[RUBY] When I tried to reproduce Progate's Rails app on my PC (local environment), I got stuck at the image display

Overview When I tried to reproduce Progate's Rails app on my PC (local environment), I got stuck at the image display.

Development environment

macOS catalina version 10.15.6

Rails 6.0.3.2

Local development environment

Error message

undefined method `image_name' for nil:NilClass

Solution

It seems that an error has occurred because there is a post that was posted so far (post before adding the image_name column) → I should have erased everything

__ How to delete previous posts __

rails console

Post.destroy_all

This completes the deletion!

After deleting the record that caused the error (the record that does not have a column called image_name), the image was displayed safely.

Impressions

Can I reproduce Progate's Rails course app (Tweet app) on my PC (local environment)? With that feeling, when I was copying sutras while looking at Progate as a review so far, I was confused with an error message even though it should have been reproduced in exactly the same way.

It's a lot of learning because it gives you errors that you couldn't get with Progate.

(Later talk) Actually completed app

I wrote the following article about the actually completed application.

https://qiita.com/tamapora/items/abab44dd099603d87f3e

Helpful page

https://teratail.com/questions/231403

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