persist

The question is basically the same as below one: JPA cascade persist and references to detached entities throws PersistentObjectException. Why? I'm creating a new entity that references an existing, detached one. Now when I save this entity in my spring data repository an exception is thrown: org.springframework.dao.InvalidDataAccessApiUsageException: detached entity passed to persist if we look at the save() method in source code of spring data JPA we see: public <S extends T> S save(S entity) { if (entityInformation.isNew(entity)) { em.persist(entity); return entity; } else { return em.merge

I have a controller, with a route like this: #/articles/1234 I want to change the route without completely reloading the controller, so I can keep the position of other stuff in the controller constant (lists that scroll) I can think of a few ways to do this, but they're all pretty ugly. Is there a best practice for doing something like this? I tried experimenting with reloadOnSearch: false, but it doesn't seem to change anything. Jens X Augustsson Had the very same challange, Found a hack in another StackOverflow response that did the trick Fairly clean solution - all I did was to add these

I am loading an image from a URL provided by a third-party. There is no file extension (or filename for that matter) on the URL (as it is an obscured URL). I can take the data from this (in the form of NSData) and load it into a UIImage and display it fine. I want to persist this data to a file. However, I don't know what format the data is in (PNG, JPG, BMP)? I assume it is JPG (since it's an image from the web) but is there a programmatic way of finding out for sure? I've looked around StackOverflow and at the documentation and haven't been able to find anything. TIA. Edit: Do I really need