happi.backends.json_db.JSONBackend

class happi.backends.json_db.JSONBackend(path, initialize=False)

JSON database

The happi information is kept in a single dictionary large dictionary that is stored using simplejson

Parameters

• path (str) – Path to JSON file

• initialze (bool, optional) – Initialize a new empty JSON file to begin filling

__init__(path, initialize=False)

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__(path[, initialize])	Initialize self.
delete(_id)	Delete a device instance from the database
find(to_match)	Find an instance or instances that matches the search criteria
find_range(key, *, start[, stop])	Find an instance or instances that matches the search criteria, such that start <= entry[key] < stop.
find_regex(to_match, *[, flags])	Find an instance or instances that matches the search criteria, using regular expressions.
get_by_id(id_)	Get a device by ID if it exists, or None
initialize()	Initialize a new JSON file database
load()	Load the JSON database
save(_id, post[, insert])	Save information to the database
store(db)	Stache the database back into JSON

Attributes

all_devices

All of the devices in the database