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PORails 3 using select distinct
primarykey
Id
15032523
data
AcceptedAnswerId
0
AnswerCount
4
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CommentCount
0
CommunityOwnedDate
CreationDate
2013-02-22T20:18:37.007
FavoriteCount
2
LastActivityDate
2013-02-23T12:24:16.917
LastEditDate
2013-02-23T08:46:32.993
LastEditorUserId
116522
OwnerUserId
116522
ParentId
0
PostTypeId
1
Score
1
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6691
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text
Body
I have 3 tables I need to join together. I have <code>Events</code>, <code>Places</code>, and <code>Boroughs</code> Places belong to a Borough and have many Events From a list of events on a given day, I would like to retrieve a list of all the distinct boroughs. <pre><code>Event.where(day_of_week: 2).joins(:place,:borough).select("DISTINCT(boroughs.name) AS name") </code></pre> Generating the SQL: <pre><code>SELECT DISTINCT(boroughs.name) AS name FROM "events" INNER JOIN "places" ON "places"."id" = "events"."place_id" INNER JOIN "places" "places_events_join" ON "places_events_join"."id" = "events"."place_id" INNER JOIN "boroughs" ON "boroughs"."id" = "places_events_join"."borough_id" WHERE "events"."active" = 't' AND "events"."day_of_week" = 3 </code></pre> Which looks perfect and works when I throw it into my postgres DB console, however for my rails console I get. <pre><code>#<Event >, #<Event >, #<Event >, #<Event >, #<Event >, #<Event >, #<Event >, #<Event >, #<Event >, #<Event > </code></pre> UPDATE: Mr.The Walrus' suggestion works perfectly, but I'm still confused why going the other way around doesn't work when the SQL itself produces the same result. <pre><code>Borough.joins(:events).where(:events => {:day_of_week => 2}).select("DISTINCT(boroughs.name) AS name") </code></pre> Produces: <pre><code>[#<Borough name: "richmond">, #<Borough name: "southwark">, #<Borough name: "brent">, #<Borough name: "city of london">] </code></pre> But this <pre><code>Event.where(:events => {:day_of_week => 2}).joins(:borough).select("DISTINCT(boroughs.name) AS name") </code></pre> Produces: <pre><code>[#<Event >, #<Event >, #<Event >, #<Event >, #<Event >] </code></pre>
Tags
<sql><ruby-on-rails><ruby-on-rails-3><select><distinct>
Title
Rails 3 using select distinct
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PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USholden
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1. USholden
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PostLinksPostIdRelatedPostId
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1. PO
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 PORails 3 using select distinct
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1. This table or related slice is empty.

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