uniq relation
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				|  | @ -6,5 +6,6 @@ class CoAuthorRelation | ||||||
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|   has_and_belongs_to_many :co_authors |   has_and_belongs_to_many :co_authors | ||||||
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|   validates :relation, presence: true |   validates :relation, presence: true, | ||||||
|  |             uniqueness: { case_sensitive: false } | ||||||
| end | end | ||||||
|  |  | ||||||
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