how to use strip_tags and truncate inside my Model.rb?

You can also access helpers in your models like this:

ActionController::Base.helpers.strip_tags(text)

ActionView::Base.full_sanitizer.sanitize(your_html_string)

This will work for you. Or you can define a helper like:

def strip_html_tags(string)
    ActionView::Base.full_sanitizer.sanitize(string)
end

And then use this like:

strip_html_tags(your_html_string)

To remove some specific tags pass additional parameters. Source: Sanitize Rails API Dock

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