python - Group by column to get array results in Postgresql -


i have table called moviegenre looks like:

moviegenre: - movie (fk movie.id) - genre (fk genre.id)

i have query (orm generated) returns movie.imdb , genre.id's have genre.id's in common given movie.imdb_id.

select "movie"."imdb_id",         "moviegenre"."genre_id"    "moviegenre"         inner join "movie"                 on ( "moviegenre"."movie_id" = "movie"."id" )   ( "movie"."imdb_id" in (select u0."imdb_id"                                   "movie" u0                                        inner join "moviegenre" u1                                                on ( u0."id" = u1."movie_id" )                                  ( u0."last_ingested_on" not null                                          , not ( u0."imdb_id" in                                                    ( 'tt0169547' ) )                                          , not ( u0."imdb_id" in                                                    ( 'tt0169547' ) )                                          , u1."genre_id" in ( 2, 10 ) ))           , "moviegenre"."genre_id" in ( 2, 10 ) )

the problem i'll results in format:

[   ('imdbid22`, 'genreid1'),   ('imdbid22`, 'genreid2'),   ('imdbid44`, 'genreid1'),   ('imdbid55`, 'genreid8'), ]

is there way within query can group of genre ids list under movie.imdb_id's? i'd grouping in query.
doing in web app code (python) extremely slow when 50k+ rows returned.

[   ('imdbid22`, ['genreid1', 'genreid2']),   ('imdbid44`, 'genreid1'),   ('imdbid55`, 'genreid8'), ]

thanks in advance!

edit:

here's python code runs against current results

results_list = []

for item in movies_and_genres:     genres_in_common = len(set([         i['genre__id'] in movies_and_genres         if i['movie__imdb_id'] == item['movie__imdb_id']     ]))     imdb_id = item['movie__imdb_id']      if genres_in_common >= min_in_comon:         result_item = {             'movie.imdb_id': imdb_id,             'count': genres_in_common         }         if result_item not in results_list:             results_list.append(result_item)  return results_list 

select m.imdb_id, array_agg(g.genre_id) genre_id     moviegenre g     inner join      movie m on g.movie_id = m.id      m.last_ingested_on not null      , not m.imdb_id in ('tt0169547')       , not m.imdb_id in ('tt0169547')     , g.genre_id in (2, 10)  group m.imdb_id

array_agg create array of genre_ids of imdb_id:

http://www.postgresql.org/docs/current/interactive/functions-aggregate.html#functions-aggregate-table


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