GrailsModelsPart2

Album1.groovy

package recordstore

class Album {

	String name
	
	static constraints = {
	}
}

Album2_1.groovy

package recordstore

class Album {

	// Mappings
	static hasMany = [
		songs : Song 
	]
	
	
	// Properties
	String name
	
	static constraints = {
	}
}

albumHasManySongShouldCascadeSaves.groovy

@Test
void albumHasManySongShouldCascadeSaves() {
	def originalSongCount = Song.list().size()
	
	// Create and save an album
	def album = new Album( name: "Emotionalism" ).save()
	
	// Create a song without an album: shoudn't be valid
	def song = new Song( name: "Salvation Song" )
	
	album.addToSongs( song )

	// References should be set up
	assert song.album == album
	assert album.songs.contains( song )
	
	// Saving album should save song
	assert !song.id
	album.save()
	assert Song.list().size() == originalSongCount + 1
	assert song.id
}

DataSource.groovy

development {
    dataSource {
		dbCreate = "update" // one of 'create', 'create-drop', 'update', 'validate', ''
		url = "jdbc:mysql://localhost/recordstore_dev?useUnicode=yes&characterEncoding=UTF-8"
		username = "root"
		password = ""
		logSql = true
    }
}
test {
    dataSource {
		dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
		url = "jdbc:mysql://localhost/recordstore_test?useUnicode=yes&characterEncoding=UTF-8"
		username = "root"
		password = ""
		logSql = true
    }
}

settingSongsAlbumDoesntAddToAlbumsSongs.groovy

@Test
void settingSongsAlbumDoesntAddToAlbumsSongs() {
	// Create and save an album
	def album = new Album( name: "Emotionalism" ).save()
	
	// Create a song without an album: shoudn't be valid
	def song = new Song( name: "Salvation Song" )
	
	song.album = album

	// Back references should not be set up
	assert song.album == album
	assert album.songs == null
}

Song1.groovy

package recordstore

class Song {

	String name
	// Many-to-one Album
	Album album
		
	static constraints = {
	}
}

Song2_1.groovy

package recordstore

class Song {
	
	// Mappings
	static belongsTo = [
		album : Album
	]
	
	String name
	// Many-to-one Album
	Album album
		
	static constraints = {
	}
}

songBelongsToAlbumShouldCascadeDeletes.groovy

@Test
void songBelongsToAlbumShouldCascadeDeletes() {
	def originalSongCount = Song.list().size()
	
	// Create and save an album
	def album = new Album( name: "Emotionalism" )
	def song = new Song( name: "Salvation Song" )
	
	album.addToSongs( song )
	
	// Saving an album should also save its songs
	assert !album.id
	assert !song.id
	album.save()
	assert album.id
	assert song.id
	
	// Deleting an album should delete its songs
	album.delete()
	assert Song.list().size() == originalSongCount
}

songShouldHaveAnAlbum.groovy

@Test
void songShouldHaveAnAlbum() {
	// Create and save an album
	def album = new Album( name: "Emotionalism" ).save()
	
	// Create a song without an album: shoudn't be valid
	def song = new Song( name: "Salvation Song" )
	
	// Shouldn't validate, shouldn't have an id
	assert !song.validate()
	assert !song.id
	
	// Set its album: should validate and save
	song.album = album
	assert song.validate()
	song.save()
	assert song.id
}

Nice, but I still confused about hasMany and blongsTo works with Album album..