nEDM Interface

Filter functions in nEDM

Filters are used for filtering results in changes feed functions. This means that the server will only ship information that passes the filter.

_design/nedm_default

doc_type

This filter only passes documents of a certain type or within a certain set. Query parameters that may be sent to this filter are:

• handle_delete - true (will pass documents that have been deleted) or false (will not)

• type - either string or array of strings of types of documents to pass

• Example usage: this is used on the measurements site page to selectively listen for new measurements arriving: see here

_design/execute_commands

execute_commands

This filter passes command documents (e.g. "type" = "command"). It takes as a query parameter:

• only_commands - array of strings of command keys to pass

This is essential for pynedm listeners that are only listening for a select set of commands.

• Example usage: this is used in pynedm to listen for particular commands arriving, see here