Gorm What string to pass to Preload?

My foreign key column name doesn't match the folder it points to. I can't work out what to pass to preload.

Is it the struct name? the table? the model? the foreign key column? the struct member that holds the foreign key? something in gorm tags?

I have two models: File and Folder. File.ParentFolder points to Folder (File.ParentFolderID -> Folder.ID)

I've tried .Preload("Folder").Find(&file) and .Preload("ParentFolder").Find(&file) and neither result in form loading that File.Folder data for me.

type File struct {
    BasicModel     // <-- UUID has PrimaryKeys, otherwise the same as gorm.Model
    Name           string
    ParentFolderID string  `gorm:"column:parentfolderid"`
    ParentFolder   *Folder `gorm:"foreignKey:ParentFolderID"`
    InTrash        bool
}

type Folder struct {
    BasicModel
    Name           string
    ParentFolderID *string `gorm:"default:null"`
    ParentFolder   *Folder `gorm:"foreignKey:ParentFolderID"`
    InTrash        bool
}

The document you expected this should be explained

https://gorm.io/docs/preload.html

Expected answer

What to pass to .Preload() and maybe also .Join() . Table name? column name? Model name? Foreign key name?

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