如何将Rapidminer连接到mongodb

Question

I converted a xml document to json and store it in mongodb (in java),there are ceveral Document nested in the json,then I connected rapidminer to the collection but when i visualise the content of the collection I one row and multiple columns. for example, i have this json :

{
     ' lat ' : 48.8566667,
     ' lng ' : 2.3509871  ,
     ' i '   : {
          ' id '       : ' id_element ' ,
          ' ville '    : ' Paris ',
          ' pays '     : ' France ',
          ' nbResult ' :  5
     }
 }

and when I visualte it with rapidminer (json to data) I get a table with one row and multiple columns, each column contains for example : lat or i.id, i.ville... i don't get the correct format.

Answer 1

I don't know rapidminer. But if it does not support a specialized view for nested objects, this is the common way, to display a nested document in a 2-dimensional table.

The nesting level is transformed to the dot . in the column name to show what attributes belong to the same nested document ( i.id , i.ville belong to i ). It's called flatten document , because the nested documents are reduced to first level attributes containing the information of the nesting in the attribute name.