fat model, skinny controller:

https://github.com/yshmarov/superails/commit/f5feafb177da05cf8f5f0f0f97330d47a0b50563
merge current_user in comment_params for new action:

https://github.com/yshmarov/superails/commit/22e82ba6fff0f5313e2d2db0e32bece73fa98a35
errors patial for form objects:

https://github.com/yshmarov/superails/commit/d321e0285872e82bb2606a2205c50c02f31faa04
create tags and taggings:

https://github.com/yshmarov/superails/commit/0373d1ff249334edb62f473a119517b7b742cef3
conter_cache comments to comments and posts:

https://github.com/yshmarov/superails/commit/762a9c144f3c7f439fb3a97f1fadd08531594e38