If a user wants json output then try best to render json output. In such cases prefer kind_of(String) over respond_to?(to_str)

[#5841 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

If a nested_attribute is being marked for destruction and at the same time an attr_accessor value is being assigned then the value being assigned is being ignored. This patch is a fix for that issue.

[#5939 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

HTTP_ACCEPT parameter

a test case which expects image/* to not to be
expanded. So I am leaving image/* as it is and
process only text/* and application/*

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

[#6022 state:resolved]