Rails 如何制作过滤器 link

Question

我正在 rails 中进行分面搜索。它来自我之前的问题：Rails: How to use facets with search results

我能做的是使用范围来获取与搜索结果相关的所有方面，如图所示：

我目前正在做的是使用 facets 文本作为 link 来为我们已经得到的搜索结果添加额外的参数。

关于这个我有两个问题：

How to take existing search URL and add a link to add/merge params when a link is clicked. I am using params merge which is not working. The code is as below.

    <h3 style = "color:#7C064D; text-align: center;"><strong>CYLINDER</strong></h3>

    <%- @listings_cylinder.each do |key, value| -%>
        <h5 style = "color:#F00000; text-align: left;"><strong><%= link_to "#{key.upcase if key} (#{value})" , search_listings_path(params.merge(:cylinder => "#{key}")) %> </strong></h5>
    <% end %>

How to use multiple filters at the same time. What I want is when a facet link is clicked, it should add a small filter link below the sorting link in the pic. When a user wants to undo that facet filter effect, he clicks the X on that small link and he gets to the search query without the filter. The same what happens on hotels.com or priceline.com as shown:

注意： 我不想使用 solr/elaticsearch 因为它不是这里的最佳用例。我想从头学起。我已经能够使用简单的 rails 构建构面文本。有一点帮助，我就能做到。

代码：

我正在使用的范围：

    scope :listing_search_cities, -> {group(:city).count}
    scope :listing_search_body_type, -> {group(:bodytype).count}
    scope :listing_search_states, -> {group(:state).count}
    scope :listing_search_newused, -> {group(:NewUsed).count}
    scope :listing_search_transmission, -> {group(:transmission).count}
    scope :listing_search_cylinder, -> {group(:cylinder).count}
    scope :listing_search_fuel, -> {group(:fuel).count}
    scope :listing_search_drive, -> {group(:drive).count}
    scope :listing_search_trim, -> {group(:trim).count}
    scope :listing_search_color, -> {group(:color).count}
    scope :listing_search_year, -> {group(:year).count}
    scope :listing_search_interiorcolor, -> {group(:interiorcolor).count}

在控制器搜索操作中，我使用：

def search                  
    @listings = Listing.search(params)  
    @listings_cities = @listings.listing_search_cities  
    @listings_bodytype = @listings.listing_search_body_type
    @listings_states = @listings.listing_search_states

    @listings_newused = @listings.listing_search_newused
    @listings_cylinder = @listings.listing_search_cylinder
    @listings_transmission = @listings.listing_search_transmission
    @listings_drive = @listings.listing_search_drive
    @listings_trim = @listings.listing_search_trim

    @listings_fuel = @listings.listing_search_fuel

    @listings_color = @listings.listing_search_color
    @listings_interiorcolor = @listings.listing_search_interiorcolor
    @listings_year = @listings.listing_search_year

end

在视图中，我通过这样的键值使用迭代：

<%- @listings_cylinder.each do |key, value| -%>
            <h5 style = "color:#F00000; text-align: left;"><strong><%= link_to "#{key.upcase if key} (#{value})" , search_listings_path(params.merge(:cylinder => "#{key}")) %> </strong></h5>
<% end %>

Answer 1

不是解决方案，而是一些想法（未测试）：

将所有过滤器传递给参数散列中的搜索方法（例如 params[:filters]）。

定义一个包含所有过滤器的实例变量，并将其加载到控制器的搜索方法中。

根据过滤器过滤列表。

def search
  @current_filters = params[:filters]
  @listings = Listing.all
  @listings = @listings.where(:cylinder => @current_filters[:cylinder]) if @current_filters[:cylinder]
  @listings = @listings.where(:fuel => @current_filters[:fuel]) if @current_filters[:fuel]
  #etc
end

在视图中：

<% @listings_cylinder.each do |key, value| %>
  <h5><%= link_to "#{key.upcase if key} (#{value})", search_listings_path(filters: @current_filters.merge(:cylinder => "#{key}")) %>
  </h5>
<% end %>

在视图中，当显示当前过滤器时：

Applied filters: 
<ul>
  <% @current_filters.each do |key, value| %>
    <li><%= link_to value, search_listings_path(filters: @current_filters.except(key)) %>
    </li>
  <% end %>
</ul>

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