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When I start doing code on (see image below) rails I saw rails guide to getting start with it. There's a command rails db:migrate for creating table and stuff. But its giving only warning and not creating any table.

Example

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The code has executed successfully and there are no issues with it. The warnings are because either your code, or some of the gems you have used in the code contain some methods that are deprecated. If the warning comes from your code, try to fix them. If it is from any dependency, then watch for updates, keep the gems updated, or you can also write to the gem developer to fix these warnings.