feat: closes #18 added the code to generate models and other

logic/models/classes/main.go

@@ -33,6 +33,17 @@ func ListClasses(db *sql.DB, model_id string) (cls []ModelClass, err error) {
     return
 }
 
+func ModelHasDataPoints(db *sql.DB, model_id string) (result bool, err error) {
+    result = false
+    rows, err := db.Query("select mdp.id from model_data_point as mdp join model_classes as mc on mc.id = mdp.class_id where mc.model_id = $1 limit 1;", model_id)
+    if err != nil {
+        return
+    }
+    defer rows.Close()
+    
+    return rows.Next(), nil
+}
+
 var ClassAlreadyExists = errors.New("Class aready exists")
 
 func CreateClass(db *sql.DB, model_id string, name string) (id string, err error) {