23 lines
802 B
Ruby
23 lines
802 B
Ruby
class CreateClaims < Prism::Orm::Migration
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def up
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create_table :claims do |t|
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t.integer :post_id
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t.integer :user_id
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t.datetime :deleted_at
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t.timestamps
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end
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# Belt and braces with Claim's own `validates :user_id, uniqueness:
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# { scope: :post_id }`: the model-level check only ever sees rows this
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# same process/transaction can already read, whereas this unique index
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# is enforced by Store#validate_unique_indexes inside the very same
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# transaction the insert itself runs in (see Store#insert), so it
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# still catches a duplicate claim even in the hypothetical case of two
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# inserts racing without going through Post#with_lock first.
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add_index :claims, %i[post_id user_id], unique: true
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end
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def down
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drop_table :claims
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end
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end
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