ruby on rails - Why directly changing a migrate file does not change the schema file? -

ruby on rails - Why directly changing a migrate file does not change the schema file? -

my current migrate file is

class createmovies < activerecord::migration def create_table :movies, :force => true |t| t.string :title t.string :rating t.text :description t.datetime :release_date # add together fields allow rails automatically maintain track # of when movies added or modified: t.timestamps end end def downwards drop_table :movies end end

i seek alter release_date type integer. straight alter file

class createmovies < activerecord::migration def create_table :movies, :force => true |t| t.string :title t.string :rating t.text :description t.integer :release_date # add together fields allow rails automatically maintain track # of when movies added or modified: t.timestamps end end def downwards drop_table :movies end end

please pay attention, release_date type has been changed. after run

bundle exec rake db:migrate

it still produce same schema file before. confused.

it's because you've run migration. before want alter it, should rollback first:

bundle exec rake db:rollback

then should modify , run again:

bundle exec rake db:migrate

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