Framework_ContentItemVersionRecord t2 on t1.id= t2.id
");
as it seems that orchard can't work with old records from MyContentPartRecord table as they don't have ContentItemRecord_id set.

Answer 1

You won't be able to do that without a manual SQL script.
The Id means a different thing for those two:
for ContentPartRecord it's a foreign key to an Id of a ContentItemRecord
for ContentPartVersionRecord it's a foreign key to an Id of a ContentItemVersionRecord
So after adding a new column ContentItemRecord_id you need to
first, copy existing data from Id column to ContentItemRecord_id and then
fill Id column with proper ids of the Latest version of each of those items. Version records are kept in Orchard_Framework_ContentItemVersionRecord table.

Answer 2

With the Piotr's help here is a solution. The following to be put in Migrations.cs:
SchemaBuilder.AlterTable(
"MyContentPart",
table =>
table
.AddColumn<int>("ContentItemRecord_id")
);
SchemaBuilder.ExecuteSql(#"
ALTER TABLE MyModuleName_MyContentPart
DROP CONSTRAINT PK__MyModuleName_W__3214EC072C83793F
");
SchemaBuilder.ExecuteSql(#"
INSERT INTO MyModuleName_MyContentPart
(Id, ContentItemRecord_id, Field1, Field2)
SELECT t3.Id AS id, t2.Id AS ContentItemRecord_id, t2.Field1, t2Field2
FROM MyModuleName_MyContentPart AS t2 LEFT OUTER JOIN
Orchard_Framework_ContentItemVersionRecord AS t3 ON t2.Id = t3.ContentItemRecord_id
WHERE (t3.Latest = 1) AND (NOT (t3.Id IS NULL))
");
SchemaBuilder.ExecuteSql(#"
DELETE FROM MyModuleName_MyContentPart
WHERE ContentItemRecord_id is NULL
");
SchemaBuilder.ExecuteSql(#"
ALTER TABLE MyModuleName_MyContentPart
ADD CONSTRAINT PK_MyModuleName_MyContentPart_ID PRIMARY KEY (Id)
");
UPDATE.
The final solution:
SchemaBuilder.AlterTable(
"MyContentPart",
table =>
table
.AddColumn<int>("ContentItemRecord_id")
);
SchemaBuilder.ExecuteSql(#"
ALTER TABLE MyModuleName_MyContentPart
DROP CONSTRAINT PK__MyModule_W__3214EC072C83793F
");
SchemaBuilder.ExecuteSql(#"
INSERT INTO MyModuleName_MyContentPart
(Id, ContentItemRecord_id, Field1)
SELECT V.Id as Id
,T.Id as ContentItemRecord_id
,Field1
FROM [MyModuleName_MyContentPart] T
LEFT OUTER JOIN
Orchard_Framework_ContentItemVersionRecord AS V ON V.ID in
(select top(1) Id
from Orchard_Framework_ContentItemVersionRecord
where ContentItemRecord_id = T.ID
order by latest desc, id desc)
");
SchemaBuilder.ExecuteSql(#"
DELETE FROM MyModuleName_MyContentPart
WHERE ContentItemRecord_id is NULL
");
SchemaBuilder.ExecuteSql(#"
ALTER TABLE MyModuleName_MyContentPart
ADD CONSTRAINT PK_MyModuleName_MyContentPart_ID PRIMARY KEY (Id)
");
}

Answer 3

Here's a more generic solution that can go in your migration.cs file based on #Artjom and #PiotrSzmyd's soltuion. This solution handles the fact that the automatically generated primary key may be named differently for each user of your module. Also the table name may be prefixed if a user has defined a global database prefix (eg. when using multi-tenant).
// Manually add the column that is required for the part to be a ContentPartVersionRecord
SchemaBuilder.AlterTable("MyCustomPartRecord", table => table.AddColumn<int>("ContentItemRecord_id"));
// Get table name
var tablePrefix = String.IsNullOrEmpty(_shellSettings.DataTablePrefix) ? "" : _shellSettings.DataTablePrefix + "_";
var tableName = tablePrefix + "MyModule_MyCustomPartRecord";
// Drop the primary key
SchemaBuilder.ExecuteSql(string.Format(#"
DECLARE #primaryKeyName NVARCHAR(MAX)
SELECT #primaryKeyName = constraint_name
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE CONSTRAINT_TYPE = 'Primary Key' and TABLE_NAME = '{0}'
EXEC(N'ALTER TABLE {0} DROP CONSTRAINT ' + #primaryKeyName)
", tableName));
// Migrate IDs to ContentItemRecord_id
SchemaBuilder.ExecuteSql(string.Format(#"
INSERT INTO {0} (Id, ContentItemRecord_id, Category_Id, ItemCode, Name, Description, DisplayOrder, Location, MaintenanceFrequency, MaintenanceFrequencyMultiplier, MaintenanceStartDate, Notes, IsEnabled)
SELECT V.Id as Id, T.Id as ContentItemRecord_id, Category_Id, ItemCode, Name, Description, DisplayOrder, Location, MaintenanceFrequency, MaintenanceFrequencyMultiplier, MaintenanceStartDate, Notes, IsEnabled
FROM {0} T
LEFT OUTER JOIN
{1}Orchard_Framework_ContentItemVersionRecord AS V ON V.ID in
(select top(1) Id
from {1}Orchard_Framework_ContentItemVersionRecord
where ContentItemRecord_id = T.ID
order by latest desc, id desc)
", tableName, tablePrefix));
// Remove old rows (no ContentItemRecord_id value)
SchemaBuilder.ExecuteSql(string.Format(#"
DELETE FROM {0}
WHERE ContentItemRecord_id is NULL
", tableName));
// Re-add the primary key
SchemaBuilder.ExecuteSql(string.Format(#"
ALTER TABLE {0}
ADD CONSTRAINT PK_{0}_Id PRIMARY KEY (Id)
", tableName));