We use the following protocol to work with the storage

     query: {},
     doc: {},
     docs: [],
     limit: 10,
     fields: {},
     sort: {},
     skip: 0     

query - object to form selection criteria

doc - object to update a document

docs - array of objects to create documents

limit - parameter setting a limit for chosen documents

fields - object describing what fields will be chosen in the document

sort - object describing rules of sorting

skip - parameter setting the margin for selection