by Filter
Add a "filter" to the query. If this method is called several times, conditions are appended with AND connector.
For example,
.byFilter("uid1").eq("value1")
.byFilter("uid2").eq("value2")
means that the instance must have attribute "uid1" with value "value1" AND attribute "uid2" with value "value2".
Return
Repository connector
Parameters
attribute Id
Attribute uid to use in the filter