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I’m a beginner in Ruby, and I made this mistake...
def new
@section = Section.new({:page_id => @page.id, :name => "Default"})
@pages = @page.subject.pages.sorted
@section_count = Section.count + 1
end
Tell me the problem is on line two, someone can help me?
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It’s got a hell of a face to be a method new in a controller of a Rails application where @page would be being initialized somewhere out of of the method, probably in a before_action. If you don’t initialize @page with something, it is automatically initialized with nil and will give this error there. Search in your controller where you have some reference to @page that you will find (or not, if not there) your problem.
That’s right, if the error continues, create an if @page.present? before calling it, because what happens is that @page is an object, and it’s trying to call an attribute from an object that doesn’t exist, this generates an exception...
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Apparently,
@pageis not initialized. Boot aputs @pageat the very beginning of the method– Jefferson Quesado
continues to make the same mistake
– Alexandre Seabra
Of course it will give the same error. I am interested in debugging to know what the value of
@page. He hasn’t printed anything? How are you testing your code?– Jefferson Quesado
did not print anything, I am trying to access the page sections/new from the browser
– Alexandre Seabra
You start the application from a terminal?
– Jefferson Quesado
yes, but also not print anything on the terminal
– Alexandre Seabra
Where would you like to see the information at
@page? Who fills in this information for you to seek theidhers?– Jefferson Quesado
If possible, there are more details about the class created by you?
– Jefferson Quesado
Ok, I confirmed here by reading several examples. When you call the
new, your object is still empty. Therefore,@pagehas valuenil. You need to pass as an argumentnewsomething he can start@page– Jefferson Quesado