schema.rb created when schema_format set to :sql

[jkogara]

Description

• As of rails 6.1 rake db:structure:{load|dump} are deprecated and db:schema:{load|dump} are called under the hood. This results in the schema task in hair trigger creating a schema.rb for the project even though it is not required.

Steps to Reproduce

• Create a new 6.1 rails app and set the schema_format to :sql
• Run migrations, a schema.rb will be created.

Possible Solution

• Update the schema:dump task in hair_trigger to use ActiveRecord::Base.schema_format value to determine if the schema.rb file should be generated.

[holstvoogd]

I've attempted a fix in my fork, basically just setting the previous schema before the regular tasks. It seems to work, but I'm not clear on the use case for setting the previous schema exactly; so I can't verify if everything still works; but the output is the same and when using format=sql, it does only generate a structure.sql.