How to delete some associations from an ActiveRecord object without saving

问题

So I have:

@project = Project.last
@project.tasks = @project.tasks.reject{|o| o.stupid? }

# Do more stuff

When I update the tasks array, it actually saves it which we don't want.

How do we prevent that?

回答1:

The save happens when you reassign the result to @project.tasks.

Just don't reassign it, and use reject! to change the original @project.tasks:

@project = Project.last
@project.tasks.reject!{ |o| o.stupid? }

来源：https://stackoverflow.com/questions/22927284/how-to-delete-some-associations-from-an-activerecord-object-without-saving