Problems that occurred

Create the learned app in the same way for the output of Progate learning. Content that displays the poster and the image of the poster on the post list screen.

When I typed it according to the sample, I got an error of ʻundefined method'image_name' for nil: NilClass` But.

What I tried

-Check if there are any input errors in post.rb, views / posts / index.html.erb, related part methods, src values, etc. → No problem

Solution

As a result of google and various trials, rails db: migrate was done.

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