Cannot retrieve group members in pg

[NanoMeko]

[30] pry(main)> g.members.count (0.7ms) SELECT DISTINCT COUNT(DISTINCT "users"."id") FROM "users" INNER JOIN "group_memberships" ON "users"."id" = "group_memberships"."member_id" WHERE "group_memberships"."group_id" = $1 AND "group_memberships"."group_type" = $2 AND "group_memberships"."member_type" = $3 [["group_id", 4], ["group_type", "Group"], ["member_type", "User"]] => 1

so far so good.

[31] pry(main)> g.members.first ActiveRecord::StatementInvalid: PG::UndefinedFunction: ERROR: could not identify an equality operator for type json LINE 1: SELECT DISTINCT "users".* FROM "users" INNER JOIN "group_me... ^ : SELECT DISTINCT "users".* FROM "users" INNER JOIN "group_memberships" ON "users"."id" = "group_memberships"."member_id" WHERE "group_memberships"."group_id" = $1 AND "group_memberships"."group_type" = $2 AND "group_memberships"."member_type" = $3 ORDER BY "users"."id" ASC LIMIT $4 from /Users/.../.gem/ruby/2.3.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/postgresql_adapter.rb:657:in `prepare' \

[drkmen]

Same here.

[dwbutler]

Seems to be a side-effect of how distinct works in ActiveRecord. See https://github.com/rails/rails/issues/17706

SELECT DISTINCT users.* won't work if there is a json column. The solution would be to switch to using SELECT DISTINCT ON (users.id) users.*

[kcollignon]

@dwbutler has there been any resolution for this?

[kcollignon]

@NanoMeko were you ever able to resolve this?

[NanoMeko]

Yeap, I decided to build my own group relationships with ActiveRecord 🤷🏽‍♂️

On Fri, 12 Jul 2019 at 08:56, Kevin Collignon [email protected] wrote:

@NanoMeko https://github.com/NanoMeko were you ever able to resolve this?

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