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Dump the database schema containing the current Rails version
Since rails#42297, Rails now generates datetime columns on MySQL with a default precision of 6. This means that users upgrading to Rails 7.0 from 6.1, when loading the database schema, would get the new precision value, which would not match the production schema. To avoid problems like this in the future, Rails will now freeze `ActiveRecord::Schema` class to be the 7.0 implementation, and will allow access to other version using the same mechanism of `ActiveRecord::Migration`. The schema dumper will generate the new format which will include the Rails version and will look like this: ``` ActiveRecord::Schema[7.0].define ``` Related to rails#43934 and rails#43909.
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