<Dot installation> Introduction to Ruby on Rails5 Source code comparison

What to do if you get an error while creating a Rails lesson blog app. There is an item called "Source Code" at the bottom of the dot installation video playback screen, and if you click on it, an item called "Compare with your own code" will appear.
Therefore, it will automatically compare the model code with your own code (copy and paste is OK), so if you do not know the error part yourself, you can match the answers.

I haven't figured out what's going on yet, so when I got an error, I thought, "I'm stuck ...", but with dot installation, "relief measures" are properly taken, and I managed to proceed: joy:

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