質問編集履歴
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コード追記
test
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こういった場合、投稿をDBで直接削除するとまずいでしょうか？タグマップも消したほうがいいでしょうか？
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```tag.rb
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has_many :tag_maps, dependent: :destroy, foreign_key: 'tag_id'
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has_many :posts, through: :tag_maps
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```
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```tag_map.rb
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belongs_to :post
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belongs_to :tag
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validates :post_id,presence:true
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validates :tag_id,presence:true
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```
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```post.rb
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has_many :tag_maps, dependent: :destroy, foreign_key: 'post_id'
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has_many :tags, through: :tag_maps
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validates :title, :des, presence: true
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```
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