add pointer for ids

model/base.go

@@ -10,5 +10,5 @@ type CrudBase struct {
 }
 
 type IDBase struct {
-	ID int `gorm:"primary_key"`
+	ID *int `gorm:"primary_key"`
 }

model/model.go

@@ -2,19 +2,24 @@ package model
 
 import "time"
 
+// q:  why in tarnation are all the foreign keys pointers to ints?
+//
+// a:  so they will be true sqlite null values instead of go zero
+//     values when we save a row without that value
+
 // Album represents the albums table
 type Album struct {
 	IDBase
 	CrudBase
 	AlbumArtist   AlbumArtist
-	AlbumArtistID int    `gorm:"index" sql:"type:int REFERENCES album_artists(id) ON DELETE CASCADE"`
+	AlbumArtistID *int   `gorm:"index" sql:"type:int REFERENCES album_artists(id) ON DELETE CASCADE"`
 	Title         string `gorm:"not null;index"`
 	// an Album having a `Path` is a little weird when browsing by tags
 	// (for the most part - the library's folder structure is treated as
 	// if it were flat), but this solves the "American Football problem"
 	// https://en.wikipedia.org/wiki/American_Football_(band)#Discography
 	Path    string `gorm:"not null;unique_index"`
-	CoverID int    `sql:"type:int REFERENCES covers(id)"`
+	CoverID *int   `sql:"type:int REFERENCES covers(id)"`
 	Cover   Cover
 	Year    int
 	Tracks  []Track
@@ -34,9 +39,9 @@ type Track struct {
 	IDBase
 	CrudBase
 	Album         Album
-	AlbumID       int `gorm:"index" sql:"type:int REFERENCES albums(id) ON DELETE CASCADE"`
+	AlbumID       *int `gorm:"index" sql:"type:int REFERENCES albums(id) ON DELETE CASCADE"`
 	AlbumArtist   AlbumArtist
-	AlbumArtistID int `gorm:"index" sql:"type:int REFERENCES album_artists(id) ON DELETE CASCADE"`
+	AlbumArtistID *int `gorm:"index" sql:"type:int REFERENCES album_artists(id) ON DELETE CASCADE"`
 	Artist        string
 	Bitrate       int
 	Codec         string
@@ -51,7 +56,7 @@ type Track struct {
 	ContentType   string
 	Size          int
 	Folder        Folder
-	FolderID      int    `gorm:"not null;index" sql:"type:int REFERENCES folders(id) ON DELETE CASCADE"`
+	FolderID      *int   `gorm:"not null;index" sql:"type:int REFERENCES folders(id) ON DELETE CASCADE"`
 	Path          string `gorm:"not null;unique_index"`
 }
 
@@ -85,11 +90,11 @@ type Setting struct {
 type Play struct {
 	IDBase
 	User     User
-	UserID   int `gorm:"not null;index"`
+	UserID   *int `gorm:"not null;index"`
 	Album    Album
-	AlbumID  int `gorm:"not null;index"`
+	AlbumID  *int `gorm:"not null;index"`
 	Folder   Folder
-	FolderID int `gorm:"not null;index"`
+	FolderID *int `gorm:"not null;index"`
 	Time     time.Time
 	Count    int
 }
@@ -101,8 +106,8 @@ type Folder struct {
 	Name      string
 	Path      string `gorm:"not null;unique_index"`
 	Parent    *Folder
-	ParentID  int
-	CoverID   int
+	ParentID  *int
+	CoverID   *int
 	HasTracks bool `gorm:"not null;index"`
 	Cover     Cover
 	IsNew     bool `gorm:"-"`