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Railsで既存DBのModelを生成する

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普通にmodelを生成して扱おうと思っていたら
rails mysql2 error table doesn't exist
が出てしまった。解決に手間取ったのでメモ

self.table_nameで解決できる。
まずは、migrationを作成したくないので--migration=falseオプションをつけてモデルを生成する。

$ bundle exec rails g model user --migration=false

そして、モデルクラスに既存のテーブル名を指定する。

class User < ActiveRecord::Base
    self.table_name = 'user'
end
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