Rails API

gistfile1.rb

###
  possible schema
###

User
  has_many :posts
  has_many :tools
  has_many :products, through: :tools

Post
  belongs_to :user
  has_many :tools
  has_many :products, through: :tools

Tool
  has_many :users
  has_many :posts



###
  pseudo-code
###

user          # => { id: 1, name: "Ben Babics" }
user.posts    # => [{ id: 3, name: "How To Fix Leaky Pipes", user_id: 1 }]
user.products # => [{ id: 5, name: "Hammer", user_id: 1, post_id: 3 }]

user.posts.first          # => { id: 3, name: "How To Fix Leaky Pipes", user_id: 1 }
user.posts.first.products # => [{ id: 5, name: "Hammer", user_id: 1, post_id: 3 }]

post.products # => [{ id: 5, name: "Hammer", user_id: 1, post_id: 3 }]