我在为 Spree 2.0.4 定义新的动态 ProductFilters 时遇到问题
我的客户有类别（例如分类单元）。一个产品属于一个类别，最多有 8 个属性，但属性还取决于每个产品所在的类别，并且属性的位置也很重要。
我的解决方案是以非规范化的方式扩展数据库：
module Spree
Taxon.class_eval do
belongs_to :prop1, class_name: "Spree::Property",
foreign_key: "p1_id"
belongs_to :prop2, class_name: "Spree::Property",
foreign_key: "p2_id"
belongs_to :prop3, class_name: "Spree::Property",
foreign_key: "p3_id"
belongs_to :prop4, class_name: "Spree::Property",
foreign_key: "p4_id"
belongs_to :prop5, class_name: "Spree::Property",
foreign_key: "p5_id"
belongs_to :prop6, class_name: "Spree::Property",
foreign_key: "p6_id"
belongs_to :prop7, class_name: "Spree::Property",
foreign_key: "p7_id"
belongs_to :prop8, class_name: "Spree::Property",
foreign_key: "p8_id"
attr_accessible :prop1, :prop2, :prop3, :prop4, :prop5, :prop6, :prop7, :prop8
def properties
prop = []
prop << prop1
prop << prop2
prop << prop3
prop << prop4
prop << prop5
prop << prop6
prop << prop7
prop << prop8
return prop
end
def applicable_filters
fs = []
fs << Spree::Core::ProductFilters.price_filter if Spree::Core::ProductFilters.respond_to?(:price_filter)
#fs << Spree::Core::ProductFilters.brand_filter if Spree::Core::ProductFilters.respond_to?(:brand_filter)
fs
end
end
end
这样我就能够在相应产品的分类单元中获得可能的属性。我现在为每个分类属性（prop1 .. prop8）制作了 8 个过滤器，因为有些值是数字的，应该与文本值不同的处理方式，所以即使这不是完全干燥的，我也得出了以下解决方案：
module Spree
module Core
module ProductFilters
if Spree::Property.table_exists?
Spree::Product.add_search_scope :selective_prop1_any do |*opts|
conds = opts.map {|o| ProductFilters.selective_prop1_filter[:conds][o]}.reject {|c| c.nil?}
scope = conds.shift
conds.each do |new_scope|
scope = scope.or(new_scope)
end
Spree::Product.where(scope)
end
def ProductFilters.selective_prop1_filter(taxon = nil, locale = 'en')
return if taxon.nil? #||= Spree::Taxon.find_by_permalink!("categories")
property = taxon.prop1
scope = Spree::ProductProperty.where(:property_id => property, :locale => locale).
joins(:product => :taxons).
where("#{Spree::Taxon.table_name}.id" => [taxon] + taxon.descendants).
scoped
brands = scope.pluck(:value).uniq
{
:name => property.presentation,
:scope => :selective_prop1_any,
:labels => brands.sort.map { |k| [k,k] }
}
end
end
if Spree::Property.table_exists?
Spree::Product.add_search_scope :selective_prop2_any do |*opts|
conds = opts.map {|o| ProductFilters.selective_prop2_filter[:conds][o]}.reject {|c| c.nil?}
Rails.logger.debug conds.inspect
scope = conds.shift
Rails.logger.debug scope.inspect
conds.each do |new_scope|
scope = scope.or(new_scope)
end
Rails.logger.debug scope.inspect
Spree::Product.where(scope)
end
# ... other filters cut out for brevity
if Spree::Property.table_exists?
