为模型定义tsvector类型列

I would like to add a column of type tsvector in postgres by defining a field in a model struct. It would look sort of like:

type Issue struct {
  ...
  TSV tsvector `json:"tsv"`
}

The reason is that I would like to use gorm's AutoMigrate to keep the tables up-to-date while developing. Any ideas?

type Address struct {
    TSV string         `gorm:"type:tsvector"`
}

Also refer https://github.com/jinzhu/gorm/blob/master/dialects/postgres/postgres.go, it should works similar like hstore, jsonb