我有一个Deal模型和一个具有多对多映射的Category模型（has_many：through，因为我也保存了一些相关数据。）
此外，我还有一个城市模型，它也有多对多的交易模型映射（再次has_many通过）
类别模型与城市模型没有关系。
现在根据关键字搜索交易（关键字意味着，我已将某些列编入索引，如交易标题，描述等）
@deals = Deal.search(params[:keywords],:per_page => 20, :page => params[:page])
问题是：
现在我需要根据类别对这些交易进行分组，基本上第一类有4笔交易，第二类有7笔交易，等等提供给city_id。
@deals = @city.deals.search(params[:keywords],:per_page => 20, :page => params[:page])
PS： 你可以想到这样的事情： 最终用户将输入选择伦敦作为位置，然后输入“fun”作为关键字然后我需要搜索数据库以检查具有“fun”关键字的伦敦交易并根据各种类别对它们进行分组。 我希望我能够解释这个问题。
修改
索引的一些问题： rake thinking_sphinx：rebuild --trace **调用thinking_sphinx：rebuild（first_time） **调用thinking_sphinx：app_env（first_time） **执行thinking_sphinx：app_env **执行thinking_sphinx：rebuild **调用thinking_sphinx：index（first_time） **调用thinking_sphinx：app_env **执行thinking_sphinx：index 生成配置到/Users/me/projects/deals/config/development.sphinx.conf 耙子流产了！
Cannot automatically map attribute category_ids in Deal to an
equivalent Sphinx type (integer, float, boolean, datetime, string as ordinal).
You could try to explicitly convert the column's value in your define_index
block:
has "CAST(column AS INT)", :type => :integer, :as => :column
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/attribute.rb:334:in `translated_type_from_database'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/attribute.rb:170:in `type'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/attribute.rb:139:in `include_as_association?'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/attribute.rb:107:in `to_select_sql'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source/sql.rb:69:in `block in sql_select_clause'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source/sql.rb:69:in `collect'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source/sql.rb:69:in `sql_select_clause'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source/sql.rb:19:in `to_sql'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source.rb:117:in `set_source_sql'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/source.rb:51:in `to_riddle_for_core'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/index.rb:114:in `block in to_riddle_for_core'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/index.rb:113:in `each'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/index.rb:113:in `each_with_index'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/index.rb:113:in `to_riddle_for_core'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/index.rb:83:in `to_riddle'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/active_record.rb:245:in `block in to_riddle'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/active_record.rb:244:in `collect'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/active_record.rb:244:in `to_riddle'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/configuration.rb:164:in `block in generate'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/configuration.rb:161:in `each'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/configuration.rb:161:in `generate'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/configuration.rb:177:in `build'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/tasks.rb:78:in `block (2 levels) in <top (required)>'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/me/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/me/.rvm/gems/ruby-1.9.2-p290/gems/thinking-sphinx-2.0.5/lib/thinking_sphinx/tasks.rb:95:in `block (2 levels) in <top (required)>'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/me/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/Users/me/.rvm/gems/ruby-1.9.2-p290@global/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/Users/me/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `load'
/Users/me/.rvm/gems/ruby-1.9.2-p290/bin/rake:19:in `<main>'
Tasks: TOP => thinking_sphinx:index
答案 0 :(得分：1)
我认为你有像
这样的交易模型class Deal < ActiveRecord::Base
has_many :category_deals
has_many :categories, :through => :category_deals
has_many :city_deals
has_many :cities, :through => :city_deals
define_index do
indexes :name
has category_deals.category_id, :as => :category_ids
has city_deals.city_id, :as => :city_ids
end
end
所以你想按城市搜索并给出具有ASC顺序类别的给定城市的类别或类别（1,3,2）：
Deal.search(params[:keywords], :with => {:category_ids => [1,3,2], :city_ids => params[:city_id]}, :order => "category_ids ASC", :per_page => 20, :page => params[:page])
答案 1 :(得分：0)
我不完全确定你追求的是什么 - 但是让我们澄清一些事情，特别是应该返回哪些结果，然后是结果的顺序。
首先，要将搜索结果限制在给定的城市，您需要将城市ID作为交易索引定义中的属性（说到哪个 - 如果您可以在交易中提供现有的define_index块，它将有所帮助）：
has cities.id, :as => :city_ids
然后，为了排序，听起来你想要按类别将搜索结果组合在一起 - 但这很棘手，因为交易可能属于多个类别。您不能按MVA属性排序（例如：给定交易的类别ID的集合）。那么你想从搜索结果中得到什么呢？