hibernate - 仅将一些属性绑定(bind)到 grails 域对象上？

Question

我有一张这样的 map :
['var1':'property1', 'var2':'3']
和这样的类(class):

class MyClass{
   MyEnum var1
   int var2
   String var3
}
enum MyEnum{
   PROP1( "property1" )
   PROP2( "property2" );

   private final String variable;

   public MyEnum( String variable ){ this.variable = variable }
   public String getVariable(){ return variable }
}

我想尝试绑定(bind)var1和 var2到一些现有的对象上来获得验证，但我该怎么做呢？

Answer 1

您可以使用 bindData在 Controller 内部。此方法具有可选参数，允许您显式声明绑定(bind)应包含或排除哪些属性，例如

def map = ['var1':'property1', 'var2':'3']
def target = new MyClass()

// using inclusive map
bindData(target, map, [include:['var1', 'var2']])

// using exclusive map
bindData(target, this.params, [exclude:['var2']])

如果您想在 Controller 外部进行这种绑定(bind)，请使用 org.codehaus.groovy.grails.web.binding.DataBindingUtils 的方法之一。 ，例如

/**
 * Binds the given source object to the given target object performing type conversion if necessary
 *
 * @param object The object to bind to
 * @param source The source object
 * @param include The list of properties to include
 * @param exclude The list of properties to exclud
 * @param filter The prefix to filter by
 *
 * @return A BindingResult or null if it wasn't successful
 */
public static BindingResult bindObjectToInstance(Object object, Object source, List include, List exclude, String filter) 

这是使用此方法执行与 bindData 的“包含映射”调用相同的绑定(bind)的示例。多于

def map = ['var1':'property1', 'var2':'3']
def target = new MyClass()
DataBindingUtils.bindObjectToInstance(target, map, ['var1', 'var2'], [], null)