Every import of the module changes, not only the seven packages that
moved out of sdk/pkg: Go requires the major version in the path from v2
on. Both happen in one pass —
go run github.com/go-admin-team/go-admin-core/tools/coreupgrade@v2.0.0 -w -v2 .
go mod tidy
— which is the command the release notes give, run here as a consumer
would run it. 210 imports across 95 files.
The compatibility shims this used are gone in v2, so the paths that
moved had to move: sdk/pkg/captcha, sdk/pkg/jwtauth and its user
package, sdk/pkg/response and sdk/pkg/casbin.
The count of unformatted files is unchanged at 34, none of them touched
by this: the tool reformats a file only if it was already gofmt clean,
so a migration cannot disappear into whitespace.
sys_user.username, sys_role.role_key and sys_dict_type.dict_type had no
unique index. Uniqueness was a SELECT COUNT followed by an INSERT, which
two concurrent requests both pass — and login resolves a username with
First, so which of the two accounts answers is whichever the database
returns.
The index cannot be on the key alone, because a soft-deleted row keeps
occupying the name and a deleted user's username could never be used
again. It has to include the delete marker, and the marker has to be
non-null: two live rows are (alice, NULL) and (alice, NULL), and NULL is
not equal to NULL, so an index over a nullable marker admits both. That
is the worst of the three states — a constraint that reads as protection
and binds nothing — and there is a test that demonstrates it rather than
asserting it.
ModelTime.DeletedAt is milliseconds since the epoch now, zero while the
row is live. Sixteen tables carry it; the migration converts each one,
preserving when each deleted row was deleted, then adds the three
indexes.
Written to be re-runnable rather than transactional, because DDL does not
roll back on MySQL and an operator whose first attempt failed halfway
should have nothing to do but run it again. It refuses before altering
anything if a table already holds duplicates, naming them, rather than
letting the index fail and leaving the operator to guess.
The timestamp conversion happens in Go: turning a timestamp into epoch
milliseconds is spelled differently by every dialect this supports, and
these row counts do not justify four versions of it.
zhangwenjian