Hi!
This is useful aggregate function for PG-users (tested with PostgreSQL 9.3
):
def json_agg_sql(flds_lst, as_alias):
json_fld_sql = """ '"%s":' || to_json(%s) """
json_row = [json_fld_sql % (f.name, f.name) for f in flds_lst]
json_row_sql = "'{' || " + "|| ',' ||".join(json_row) + " || '}'"
json_agg_sql = 'json_agg((%s)::json) AS %s' % (json_row_sql,
as_alias)
return json_agg_sql
usage:
rows= db().select(db.table.*field, ...* , json_agg_sql([db.table.*field_1*,
db.table.*field_2*], as_alias='*your_alias*'), groupby=[db.table.*field,
...*] )
rows[0].table.*field* # - access to "group by" field
rows[0].*your_alias*[0] # - access to "json_agg" record
rows[0].*your_alias*[0]['*field_1*'] # - access to "json_agg" field
Note that it's possible to have more than one *json_agg* in one *select!*
just use different aliases
--
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