make unique custom url for polls
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@ -29,7 +29,7 @@ class Poll {
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*/
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public $title;
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/**
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* @ORM\Column(type="string", length=255, nullable=true)
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* @ORM\Column(type="string", length=255, nullable=false, unique=true)
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* @Serializer\Expose()
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* @Serializer\Type("string")
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*/
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