@classmethod
def enrich_fields(cls, fields, eitem):
    """Enrich the fields property of an issue.

        Loops through al properties in issue['fields'],
        using those that are relevant to enrich eitem with new properties.
        Those properties are user defined, depending on options
        configured in Jira. For example, if SCRUM is activated,
        we have a field named "Story Points".

        :param fields: fields property of an issue
        :param eitem: enriched item, which will be modified adding more properties
        """
    for field in fields:
        if field.startswith('customfield_'):
            if type(fields[field]) is dict:
                if 'name' in fields[field]:
                    if fields[field]['name'] == 'Story Points':
                        eitem['story_points'] = fields[field]['value']
                    elif fields[field]['name'] == 'Sprint':
                        value = fields[field]['value']
                        if value:
                            sprint = value[0].partition(',name=')[2].split(','
                                )[0]
                            sprint_start = value[0].partition(',startDate=')[2
                                ].split(',')[0]
                            sprint_end = value[0].partition(',endDate=')[2
                                ].split(',')[0]
                            sprint_complete = value[0].partition(
                                ',completeDate=')[2].split(',')[0]
                            eitem['sprint'] = sprint
                            eitem['sprint_start'] = cls.fix_value_null(
                                sprint_start)
                            eitem['sprint_end'] = cls.fix_value_null(sprint_end
                                )
                            eitem['sprint_complete'] = cls.fix_value_null(
                                sprint_complete)
