Replace a string in all posts

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You’d do it from rails, and it’ll be hard because posts don’t belong to categories, topics do. Sounds like you need a plugin if this is a continual issue. You could be clever with a join or just loop like

Topics.where(category_id: 123).each do |t|
  posts.where(topic_id: t, post_number: 1).each do |p|
    if p.raw.match("?")
        p.raw.gsub!("?","'")
        p.save
    end
  end
end

If it’s not only in post_number: , don’t include that.

If it’s not a huge number of posts, then this is probably good enough, if it works at all.

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