database error when create api with this link

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 This is the very good link for the api

https://medium.com/@oliver.seq/creating-a-rest-api-with-rails-2a07f548e5dc


solution is in that ::

https://stackoverflow.com/questions/41539905/new-rails-install-activerecordnodatabaseerror-fatal-role-does-not-exist/42046252


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