为什么Eclipse需要传入的网络连接（使用OS X）？(Why does Eclipse want incoming network connections (using OS X)?)

 Realm支持称为主键的东西，它看起来非常适合您的问题。 
 
 主键是Realm对象的唯一标识符; 它可以是整数或字符串。 在您的情况下，您可以使用URL作为主键（如果每个餐厅确实只与一个URL关联），或者添加新属性作为主键（可能是name字段）。 
 
 然后，您可以使用addOrUpdateObject:方法而不是addObject:方法。 此方法仅适用于具有主键的对象类型。 
 
 在您的情况下，假设您为Restaurant模型类型设置了主键，Realm将执行以下操作之一： 
 
 
 
 如果Restaurant之前已添加到Realm并且相对于您的新模型没有更改，则不会发生任何变化。 
 
 
 如果Restaurant之前已添加到Realm但您的模型已更改，则Realm中的现有模型将更新。 
 
 
 如果以前没有将Restaurant添加到Realm，则会添加它。 
 
 
 希望有所帮助。 

Realm supports something called primary keys, which seem like a good fit for your problem.
 
A primary key is a unique identifier for an Realm object; it can be an integer or a string. In your case, you might use the URL as the primary key (if each restaurant is indeed associated with only one URL), or add a new property to serve as the primary key (perhaps a name field).
 
You can then use the addOrUpdateObject: method instead of the addObject: method. This method only works for object types with primary keys.
 
In your case, assuming you set up a primary key for your Restaurant model type, Realm would do one of the following:
 
 
 
If the Restaurant was previously added to the Realm and has not changed relative to your new model, nothing will change.
 
 
If the Restaurant was previously added to the Realm but your model has since changed, the existing model in the Realm will be updated.
 
 
If the Restaurant wasn't previously added to the Realm, it will be added.
 
 
Hope that helps.