[Rails] Smart way to add comments possibility on a model base to an app?

What would be a smart way to Add a comment form and lists comments on
a per model base?

Im building a social networking site and would like to have comments
on certain contents. I could add a comment form for every model
manually but what would be a better way to have comments added on a
per model base ? Where I could add something in the model and it would
include the comments, + new comment form?

Thx!

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