ruby on rails - PG::UndefinedTable: ERROR: relation "..." does not exist -

on migration following error message:

pg::undefinedtable: error:  relation "actioncodes" not exist : alter table "organizations" add constraint "fk_rails_4ecaa2493e" foreign key ("actioncode_id")   references "actioncodes" ("id") 

i have following migration file organizations:

class createorganizations < activerecord::migration   def change     create_table :organizations |t|       t.string     :name,         null: false,    limit: 40       t.references :actioncode,   index: true,    foreign_key: true       t.boolean    :activated       t.datetime   :activated_at        t.timestamps null: false     end   end end 

and actioncodes have migration file:

class createactioncodes < activerecord::migration   def change     create_table :actioncodes |t|       t.string  :code,          null: false,  limit: 20       t.string  :description,                 limit: 255        t.timestamps null: false     end   end end class addindextoactioncodescode < activerecord::migration   def change     add_index :actioncodes, :code,  unique: true   end end 

the organization model file includes: belongs_to :actioncode.

while actioncodes model file includes: has_many :organizations.

any idea causing error message?

if remove index: true, foreign_key: true migration file, migrates without errors. , when replace line incorrect line t.references :actioncode_id, index: true, foreign_key: true, gives error below, last line ("ids") suggests rails somehow seems have problem name of table?

pg::undefinedtable: error:  relation "actioncode_ids" not exist : alter table "organizations" add constraint "fk_rails_604f95d1a1" foreign key ("actioncode_id_id")   references "actioncode_ids" ("id") 

so issue happening because createorganizations migration being run before createactioncodes executed.

createactioncodes run first thereby ensuring action codes table exists.

the order in migrations run based on time stamp of migration - indicated in name of file. 20141014183645_create_users.rb run before 20141014205756_add_index_to_users_email.rb timestamp of second 1 - 20141014205756 after of first 1 - 20141014183645.

make sure time-stamps of createorganizations migration after of createactioncodes migration.

either manually change timestamp in file names. or delete these migration files, , create them in correct order.