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Editorial Team
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Asked: 2026-06-12T01:27:48+00:00

In my app, the main objects are Accounts and Phones, with a typical has_many

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In my app, the main objects are Accounts and Phones, with a typical has_many :through Contacts, eg:

Account:
has_many :contacts
has_many :phones, :though => contacts

Phone:
has_many :contacts
has_many :accounts, :though => :contacts

Contact:
belongs_to :account
belongs_to :phone

Contacts has fields signup_status, name
There is one Contact per unique Account/Phone pair

For an account with id = 123, which has 5 contacts, each contact having one phone, is there a query that would yield all 5 rows and include all the account fields AND contact fields AND phone fields?

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  1. Editorial Team

    You can use eager loading of associations to get all the data you need in one active record query

    @account = Account.includes(:contacts, :phones).find(123)

    , which will actually translate into three SQL queries:

    SELECT "accounts".* FROM "accounts" WHERE "accounts"."id" = $1 LIMIT 1  [["id", 123]]
SELECT "contacts".* FROM "contacts" WHERE "contacts"."account_id" IN (123)
SELECT "phones".* FROM "phones" WHERE "phones"."id" IN (<phone ids found in prev query>)

    All of the records will be loaded into memory and become available through @account. To get the array of contacts and phones, just call @account.contacts and @account.phones, respectively. Note that these calls will not result in re-issued SQL queries, which is the beauty of eager loading.

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