"node-pg-migrate down" doesn't work when the "down" method is inferred

[jhs67]

Create a migration with no down method:

exports.up = function(pgm) {
  pgm.createTable("foo", { bar: "id" });
};

Run pg-migrate up and it shows:

### MIGRATION 1494965078152_foo (UP) ###
BEGIN;
CREATE TABLE "foo" (
  "bar" serial PRIMARY KEY
);
INSERT INTO "public"."pgmigrations" (name, run_on) VALUES ('1494965078152_foo', NOW());
COMMIT;

Then run pg-migrate down and it shows:

### MIGRATION 1494965078152_foo (UP) ###
BEGIN;
DROP TABLE "foo";
INSERT INTO "public"."pgmigrations" (name, run_on) VALUES ('1494965078152_foo', NOW());
COMMIT;

Note that is says it is running the UP migration, runs the command from the correct down migration, and then INSERT's instead of DELETE's from the pgmigrations table.

The problem seems to stem from the switch at line 59 of migrations.js. When the down migration is inferred this.up == this.down (see line 103 of migrations.js) so it always run the up action.

[dolezel]

Thanks for reporting! Will check