In MySQL, the text column size is 65,535 bytes by default (1 GiB in
PostgreSQL). It is sometimes too short when people want to use a text
column, so they sometimes change the text size to mediumtext (16 MiB) or
longtext (4 GiB) by giving the `limit` option.
Unlike MySQL, PostgreSQL doesn't allow the `limit` option for a text
column (raises ERROR: type modifier is not allowed for type "text").
So `limit: 4294967295` (longtext) couldn't be used in Action Text.
I've allowed changing text and blob size without giving the `limit`
option, it prevents that migration failure on PostgreSQL.
- config.load_defaults 6.0 in the dummy app and
fix the test since by default rails 6.0 configured
does not generate "utf8" hidden input, see #32125
- Use `ActiveRecord::Migration[6.0]` in the dummy app
since actiontext will be since Rails 6.0
- Fix `CreateActiveStorageTables` migration in the dummy app.
Add `t.foreign_key :active_storage_blobs, column: :blob_id`
It was added in 2ae3a29508.
- `rails/actiontext$ yarn install`
