回答編集履歴
1
source: :attacklistsではなく正しくは単数形のattacklistでした
test
CHANGED
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@@ -14,7 +14,7 @@
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has_many :attacklist_hq_contract_bases, dependent: :destroy
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-
has_many :attackings, through: :attacklist_hq_contract_bases, source: :attacklist
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+
has_many :attackings, through: :attacklist_hq_contract_bases, source: :attacklist
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