ruby - Rails with angular - null value change to 0 -

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when update field null value, 0 appear. db: postgres

angular put request 

------webkitformboundarygqglt12slbc759gb content-disposition: form-data; name="product[gender]" null

the field:

:gender, 'integer using cast(gender integer)', {default: nil, null: true}

result: db postgres field


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