Rails：元搜索在限定范围和分页时会中断吗？

Question

我有一组可搜索的照片，我想将索引页的结果限制为公开的结果（即不属于私人收藏，又名。 :collection_id=>nil ）。

我的模型中有以下范围：

scope :community, where(:collection_id => nil)

我的控制器中有以下内容：

def index
  @search = Photo.community.search(params[:search])
  @photos = @search.page(params[:page]).per(20)
end

我正在使用 Kaminari 对结果进行分页。

当我搜索未指定范围的照片（即 Photo.search(params[:search])）时，它工作正常。但是，当我使用此范围搜索照片时，分页会中断搜索。第一页显示正确，但当我转到另一页时没有结果。为了在本地测试这一点，我将分页更改为每页 1，但无论我在第一页之后搜索任何页面，仍然没有显示任何结果，即使分页器指示还有更多页面的结果。

我不知道如何调试和修复这个问题，我真的需要一些帮助。以下是来自开发日志的 SQL：

对于索引页的正常加载（无搜索）：

Started GET "/photos" for 127.0.0.1 at 2011-04-28 11:58:51 -0500
  Processing by PhotosController#index as HTML
  SQL (0.4ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'

  SQL (0.3ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'
  User Load (0.7ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Context Load (0.3ms)  SELECT "contexts".* FROM "contexts" ORDER BY "contexts"."display_order" ASC
  Focus Load (0.3ms)  SELECT "focus".* FROM "focus" ORDER BY "focus"."display_order" ASC
  LandUse Load (0.3ms)  SELECT "land_uses".* FROM "land_uses" ORDER BY "land_uses"."display_order" ASC
Rendered static/_help-context.html.haml (4.5ms)
Rendered static/_help-focus.html.haml (3.1ms)
Rendered photos/_search.html.haml (304.9ms)
  SQL (0.5ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL LIMIT 1 OFFSET 0
  Photo Load (1.0ms)  SELECT "photos".* FROM "photos" WHERE "photos"."collection_id" IS NULL LIMIT 1 OFFSET 0
  Attachment Load (0.2ms)  SELECT "attachments".* FROM "attachments" WHERE ("attachments".photo_id = 1)
  User Load (1.0ms)  SELECT "users".* FROM "users" WHERE ("users"."id" = 1)
  Profile Load (1.7ms)  SELECT "profiles".* FROM "profiles" WHERE ("profiles".user_id = 1) LIMIT 1
  Context Load (0.2ms)  SELECT "contexts".* FROM "contexts" WHERE "contexts"."id" = 6 ORDER BY "contexts"."display_order" ASC LIMIT 1
  Focus Load (0.1ms)  SELECT "focus".* FROM "focus" WHERE "focus"."id" = 2 ORDER BY "focus"."display_order" ASC LIMIT 1
  LandUse Load (0.2ms)  SELECT * FROM "land_uses" INNER JOIN "land_uses_photos" ON "land_uses".id = "land_uses_photos".land_use_id WHERE ("land_uses_photos".photo_id = 1 ) ORDER BY "land_uses"."display_order" ASC
Rendered photos/_photo_tiles.html.haml (62.2ms)
  SQL (0.2ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL
Rendered shared/_feedback.html.haml (1.5ms)
  Role Load (0.5ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
  CACHE (0.0ms)  SELECT "profiles".* FROM "profiles" WHERE ("profiles".user_id = 1) LIMIT 1
  CACHE (0.0ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
Rendered shared/_menu.html.haml (177.6ms)
Rendered shared/_footer.html.haml (2.7ms)
Rendered photos/index.html.haml within layouts/application (897.1ms)
Completed 200 OK in 1158ms (Views: 912.2ms | ActiveRecord: 8.2ms)

对于搜索的第一页（正常工作）：

Started GET "/photos?utf8=%E2%9C%93&search%5Bcontext_id_in%5D%5B%5D=6&search%5Btagged_with%5D=&search%5Btext_contains%5D=&search%5Bnear%5D%5B%5D=&search%5Bnear%5D%5B%5D=100&commit=Search" for 127.0.0.1 at 2011-04-28 12:00:39 -0500
  Processing by PhotosController#index as HTML
  Parameters: {"utf8"=>"✓", "search"=>{"context_id_in"=>["6"], "tagged_with"=>"", "text_contains"=>"", "near"=>["", "100"]}, "commit"=>"Search"}
  SQL (0.4ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'

