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GitHub User: bodaonline
this works, thanks!
Mind you: In rails 4 dont use attr_accessible in the model, instead in the controller add:
params.require(:post).permit(:title, :intro, :content, :user_id, :tag_list)
ehh this took me an hour to figure out :)
ps: nice to add this in the modell though:
validates :tag_list, presence: true