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我正在使用Rails 5和PostGres 9.5。我想創建從我search_codes表的外鍵到我的地址表,所以我創造了這個遷移如何使用Rails 5遷移中的級聯刪除約束創建外鍵?
class CreateSearchCodeTable < ActiveRecord::Migration[5.0]
def change
create_table :search_codes do |t|
t.string :code
t.references :address, type: :string, index: true, foreign_key: true, on_delete: :cascade
t.index ["code"], name: "index_search_codes_on_code", unique: true, using: :btree
end
end
end
但是什麼被創建如下。通知似乎約束的級聯部分沒有得到創建
myapp=> \d search_codes;
Table "public.search_codes"
Column | Type | Modifiers
------------+-------------------+-----------------------------------------------------------
id | integer | not null default nextval('search_codes_id_seq'::regclass)
code | character varying |
address_id | character varying |
Indexes:
"search_codes_pkey" PRIMARY KEY, btree (id)
"index_search_codes_on_code" UNIQUE, btree (code)
"index_search_codes_on_address_id" btree (address_id)
Foreign-key constraints:
"fk_rails_6bd9792e3b" FOREIGN KEY (address_id) REFERENCES addresses(id)
如何創建使用Rails的5遷移和Postgres級聯的外鍵約束遷移?
很酷。我討厭它,當應該工作的東西(如指定「on_delete」)不。 – Dave