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way to deep traverse a groovy object with dot in string using gpath


way to deep traverse a groovy object with dot in string using gpath  using -'grails,mongodb,groovy,gpath'

The situation I have is that I'm querying MongoDB with a string for a field that is more than one level deep in the object hierarchy.  This query must be a string.  So for example I'm querying for something like this in Groovy:

def queryField = 'a.b.c'  //this is variable and can be different every time
def result = mongodb.collection.findOne([queryField:5])


The problem no arises that in the result I want to find the value of the nested field.  With GPath I could go one level deep and get a's value doing this

def aObj = result."a"  //or result["a"]


However I want to go deeper than that by doing something like this:

def queryField = "a.b.c"       //this can change every time and is not always 'a.b.c'
def cObj = result[queryField]  //since field is variable, can't just assume result.a.b.c


This does not work in Groovy right now.  There is a bug logged here, but I was wondering if there is a better work around to use for this scenario that is a bit cleaner than me parsing the string by splitting on the dot and then building the object traversal.  Note that "a.b.c" is variable and unknown at runtime (e.g. it could be "a.b.d").  
    

asked Oct 6, 2015 by abhimca2006
0 votes
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