質問編集履歴
2
追加
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```SQL
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SELECT "affiliations".* FROM "affiliations" INNER JOIN "branches" ON "affiliations"."id" = "branches"."affiliation_id" WHERE "affiliations"."deleted_at" IS NULL AND "branches"."order_id" = $1 LIMIT $2 [["order_id", 8161], ["LIMIT", 1]]
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```
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## 試してこと
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このように中間テーブルから辿ると表示することができました。
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```ruby
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<%= order.branch&.affiliation&.name %>
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```
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test
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@@ -1,11 +1,65 @@
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viewでaffiliationがnilになります。
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リレーションの貼り方が間違っていますか？
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```ruby
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# index.html.slim
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<%= order.affiliation.name %>
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```
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## order.affiliationで発行されるSQL
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```SQL
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SELECT "affiliations".* FROM "affiliations" INNER JOIN "branches" ON "affiliations"."id" = "branches"."affiliation_id" WHERE "affiliations"."deleted_at" IS NULL AND "branches"."order_id" = $1 LIMIT $2 [["order_id", 8161], ["LIMIT", 1]]
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```
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# リレーション
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```ruby
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class Order < ApplicationRecord
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has_one :
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has_one :branch, dependent: :destroy
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has_one :affiliation, through: :
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has_one :affiliation, through: :branch
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end
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```
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```ruby
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class Branch < ApplicationRecord
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belongs_to :order
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belongs_to :affiliation
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end
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```
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```ruby
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class Affiliation < ApplicationRecord
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has_many :branches, dependent: :destroy
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has_many :orders, through: :branches
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end
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```
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