neo4j-bool-cast.rb

class Book
  include Neo4j::ActiveNode

  property :title
  has_many :in, :spaces, rel_class: :BookAuthor
end

class Author
  include Neo4j::ActiveNode

  property :first_name
  property :last_name

  has_many :out, :books, rel_class: :BookAuthor
end

class BookAuthor
  include Neo4j::ActiveRel

  from_class :Author
  to_class :Book
  type 'book_author'
  creates_unique

  property :enjoyed_writing, type: Boolean, default: true

end

# clear out the db
Neo4j::Session.query('START n=node(*) MATCH (n)-[r]->(m) DELETE n,m,r').to_a

a1 = Author.create!(first_name: 'Doubting', last_name: 'Thomas')
a2 = Author.create!(first_name: 'Debbie', last_name: 'Downer')

b1 = Book.create!(title: 'How to lose friends and annoy people')
b2 = Book.create!(title: 'The Art of Foo Bar')

BookAuthor.create!(from_node: a1, to_node: b1)
BookAuthor.create!(from_node: a1, to_node: b2, enjoyed_writing: false)
BookAuthor.create!(from_node: a2, to_node: b2) # co-authors

# find the book that a1 didn't enjoy writing

# 1. this works
rs = a1.books.rel_where(enjoyed_writing: false).to_a
puts "books: #{rs.length} (should be 1)"

# 2. this does not cast 'false' into false
rs = a1.books.rel_where(enjoyed_writing: 'false').to_a
puts "books: #{rs.length} (should be 1)"

# 3. it's necessary to reload to use rel_where
a1.books.to_a
rs = a1.books.rel_where(enjoyed_writing: false).to_a
puts "books: #{rs.length} (should *not* be 2)"