  SQL (0.3ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'
  User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Context Load (0.4ms)  SELECT "contexts".* FROM "contexts" ORDER BY "contexts"."display_order" ASC
  Focus Load (0.3ms)  SELECT "focus".* FROM "focus" ORDER BY "focus"."display_order" ASC
  LandUse Load (0.4ms)  SELECT "land_uses".* FROM "land_uses" ORDER BY "land_uses"."display_order" ASC
Rendered static/_help-context.html.haml (4.6ms)
Rendered static/_help-focus.html.haml (3.1ms)
Rendered photos/_search.html.haml (161.0ms)
  SQL (0.4ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL AND "photos"."context_id" IN (6) LIMIT 1 OFFSET 0
  Photo Load (0.7ms)  SELECT "photos".* FROM "photos" WHERE "photos"."collection_id" IS NULL AND "photos"."context_id" IN (6) LIMIT 1 OFFSET 0
  Attachment Load (0.2ms)  SELECT "attachments".* FROM "attachments" WHERE ("attachments".photo_id = 1)
  User Load (0.9ms)  SELECT "users".* FROM "users" WHERE ("users"."id" = 1)
  Profile Load (1.9ms)  SELECT "profiles".* FROM "profiles" WHERE ("profiles".user_id = 1) LIMIT 1
  Context Load (0.2ms)  SELECT "contexts".* FROM "contexts" WHERE "contexts"."id" = 6 ORDER BY "contexts"."display_order" ASC LIMIT 1
  Focus Load (0.2ms)  SELECT "focus".* FROM "focus" WHERE "focus"."id" = 2 ORDER BY "focus"."display_order" ASC LIMIT 1
  LandUse Load (0.2ms)  SELECT * FROM "land_uses" INNER JOIN "land_uses_photos" ON "land_uses".id = "land_uses_photos".land_use_id WHERE ("land_uses_photos".photo_id = 1 ) ORDER BY "land_uses"."display_order" ASC
Rendered photos/_photo_tiles.html.haml (204.2ms)
  SQL (0.3ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL AND "photos"."context_id" IN (6)
Rendered shared/_feedback.html.haml (1.3ms)
  Role Load (0.4ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
  CACHE (0.0ms)  SELECT "profiles".* FROM "profiles" WHERE ("profiles".user_id = 1) LIMIT 1
  CACHE (0.0ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
Rendered shared/_menu.html.haml (35.5ms)
Rendered shared/_footer.html.haml (2.9ms)
Rendered photos/index.html.haml within layouts/application (729.3ms)
Completed 200 OK in 990ms (Views: 728.5ms | ActiveRecord: 7.7ms)

对于搜索的第二页（即使结果存在，也不显示结果）：

Started GET "/photos?commit=Search&page=2&search[context_id_in][]=6&search[near][]=&search[near][]=100&search[tagged_with]=&search[text_contains]=&utf8=%E2%9C%93" for 127.0.0.1 at 2011-04-28 12:01:33 -0500
  Processing by PhotosController#index as HTML
  Parameters: {"commit"=>"Search", "page"=>"2", "search"=>{"context_id_in"=>["6"], "near"=>["", "100"], "tagged_with"=>"", "text_contains"=>""}, "utf8"=>"✓"}
  SQL (0.4ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'

  SQL (0.3ms)   SELECT name
 FROM sqlite_master
 WHERE type = 'table' AND NOT name = 'sqlite_sequence'
  User Load (0.7ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Context Load (0.3ms)  SELECT "contexts".* FROM "contexts" ORDER BY "contexts"."display_order" ASC
  Focus Load (0.3ms)  SELECT "focus".* FROM "focus" ORDER BY "focus"."display_order" ASC
  LandUse Load (0.3ms)  SELECT "land_uses".* FROM "land_uses" ORDER BY "land_uses"."display_order" ASC
Rendered static/_help-context.html.haml (4.9ms)
Rendered static/_help-focus.html.haml (3.4ms)
Rendered photos/_search.html.haml (307.8ms)
  SQL (0.3ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL AND "photos"."context_id" IN (6) LIMIT 1 OFFSET 1
  SQL (0.3ms)  SELECT COUNT(DISTINCT "photos"."id") FROM "photos" LEFT OUTER JOIN "attachments" ON "attachments"."photo_id" = "photos"."id" LEFT OUTER JOIN "collections" ON "collections"."id" = "photos"."collection_id" WHERE "photos"."collection_id" IS NULL AND "photos"."context_id" IN (6)
Rendered shared/_feedback.html.haml (1.5ms)
  Role Load (0.4ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
  Profile Load (1.6ms)  SELECT "profiles".* FROM "profiles" WHERE ("profiles".user_id = 1) LIMIT 1
  CACHE (0.0ms)  SELECT "roles".* FROM "roles" INNER JOIN "roles_users" ON "roles".id = "roles_users".role_id WHERE "roles"."name" = 'admin' AND ("roles_users".user_id = 1 ) LIMIT 1
Rendered shared/_menu.html.haml (209.5ms)
Rendered shared/_footer.html.haml (2.7ms)
Rendered photos/index.html.haml within layouts/application (822.3ms)
Completed 200 OK in 934ms (Views: 823.7ms | ActiveRecord: 5.1ms)

再次注意，在上面的日志中，我已将分页设置为每页 1，这样我就可以查看分页器是否显示了正确的结果数量，事实确实如此。例如，如果我搜索我知道的内容，每页有 3 个匹配项，分页器会显示有三页结果，但第 2 页和第 3 页是空白的。

我完全被难住了，任何帮助将不胜感激。

Answer 1

尝试添加您的范围作为搜索方法。

class Photo < ActiveRecord::Base
  scope :community, where(:collection_id => nil)
  search_methods :community
end

class PhotosController < ActiveRecord::Base
  def index
    params[:search][:community] => true
    @search = Photo.search(params[:search])
    @photos = @search.page(params[:page]).per(20)
  end
end

我自己不使用 kaminari，所以我不能肯定地说，但我知道 MetaSearch 文档说使用 search_methods 以便在搜索中使用范围。

Answer 2

它适用于我当前最新的 gems（meta_search 1.0.4，kaminari 0.12.4）。

作为 Kaminari gem 的作者，我认为某些旧版本的 Kaminari 可能无法与 meta_search 一起使用。我实际上修复了几个可能导致此类问题的错误。

那么，您可以升级您的 Kaminari 宝石并重试吗？