allow string searches to scan CHEBI synonyms

[proccaserra]

As per our email exchange:

libcheby.search() currently scan chebi 's chemical name attribute but seems to leave out 'has_related_synonym' attribute.

I am currently facing the following issue:
using the string "(E)-2-Hexenal" with libcheby.search(string, True) gives me back the element: CHEBI:132995 (E,E)-bilirubin anion

If using https://www.ebi.ac.uk/chebi/ search function with the string "(E)-2-Hexenal", the top hit is:
https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:28913, which what I am after.

thx!

another way to formulate the feature request: add another argument to libchebi.search(string,exact=boolean,synonym=boolean) so that if synonym argument is set to true, the synonym space is searched for exact matches on the input string.
aim: improve recall

[neilswainston]

Appears to be an issue with ols webservice:

https://www.ebi.ac.uk/ols/api/search?ontology=chebi&q=(E)-2-Hexenal&queryFields=label,synonym,annotations&rows=1000000

Does not return CHEBI:28913.

https://www.ebi.ac.uk/ols/api/ontologies/chebi/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCHEBI_28913