# Return `self`.
#
# ```
- # var query = (new CypherQuery).nmatch("(n)").nwhere(
- # "n.key = key").set("key", "foo")
+ # var query = (new CypherQuery).
+ # nmatch("(n)").
+ # nwhere("n.key = \{key\}").
+ # set("key", "foo")
#
# assert query.params["key"] == "foo"
# ```