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song.go
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song.go
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package model
import (
"database/sql"
uuid "github.com/satori/go.uuid"
"log"
)
// Song ... tbd
type Song struct {
ID uuid.NullUUID `sql:",pk,type:uuid default uuid_generate_v4()" json:"-"`
Title string `json:"title,omitempty"`
Link string `json:"link,omitempty"`
Author string `json:"author,omitempty"`
Album string `json:"album,omitempty"`
Verses []Verse `json:"verses,omitempty"`
}
// Verse ... tbd
type Verse struct {
ID uuid.NullUUID `sql:",pk,type:uuid default uuid_generate_v4()" json:"-"`
Ordinal int `json:"order"`
Verse string `json:"verse,omitempty"`
SongID uuid.NullUUID `sql:",type:uuid" json:"-"`
}
// SaveSong ... tbd
func (s *Song) SaveSong(db *sql.DB) error {
err := db.QueryRow("INSERT INTO songs(title, link, author, album) VALUES($1, $2, $3, $4) RETURNING id",
s.Title, s.Link, s.Author, s.Album).Scan(&s.ID)
if err != nil {
return err
}
log.Printf("Persisted song id -> %s", s.ID.UUID.String())
for _, v := range s.Verses {
v.SongID = s.ID
v.saveVerse(db)
}
return nil
}
// saveVerse ... tbd
func (v *Verse) saveVerse(db *sql.DB) error {
err := db.QueryRow("INSERT INTO verses(ordinal, verse, song_id) VALUES($1, $2, $3) RETURNING id",
v.Ordinal, v.Verse, v.SongID).Scan(&v.ID)
if err != nil {
return err
}
log.Printf("Persisted verse id -> %s", v.ID.UUID.String())
return nil
}
// FindSongByID ... tbd
func FindSongByID(db *sql.DB, id string) (Song, error) {
rows, err := db.Query(`
SELECT songs.id, songs.title, songs.link, songs.author, songs.album, verses.ordinal, verses.verse
FROM songs
INNER JOIN verses
ON songs.id=verses.song_id
WHERE songs.id = $1`, id)
if err != nil {
log.Fatalf("Such error: %s", err.Error())
return Song{}, err
}
defer rows.Close()
var s Song
verses := []Verse{}
for rows.Next() {
var v Verse
if err := rows.Scan(&s.ID, &s.Title, &s.Link, &s.Author, &s.Album, &v.Ordinal, &v.Verse); err != nil {
log.Fatalf("Such error: %s", err.Error())
return Song{}, err
}
verses = append(verses, v)
}
s.Verses = verses
return s, nil
}
// FetchNameToIDMapByName ... tbd
func FetchNameToIDMapByName(db *sql.DB, name string) (map[string]string, error) {
rows, err := db.Query(`SELECT songs.id, songs.title FROM songs WHERE songs.title ILIKE '%` + name + `%'`)
if err != nil {
log.Fatalf("Such SQL error: %s", err.Error())
return make(map[string]string, 0), err
}
defer rows.Close()
nameToID := make(map[string]string, 0)
for rows.Next() {
var s Song
if err := rows.Scan(&s.ID, &s.Title); err != nil {
log.Fatalf("Such rows mapping error: %s", err.Error())
return make(map[string]string, 0), err
}
nameToID[s.ID.UUID.String()] = s.Title
}
return nameToID, nil
}