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    Link fields

    Suppose our blog_post model has the following fields:

    • author: Single link referencing a user record;
    • related_posts: Multiple links referencing other blog_post records;

    In this case, blog_post.author will return the linked user record (or nil, if the relation is empty), and blog_post.related will return an array of blog_post records.

    blog_post.author.full_name # => "Mark Smith"
    blog_post.related.each do |related_post|
    related_post.title # => "Another post!"
    end

    Use method chains to navigate deep across your records' relationships:

    blog_post.related.first.author.name # => "Tom Kepler"

    Reverse lookups

    You can easily find all the blog post for a specific author with this Ruby one-liner:

    peter = dato.find("1413")
    dato.blog_posts.select { |blog_post| blog_post.author == peter }