检查表中存在的Rails [英] Check if a table exists in Rails

问题描述

我有一个rake任务，将无法正常工作，除非表存在。我有超过20名工程师在网站上的工作，所以我想，以确保他们在迁移表才可以做一个rake任务，将填充了相应的表格。

I have a rake task that won't work unless a table exists. I'm working with more than 20 engineers on a website so I want to make sure they have migrated the table before they can do a rake task which will populate that respective table.

AR是否有一个方法，例如 Table.exists ？我怎么能确保他们已成功迁移的表？

Does AR have a method such as Table.exists? How can I make sure they have migrated the table successfully?

推荐答案

在轨道2，3及4：

# Gives you a listing
ActiveRecord::Base.connection.tables
# Checks for existence of kittens table (Kitten model)
ActiveRecord::Base.connection.table_exists? 'kittens'

# Tells you all migrations run
ActiveRecord::Migrator.get_all_versions
# Tells you the current schema version
ActiveRecord::Migrator.current_version

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