sql - ActiveRecord Join Query and select in Rails -


in rails 4 application, client (clients table) can have many projects (projects table). have column called name in each table. trying write join , select uses projects base table , clients lookup table. client_id foreign_key in projects table:

i writing query follows:

project.joins(:client).select('projects.id,projects.name,clients.name')

i following response:

project load (0.6ms)  select projects.id,projects.name,clients.name "projects" inner join "clients" on "clients"."id" = "projects"."client_id" => #<activerecord::relation [#<project id: 1, name: "fantastico client">]>

if try alias so:

project.joins(:client).select('projects.id,projects.name,clients.name client_name')

then following response:

project load (0.8ms)  select projects.id,projects.name,clients.name client_name "projects" inner join "clients" on "clients"."id" = "projects"."client_id" => #<activerecord::relation [#<project id: 1, name: "the dream project">]>

in either case, activerecord looses 1 of names can see above response. how should writing query?

if column in select not 1 of attributes of model on select called on columns not displayed. of these attributes still contained in objects within ar::relation , accessible other public instance attributes.

you verify calling first.client_name: 

project.joins(:client)        .select('projects.id,projects.name,clients.name client_name')        .first.client_name

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