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USBruno Gabriel dos Santos
 

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  1. USBruno Gabriel dos Santos
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    1. POUsing aggregation in MongoDB to select two or more fields of a document
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    3. POUsing aggregation to sorting in complex conditional in Mongodb
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      1. USBruno Gabriel dos Santos
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    1. COThe problem is that you can not predict the filter that will be used, the user will choose. The application is written in Java, from this link: I am using the following schema: http://picpaste.com/filter-Sp50Bxm1.png An example of the code: http://pastebin.com/BhKgPpuv It is very important that the output iterator is this, I can not predict the JSON, depends on user input. May have 20 text fields, number etc.. I already have all pipelines ready to filter by date, sort text, regex etc., Lacking only GPS = / TKS
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      1. USBruno Gabriel dos Santos
    2. COMy thesis is about collective intelligence and i'm contributing to a open source project and i necessary to create a pipeline filter using gps. In my case it's necessary to make a lot of forms of visualization of data. But unfortunately haven't conditions to use simply 'find'. I was reading abount neo in this link http://docs.mongodb.org/manual/reference/aggregation/geoNear/ and it's contains: 'You can only use $geoNear as the first stage of a pipeline.'. But I don't know, how to use it. Can You help me? If I to use in get in the first pipeline would be very important for my thesys. Tks.
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      1. USBruno Gabriel dos Santos
    3. COI'm using various operations, my JSON can contain numeric data, gps, text, dates etc.. Then use gt, gte, match, etc. $ regex. Within. It's to filter data with specific conditions. Example of JSON: json1 = { location: [10.0, 12.3], thing: "pizza", prize: 12.99 } json2= { location: [9.0, -12.3], thing: "pizza", prize: 19.10 } json3= { location: [-5.0, 3.3], thing: "coffee", prize: 1.99 } I create filters like: locate establishments that have thing for pizza, $ match on pizza. Then sort them by price and end me the closest place. Understand?
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      1. USBruno Gabriel dos Santos
 

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