PG::DatatypeMismatch: ERROR: column "name_id" cannot be cast automatically to type integer HINT: You might need to specify "USING name_id::integer"

Question

I experienced this error when I tried to run rake db:migrate. rake aborted! StandardError: An error has occurred, this and all later migrations canceled:

PG::DatatypeMismatch: ERROR: column "developer_id" cannot be cast automatically to type integer HINT: You might need to specify "USING developer_id::integer".

I am changing my sqlite3 database to PostgreSQL for deployment in Heroku. I am assuming the error is coming from the db/migrate file.rb that has the developer_id column specified.

  def change
    change_column :entries, :developer_id, :integer
  end
end

I will add any other document that may help locate the problem.