Spree::Product.add_search_scope :selective_prop8_any do |*opts|
[..]
end
def ProductFilters.selective_prop8_filter(taxon = nil, locale = 'en')
[..]
end
end
Spree::Product.add_search_scope :price_range_any do |*opts|
conds = opts.map {|o| Spree::Core::ProductFilters.price_filter[:conds][o]}.reject {|c| c.nil?}
scope = conds.shift
conds.each do |new_scope|
scope = scope.or(new_scope)
end
Spree::Product.joins(:master => :default_price).where(scope)
end
def ProductFilters.format_price(amount)
Spree::Money.new(amount)
end
def ProductFilters.price_filter
v = Spree::Price.arel_table
conds = [ [ Spree.t(:under_price, :price => format_price(10)) , v[:amount].lteq(10)],
[ "#{format_price(10)} - #{format_price(15)}" , v[:amount].in(10..15)],
[ "#{format_price(15)} - #{format_price(18)}" , v[:amount].in(15..18)],
[ "#{format_price(18)} - #{format_price(20)}" , v[:amount].in(18..20)],
[ Spree.t(:or_over_price, :price => format_price(20)) , v[:amount].gteq(20)]]
{ :name => Spree.t(:price_range),
:scope => :price_range_any,
:conds => Hash[*conds.flatten],
:labels => conds.map {|k,v| [k,k]}
}
end
end
end
end
由于这个事实，即使是属性的值也应该本地化，因此在 ProductProperties 表中创建了一个列区域设置。我的选择性过滤器通过语言环境变量来检索正确的 ProductProperty。
由于 MVC 限制无法将区域设置从 session[:locale] 和当前分类单元传递给模型，我覆盖了原始显示逻辑，该逻辑使用 CONTROLLER(!) 中分类单元的 apply_filters 方法，如下所示：
TaxonsController.class_eval do
def show
@taxon = Taxon.find_by_permalink(params[:id])
return unless @taxon
if @taxon
@filters = []
@filters << Spree::Core::ProductFilters.selective_prop1_filter(@taxon, locale) unless @taxon.prop1.nil?
[...]
@filters << Spree::Core::ProductFilters.selective_prop8_filter(@taxon, locale) unless @taxon.prop8.nil?
@filters.concat(@taxon.applicable_filters)
else
@filters = Spree::Core::ProductFilters.all_taxons
end
p = params.merge(:taxon => @taxon.id)
@searcher = Spree::Config.searcher_class.new(params)
@searcher.current_user = try_spree_current_user
@searcher.current_currency = current_currency
@products = @searcher.retrieve_products
end
end
这是主要留下的原始视图代码：
<% unless @filters.empty? %>
<%= form_tag '', :method => :get, :id => 'sidebar_products_search' do %>
<% params[:search] ||= {} %>
<%= hidden_field_tag 'per_page', params[:per_page] %>
<% @filters.each do |filter| %>
<% labels = filter[:labels] || filter[:conds].map {|m,c| [m,m]} %>
<% next if labels.empty? %>
<div class="" data-hook="navigation">
<h5 class="filter-title"> <%= filter[:name] %> </h5>
<% labels.each do |nm,val| %>
<% label = "#{filter[:name]}_#{nm}".gsub(/\s+/,'_') %>
<label for="<%= label %>" class="checkbox" style="display:block;"><%= nm %><input type="checkbox"
id="<%= label %>"
name="search[<%= filter[:scope].to_s %>][]"
value="<%= val %>"
<%= params[:search][filter[:scope]] && params[:search][filter[:scope]].include?(val.to_s) ? "checked" : "" %> />
</label>
<% end %>
</div>
<% end %>
<%= submit_tag Spree.t(:search), :name => nil, :class => 'button' %>
<% end %>
<% end %>
显示的工作原理如下：根据用户所在的分类单元，会话 [:locale] 中 ProductProperties 的值被正确获取并显示，但现在出现了问题：
搜索不再起作用。即使未修改的 :price_range_any 过滤器也不起作用。始终显示属于当前分类单元的所有产品。params hash 中的搜索散列由以下形式正确构建search => {"price_range_any":["10.00 € EUR - 15.00 € EUR"]}
我不知道。如果我通过删除覆盖切换回原始文件，一切正常。
如何让我的过滤器正常运行？