通过思考狮身人面像的浮动字段进行搜索和排序

I'm using thinking sphinx to for search on a rails app. I have a float field called 'height'. I need to be able to search this field for exact values (i.e. exactly 6.0, not 6.5). I also need to be able to sort on the field.I'm using thinking sphinx to for search on a ra