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Merge pull request #19153 from stephenminded/docs_fix_polymorphic_index
[docs fix] Indexing a polymorphic assoc adds index on type and id
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@ -460,7 +460,7 @@ class CreatePictures < ActiveRecord::Migration
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t.timestamps null: false
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end
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add_index :pictures, :imageable_id
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add_index :pictures, [:imageable_id, :imageable_type]
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end
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end
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```
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