Are railcasts lessons up to date?

Question

Ruby on Rails

I recently started learning RoR and ran into a series of railscasts, but the problem is that a lot of videos were filmed for version 3 of rails. How relevant is what it says? How many changes have been made in version 4 of rails? How to filter the forgotten from the actual?

Answer 1

Relevant. Somewhere the syntax has changed, faced with this, there are no particular problems in the search for a new one.

Answer 2

try to do ... and understand what has changed

Answer 3

The so-called strong parameters (access to model objects)
in rails 4 have changed significantly; they are written in the controller in the form
def book_params
params.require(:book).permit(:title)
end
in rails 3.1, access was in models in the form
attr_accessible :title
In the rest of the "castes" of the video are still relevant, or corrections have been written in the comments to the videos.