Adding some contstraints and relationships in the domain model

.gitignore

@@ -1 +1,4 @@
 target
+cafe-centro*.i*
+*.iml
+data

grails-app/domain/org/cafeCentro/Artist.groovy

@@ -0,0 +1,10 @@
+package org.cafeCentro
+
+class Artist {
+
+    String name;
+
+    static constraints = {
+        name(blank: false)
+    }
+}

grails-app/domain/org/cafeCentro/Event.groovy

@@ -0,0 +1,18 @@
+package org.cafeCentro
+
+class Event {
+
+    static hasMany = [artists:Artist]
+
+    Date lastUpdated
+    Date dateCreated
+
+    Date startTime
+    Venue venue
+    String name
+
+    static constraints = {
+        startTime(min: new Date())
+        name(blank: false)
+    }
+}

grails-app/domain/org/cafeCentro/Venue.groovy

@@ -0,0 +1,16 @@
+package org.cafeCentro
+
+class Venue {
+
+    String name
+    String address1
+    String address2
+    String city
+    String region
+    String zipCode
+    String coords
+
+    static constraints = {
+        zipCode(matches: /\d{5}/)
+    }
+}