Rails：delete_all 引发 PG::NotNullViolation

Question

我正在将一个包含数百行的 CSV 导入到我的 Rails 数据库中。

有时用户想要强制覆盖数据，所以我认为最好销毁所有数据并重新开始。

就像是：

account.catalog_listings.delete_all if should_refresh

CSV.foreach(file, options) do |row|
  account.catalog_listings.create!({...rowstuff})

问题是该delete_all行引发 PG 错误

ActiveRecord::StatementInvalid (PG::NotNullViolation: ERROR:  null value in column "account_id" violates not-null constraint
DETAIL:  Failing row contains (1, null, ... ... ).
: UPDATE "catalog_listings" SET "account_id" = NULL WHERE "catalog_listings"."account_id" = $1):
  app/models/catalog_listing.rb:41:in `import_catalog_listings'
  app/controllers/accounts_controller.rb:20:in `catalog'

我确实有null: false几个外键字段，但我不明白为什么delete_all要尝试删除外键而不是删除整个记录？

更新 - 当我改变时一切正常：

account.catalog_listings.delete_all if should_refresh

到：

account.catalog_listings.destroy_all if should_refresh

除了destroy遍历每一项并逐一删除：

  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 957]]
  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 958]]
  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 959]]
  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 960]]
  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 961]]
  SQL (0.1ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 962]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 963]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 964]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 965]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 966]]
  SQL (0.3ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 967]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 968]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 969]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 970]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 971]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 972]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 973]]
  SQL (0.3ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 974]]
  SQL (0.2ms)  DELETE FROM "catalog_listings" WHERE "catalog_listings"."id" = $1  [["id", 975]]

不酷...有人知道更好的方法吗？

Answer 1

尝试在您的模型中dependent: :destroy添加关联。catalog_listingsAccount

https://apidock.com/rails/ActiveRecord/Associations/CollectionProxy/delete_all