sql - Query for Joining Multiple Associations -


i managed make query joined table. wonder how add join table (e.g. publication_comments), count how many comments publication have, sum publication_comments_count reviews_count , order in desc order.

i have read rails guide , many example on stackoverflow, still need assist on syntax , how should gather pieces in 1 place. thanks.

@publication = publication.all(                           joins: :reviews,                           select: '"publications".*, count("reviews".id) reviews_count',                            group: '"publications".id',                           order: "reviews_count desc")

activerecord allows supply string joins method. can write raw sql join conditions:

publication.select("..., count(publication_comments.id) pub_count")  .join('join reviews on (..) join publication_comments')  .group('publications.id'

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