GrailsModelsPart3

Album.groovy

package recordstore

class Album {

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

Artist.groovy

package recordstore

class Artist {

	String name
	
	static hasOne = [
		biography : Biography
	]
	
	static constraints = {
		biography( unique: true )
	}
}

Artist2.groovy

package recordstore

class Artist {

	String name
	
	static hasOne = [
		biography : Biography
	]
	
	static belongsTo = [
		album : Album
	]
	
	static hasMany = [
		album : Album
	]

	static constraints = {
		biography( unique: true )
	}
}

artistHasOneBiographyShouldCascadeSaves.groovy

@Test
void artistHasOneBiographyShouldCascadeSaves() {
	def originalBiographyCount = Biography.list().size()
	
	// Create a bio
	def bio = new Biography( content: "Two guys and friends from Concord, NC")
	
	// Create an artist
	def artist = new Artist( name: "The Avett Brothers", biography : bio )
	
	// References should be set up
	assert artist.biography == bio
	assert bio.artist == artist
	
	// Saving album should save song
	assert !bio.id
	artist.save()
	assert Biography.list().size() == originalBiographyCount + 1
	assert bio.id
}

artistIsManyToManyAlbum.groovy

@Test
void artistIsManyToManyAlbum() {
	// Note that we save from the 'owning' side!
	def originalArtistCount = Artist.list().size()
	
	def album = new Album( name : "Chimes of Freedom")
		.addToArtists( new Artist( name : "The Avett Brothers", biography : new Biography( content: "Two guys etc." ) ) )
		.addToArtists( new Artist( name : "Johnny Cash", biography : new Biography( content: "A man in 0x000000." ) ) )
		.save()
		
	assert album.id
	assert Artist.list().size() == originalArtistCount + 2
		
}

Biography.groovy

package recordstore

class Biography {

	static belongsTo = [
		artist : Artist	
	]
	
	String content
	
    static constraints = {
    }
}