回答編集履歴
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answer
CHANGED
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@@ -29,5 +29,17 @@
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pool: 15
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```
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Clear DB を使う場合は、次の方法で `DATABASE_URL` を設定します:
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[ClearDB MySQL | Heroku Dev Center](https://devcenter.heroku.com/articles/cleardb#configuring-your-ruby-application-to-use-cleardb)
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```console
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$ heroku config | grep CLEARDB_DATABASE_URL
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CLEARDB_DATABASE_URL => mysql://adffdadf2341:adf4234@us-cdbr-east.cleardb.com/heroku_db?reconnect=true
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$ heroku config:set DATABASE_URL='mysql://adffdadf2341:adf4234@us-cdbr-east.cleardb.com/heroku_db?reconnect=true'
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Adding config vars:
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DATABASE_URL => mysql2://adffd...b?reconnect=true
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Restarting app... done, v61.
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```
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また、Clear DB と Rails の場合の公式な手順が次の記事に示されています
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[Connecting to ClearDB from Heroku using Ruby on Rails on Cedar – ClearDB](https://w2.cleardb.net/developers/resources/connect-ruby/#1.2)
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