所以我一直在为一个问题苦苦挣扎一段时间，似乎无处可去......
当我在第 3 级左右循环遍历哈希时，问题就存在了。
所以我的代码看起来有点像：
request[:items][:location_item].each do |locaton_item|
pp location_item[:name]
location_item[:items][:sub_area_option_item].each do |sub_area_option_item|
pp sub_area_option_item[:name]
sub_area_option_item[:items][:option_item].each do |option_item|
option_item[:name] <- THIS IS WHERE MY CODE BREAKS
end
end
end
失败的原因是因为循环的这个特定部分有 2 个不同的变体，一个有无限数量的“option_item”，一个只有一个“option_item”。它不是将单个“option_item”发回给我，而是通过这个“option_item”循环而不是找到这个特定的字段。当只找到一个对象仍将其作为数组返回时如何强制它的任何想法？
更新(05/092012)
TypeError - 符号作为数组索引
如果我从哈希中删除单个“option_item”，甚至使用条件语句对其进行过滤，则不会出现此错误。
作为之前作为示例的另一个更新，这里是代码：
request[:items][:house_option_item][:items][:location_option_item].each do |location_option_item|
pp location_option_item.try(:[], :location).try(:[], :name)
# pp location_option_item[:location][:name]
location_option_item[:items][:sub_area_option_item].each do |sub_area_option_item|
pp "--" + sub_area_option_item[:sub_area][:name] + "--" + sub_area_option_item[:sub_area][:id]
count = 0
# pp sub_area_option_item[:items].length
# pp "+++++++++++++++++"
# if sub_area_option_item[:sub_area][:name] != "Conservatory"
[sub_area_option_item[:items][:option_item]].each do |option_item_key_info|
pp "----"
pp option_item_key_info[:usage_name]
end
# end
end
end
示例数据（略）：
{:"@xmlns:i"=>"http://www.w3.org/2001/XMLSchema-instance",
:"@xmlns:a"=>"http://schemas.datacontract.org/2004/07/RXTypes",
:items=>
{:house_option_item=>
{:design=>
{:house_style=>nil,
:sales_name=>nil,
:sq_ft=>"0",
:"@xmlns:b"=>"http://schemas.datacontract.org/2004/07/",
:arch_ref=>"D3H102.1",
:marketing_name=>"Warwick",
:num_beds=>"0"},
:items=>
{:location_option_item=>
[{:location=>{:sort_order=>"0", :name=>"Eat", :id=>"1"},
:items=>
{:sub_area_option_item=>
[{:sub_area=>
{:location_id=>"7",
:sort_order=>"0",
:name=>"Conservatory",
:id=>"31"},
:items=>
{:option_item=>
{:lead_days=>"0",
:collection_code=>"NEWHE01",
:usage_name=>"Conservatory",
:max_qty=>"1",
:is_a_bundle=>false,
:only_order_bundle=>false,
:sub_area=>"Conservatory",
:key_info=>
{:specification=>
"PVC-U 'Edwardian' style Conservatory in white with high performance toughened glass double glazed windows and 600mm (approx) dwarf base wall internally and externally. Conservatory to include fan and light, electric heater, double power point and ceramc floor tiling selected from tile choice . Size of Conservatory to be as follows: 3.2 x 3.1 metre (Availabil
ity will be subject to ground levels/conditions)",
:description=>"Conservatory",
:image_url=>"/2012/8/10/334_web.jpg",
:item_id=>"3",
:thumbnail_url=>"/2012/8/10/334_thumb.jpg"},
:build_stage_id=>"0",
:location=>"Building",
:option_flag=>"67",
:bundle_items=>nil,
:price=>"8950",
:choice_items=>nil,
:spec_level=>"85"}}},
{:sub_area=>
{:location_id=>"7",
:sort_order=>"0",
:name=>"Doors",
:id=>"32"},
:items=>
{:option_item=>
[{:lead_days=>"0",
:collection_code=>"NEWHE01",
:usage_name=>"Front Door",
:max_qty=>"0",
:is_a_bundle=>false,
:only_order_bundle=>false,
:sub_area=>"Doors",
:key_info=>
{:specification=>
"GRP pre-finished door with patterned glass manufactured by IG. Style of door to be all as indicated on house plan, finished in solid colour externally & white finish internally. Frame to be UPVC. Please refer to the External Finishing schedule to confirm the external finish selected for each property. The paint finish to be one of the New Heritage Colours - Camouflage beige
- BS381 389, Dk camouflage desert sand - BS381 420, Wine Red - RAL 3005, Braemar - BS4800 - 14C35, Deep Brunswick Green - BS381 227 and White. Door complete with lever handle furniture, multi point lock system, sleeved letterplate, viewer and door chain in black japanned finish externally & chrome lever handle furniture internally.",
:description=>"GRP Front door",
:image_url=>nil,
:item_id=>"4",
:thumbnail_url=>nil},
:build_stage_id=>"0",
:location=>"Building",
:option_flag=>"88",
:bundle_items=>nil,
:price=>"0",
:choice_items=>
{:option_item_key_info=>
[{:specification=>nil,
:description=>"NG42 Diamond",
