rails migration runs on local Postgresql but fails on prod

rails migration runs on local Postgresql but fails on prod

In short, dropping, creating, and running migrate on the local Postgres
instance will work any number of times for creating a working database for
my app, but the same technique on Heroku's prod always produces:
heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.9674
PG::UndefinedTable: ERROR: relation "mytable" does not exist
LINE 5: WHERE a.attrelid = '"mytable"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull,
a.atttypid, a.atttypmod
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"mytable"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
rake aborted!
PG::UndefinedTable: ERROR: relation "mytable" does not exist
LINE 5: WHERE a.attrelid = '"mytable"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull,
a.atttypid, a.atttypmod
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"mytable"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
This is what works locally:
rake db:drop
rake db:create
rake db:migrate
I have
confirmed that Heroku's db is blank before migration by doing heroku
pg:psql and then \dt to verify 0 tables exist.
tried heroku pg:reset DATABASE before the migrate
confirmed both local and prod Postgres is version 9.2.4
tried renaming the "mytable" migration file in db/migrate to have the
earliest timestamp so as to get run first
This is a pretty simple app so it's very frustrating that something basic
like creating a db from scratch keeps failing. Any ideas?
"mytable" migration:
class CreateMytable < ActiveRecord::Migration
def change
create_table :mytable do |t|
t.string :codes
t.string :name
t.timestamps
end
end
end