为什么在更新期间会丢失作为可标记的标记？

Question

我在一个 Ruby on Rails 应用程序中使用acts-as-taggable-on 来允许用户将标签添加到他们的联系人列表中（如带标签的地址簿）。使用标准 RESTful 路径 contacts/new、contacts/[:id]、contacts/:id/edit 等添加/更新带有标签的联系人非常适合用户。

我现在正在尝试添加功能，以便用户可以向联系人发送电子邮件，要求他们确认并填写详细信息。电子邮件请求包含一个链接，该链接指向建立在不同控制器上的页面，该控制器显示一个包含所有联系方式的表单（也称为“确认表单”），减去标签（对用户来说是个人的）。

电子邮件链接的格式为：

contact_confirmation/[:id]/edit?contact_id=[:contact_id]

[:id] 是一个令牌，可以一次性访问联系人以更新他们的详细信息（这就像一个非常标准的密码重置）。

确认表单正确更新了所有联系方式，但由于某种原因，标签丢失了。两种情况下的params[]都是一样的，更新方法也是一样的。

查看日志，它们与第一个 COMMIT 相同。然后确认表单开始一个新进程（BEGIN）并删除标签：

(0.2ms)  BEGIN
CACHE ActsAsTaggableOn::Tag Load (0.0ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = $1 AND "taggings"."taggable_type" = $2 AND (taggings.context = 'tags' AND taggings.tagger_id IS NULL)  [["taggable_id", 9], ["taggable_type", "Contact"]]
CACHE ActsAsTaggableOn::Tag Load (0.0ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = $1 AND "taggings"."taggable_type" = $2 AND (taggings.context = 'tags' AND taggings.tagger_id IS NULL)  [["taggable_id", 9], ["taggable_type", "Contact"]]
CACHE ActsAsTaggableOn::Tag Load (0.0ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = $1 AND "taggings"."taggable_type" = $2 AND "taggings"."tagger_id" = $3 AND "taggings"."tagger_type" = $4 AND "taggings"."context" = $5  [["taggable_id", 9], ["taggable_type", "Contact"], ["tagger_id", 1], ["tagger_type", "User"], ["context", "tags"]]
ActsAsTaggableOn::Tagging Load (0.6ms)  SELECT "taggings".* FROM "taggings" WHERE "taggings"."taggable_id" = $1 AND "taggings"."taggable_type" = $2 AND "taggings"."tagger_type" = $3 AND "taggings"."tagger_id" = $4 AND "taggings"."tag_id" IN (5, 43, 44) AND "taggings"."context" = $5  [["taggable_id", 9], ["taggable_type", "Contact"], ["tagger_type", "User"], ["tagger_id", 1], ["context", "tags"]]
SQL (0.5ms)  DELETE FROM "taggings" WHERE "taggings"."id" = $1  [["id", 152]]
ActsAsTaggableOn::Tag Load (0.5ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 5], ["LIMIT", 1]]
SQL (0.8ms)  UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = $1  [["id", 5]]
ActsAsTaggableOn::Tag Load (1.3ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 5], ["LIMIT", 1]]
SQL (0.8ms)  DELETE FROM "taggings" WHERE "taggings"."id" = $1  [["id", 153]]
ActsAsTaggableOn::Tag Load (0.4ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 43], ["LIMIT", 1]]
SQL (0.5ms)  UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = $1  [["id", 43]]
ActsAsTaggableOn::Tag Load (0.4ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 43], ["LIMIT", 1]]
ActsAsTaggableOn::Tagging Load (0.3ms)  SELECT "taggings".* FROM "taggings" WHERE "taggings"."tag_id" = $1  [["tag_id", 43]]
SQL (0.5ms)  DELETE FROM "tags" WHERE "tags"."id" = $1  [["id", 43]]
SQL (0.5ms)  DELETE FROM "taggings" WHERE "taggings"."id" = $1  [["id", 154]]
ActsAsTaggableOn::Tag Load (0.4ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 44], ["LIMIT", 1]]
SQL (0.9ms)  UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = $1  [["id", 44]]
ActsAsTaggableOn::Tag Load (0.4ms)  SELECT  "tags".* FROM "tags" WHERE "tags"."id" = $1 LIMIT $2  [["id", 44], ["LIMIT", 1]]
ActsAsTaggableOn::Tagging Load (0.5ms)  SELECT "taggings".* FROM "taggings" WHERE "taggings"."tag_id" = $1  [["tag_id", 44]]
SQL (2.0ms)  DELETE FROM "tags" WHERE "tags"."id" = $1  [["id", 44]]
ActsAsTaggableOn::Tag Load (3.1ms)  SELECT "tags".* FROM "tags" INNER JOIN "taggings" ON "tags"."id" = "taggings"."tag_id" WHERE "taggings"."taggable_id" = $1 AND "taggings"."taggable_type" = $2 AND "taggings"."tagger_id" = $3 AND "taggings"."tagger_type" = $4 AND "taggings"."context" = $5  [["taggable_id", 9], ["taggable_type", "Contact"], ["tagger_id", 1], ["tagger_type", "User"], ["context", "tags"]]
(1.2ms)  COMMIT

谁能帮我弄清楚为什么会这样？谢谢。

Answer 1

回答者：https://stackoverflow.com/a/25018540/6569994

我必须在联系人模型上将if tag_list_changed? 条件添加到set_tag_owner：

def set_tag_owner
  if tag_list_changed?
    set_owner_tag_list_on(account, :tags, tag_list)
    self.tag_list = nil
  end
end

我认为在正常形式下，每次都必须剥离并重新添加标签。