:image_url=>"/2012/8/21/485_web.jpg",
:item_id=>"211",
:thumbnail_url=>"/2012/8/21/485_thumb.jpg"},
{:specification=>nil,
:description=>"NG21 Square",
:image_url=>"/2012/8/21/486_web.jpg",
:item_id=>"212",
:thumbnail_url=>"/2012/8/21/486_thumb.jpg"},
{:specification=>nil,
:description=>"NG51 Square",
:image_url=>"/2012/8/21/487_web.jpg",
:item_id=>"213",
:thumbnail_url=>"/2012/8/21/487_thumb.jpg"},
{:specification=>nil,
:description=>"NG42 Rectangle",
:image_url=>"/2012/8/21/488_web.jpg",
:item_id=>"214",
:thumbnail_url=>"/2012/8/21/488_thumb.jpg"}]},
:spec_level=>"83"},
{:lead_days=>"0",
:collection_code=>"NEWHE01",
:usage_name=>"Front Door",
:max_qty=>"0",
:is_a_bundle=>false,
:only_order_bundle=>false,
:sub_area=>"Doors",
:key_info=>
{:specification=>
"GRP pre-finished door with patterned glass manufactured by IG. Style of door to be all as indicated on house plan, finished in solid colour externally & white finish internally. Frame to be UPVC. Please refer to the External Finishing schedule to confirm the external finish selected for each property. The paint finish to be one of the New Heritage Colours - Camouflage beige
- BS381 389, Dk camouflage desert sand - BS381 420, Wine Red - RAL 3005, Braemar - BS4800 - 14C35, Deep Brunswick Green - BS381 227 and White. Door complete with lever handle furniture, multi point lock system, sleeved letterplate, viewer and door chain in black japanned finish externally & chrome lever handle furniture internally.",
:description=>"GRP Front door",
:image_url=>nil,
:item_id=>"4",
:thumbnail_url=>nil},
:build_stage_id=>"0",
:location=>"Building",
:option_flag=>"88",
:bundle_items=>nil,
:price=>"0",
:choice_items=>
{:option_item_key_info=>
[{:specification=>nil,
:description=>"NG42 Diamond",
:image_url=>"/2012/8/21/485_web.jpg",
:item_id=>"211",
:thumbnail_url=>"/2012/8/21/485_thumb.jpg"},
{:specification=>nil,
:description=>"NG21 Square",
:image_url=>"/2012/8/21/486_web.jpg",
:item_id=>"212",
:thumbnail_url=>"/2012/8/21/486_thumb.jpg"},
{:specification=>nil,
:description=>"NG51 Square",
:image_url=>"/2012/8/21/487_web.jpg",
:item_id=>"213",
:thumbnail_url=>"/2012/8/21/487_thumb.jpg"},
{:specification=>nil,
:description=>"NG42 Rectangle",
:image_url=>"/2012/8/21/488_web.jpg",
:item_id=>"214",
:thumbnail_url=>"/2012/8/21/488_thumb.jpg"}]},
:spec_level=>"83"},
{:lead_days=>"0",
:collection_code=>"NEWHE01",
:usage_name=>"Front Door",
:max_qty=>"0",
:is_a_bundle=>false,
:only_order_bundle=>false,
:sub_area=>"Doors",
:key_info=>
{:specification=>
"GRP pre-finished door with patterned glass manufactured by IG. Style of door to be all as indicated on house plan, finished in solid colour externally & white finish internally. Frame to be UPVC. Please refer to the External Finishing schedule to confirm the external finish selected for each property. The paint finish to be one of the New Heritage Colours - Camouflage beige
- BS381 389, Dk camouflage desert sand - BS381 420, Wine Red - RAL 3005, Braemar - BS4800 - 14C35, Deep Brunswick Green - BS381 227 and White. Door complete with lever handle furniture, multi point lock system, sleeved letterplate, viewer and door chain in black japanned finish externally & chrome lever handle furniture internally.",
:description=>"GRP Front door",
:image_url=>nil,
:item_id=>"4",
:thumbnail_url=>nil},
:build_stage_id=>"0",
:location=>"Building",
:option_flag=>"88",
:bundle_items=>nil,
:price=>"0",
:choice_items=>
{:option_item_key_info=>
[{:specification=>nil,
:description=>"NG42 Diamond",
:image_url=>"/2012/8/21/485_web.jpg",
:item_id=>"211",
:thumbnail_url=>"/2012/8/21/485_thumb.jpg"},
{:specification=>nil,
:description=>"NG21 Square",
:image_url=>"/2012/8/21/486_web.jpg",
:item_id=>"212",
:thumbnail_url=>"/2012/8/21/486_thumb.jpg"},
{:specification=>nil,
:description=>"NG51 Square",
:image_url=>"/2012/8/21/487_web.jpg",
:item_id=>"213",
:thumbnail_url=>"/2012/8/21/487_thumb.jpg"},
{:specification=>nil,
:description=>"NG42 Rectangle",
:image_url=>"/2012/8/21/488_web.jpg",
:item_id=>"214",
:thumbnail_url=>"/2012/8/21/488_thumb.jpg"}]},
:spec_level=>"83"},