I have a file on server that can be written by a group. The group is called "deploy" and the user is "mima." I have verified "mima" is in "deploy" with:
$ id mima uid=1001(mima) gid=1002(mima) groups=1002(mima),1000(wheel),1001(deploy)
The permissions on the file I want to edit are:
$ ls -l application_helper.rb -rw-rw-r-- 1 deploy deploy 460 2012-08-13 21:30 application_helper.rb
This seems like it should work because the group deploy can write and mima is in that group, but I do get a permissions error.