method

with_recursive

v7.2.3 - Show latest stable - 0 notes - Class: ActiveRecord::QueryMethods

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What's this?

with_recursive(*args) public

Add a recursive Common Table Expression (CTE) that you can then reference within another SELECT statement.

Post.with_recursive(post_and_replies: [Post.where(id: 42), Post.joins('JOIN post_and_replies ON posts.in_reply_to_id = post_and_replies.id')])
# => ActiveRecord::Relation
# WITH post_and_replies AS (
#   (SELECT * FROM posts WHERE id = 42)
#   UNION ALL
#   (SELECT * FROM posts JOIN post_and_replies ON posts.in_reply_to_id = post_and_replies.id)
# )
# SELECT * FROM posts

See `#with` for more information.

Show source

# File activerecord/lib/active_record/relation/query_methods.rb, line 511
    def with_recursive(*args)
      check_if_method_has_arguments!(__callee__, args)
      spawn.with_recursive!(*args)
    end

with_recursive

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