How can I see what garbage collector (CMS, Parallel and so on) is running by looking at gc logs for minor and major collection? I don't have access to the command line options set to java (the sysadm for the appserver wont let me see them). I do have rather verbose gc logs.
我认为你的意思是一对多的单向映射,尝试如下: @OneToMany
@JoinColumn(name="product_id")
List myParts;
你可以在这里看到一个例子, @OneToMany 。 查看该链接中的“示例3”。 注意:由于您在parts表中将product_id作为外键,因此建议在Part类中也有Product type字段。 I think you mean a one-to-many unidirectional mapping, try something a ...
def self.get_ids(id_name, obj)
if obj.is_a? Enumerable
obj.collect {|e| e.send(id_name) }
else
obj.send(id_name)
end
end
或者, def self.get_ids(id_name, *objs)
objs.collect {|e| e.send(id_name) }
end
...
a << get_ids("car_id", some_object)
a ...
您可以将文档从一个集合复制/移动到另一个集合,而无需更改其_id就可以了。 如果您创建一个已经有_id的新文档,那么Mongoose / Mongo将使用它。 并且_id值只需要在单个集合中是唯一的,而不是在集合之间。 You can copy/move a doc from one collection to another without changing its _id just fine. If you create a new doc that already has an _id then Mo ...
可能有帮助的是在适配器上定义plurals 。 这看起来像这样: App.Adapter.configure('plurals', { "me": "me" });
希望能帮助到你。 What might help is to define plurals on your adapter. This could look like this: App.Adapter.configure('plurals', { "me": "me" });
Hope it helps.