Sample State

// entities
//   -products
//     -by_id
//     -all_ids
//   -comments
//     -by_id
//     -all_ids
//   -reviews
//     -by_id
//     -all_ids
//   -topics
//     -by_id
//     -all_ids
//   -collections
//     -by_id
//     -all_ids
//   -user details
//
// ui
//   -current product: 17
//   -current user: 5
//   -current topic: 19
//
// session
//   -user
//
// errors
//   -session
//   -comment form
//   -new product form
//   -edit product form

let state = {
  entities: {
    products: {
      by_id: {

        1: {
          id: 1,
          name: "Product 1 name",
          headline: "Product 1 headline",
          image_url: "image_url",
          author_id: 11,
          topics: [topic1Id, topic2Id, ...],
          upvote_count: 42,
          comment_count: 12,
          current_user_upvoted: false,
          website_url: "www.example.com",
          created_at: 'date-time'
          
        },
        
        2: {
          id: 2,
          name: "Product 2 name",
          headline: "Product 2 headline",
          image_url: "image_url",
          author_id: 17,
          topics: [topic1Id, topic2Id, ...],
          upvote_count: 1729,
          comment_count: 1618,
          current_user_upvoted: false,
          website_url: "www.example.com",
          created_at: 'date-time'
          
        },
        
        
        173: {  //Currently viewed product
          id: 173,
          name: "Product 173 name",
          headline: "Product 173 headline",
          image_url: "image_url",
          author_id: 11,
          maker: { userobj },
          hunter: { userobj },
          topic: 'some topic',
          subtopics: [1,2,3],
          upvotes: 42,
          current_user_upvoted: false,
          product_of_the_day: 2,
          website_url: "www.example.com",
          related_products: [...products], //ordered at model level
          featured: 'date-time',
          media_urls: [url1Id, url2Id, ...], //ordered at model level
          
          reviews: [review1Id, review2Id, ...], //ordered at model level
          
          discussion: [comment1Id, comment2Id,...] //ordered at model level
        }
      },
      
      all_ids: [1,2,173,...]
      },
      
      topics: {
        by_id: {

          1: {
            id: 1,
            title: "tech"
          },
          
          2: {
            id: 2,
            title: "drones"
          }
        },
        all_ids: [1,2,...]
    }

    comments: {
      by_id: {

        1: {
          id: 1,
          body: "Comment 1 body",
          comment_parent: { commentobj },
          productId: productId
          user: { userobj },
          likes: 165,
          link_url: "link_url",
          author_is_maker: true/false
          
        }
        2: {
          id: 2,
          body: "comment 2 body"
          ...
        }
      },
      all_ids: [1,2,...]
      },
      
      user: {
        id: 17,
        username: 'username',
        headline: 'three word phrase',
        upvotes: [post1Id, post2Id, ...],
        submitted: [post17Id, post19Id, ...],
        made_products: [products173Id, ...],
        topics: [...topicIds],
        collections_made: [...collectionIds],
        followed_collections: [...collectionIds]
      }
      
      reviews: {
        by_id: {

          1: {
            id: 1
            body: "Review one",
            ...
          }
        },
        all_ids: [1,2,...]
    },

    search: {
      search_term: "mac apps",
      user_results: [...userIds],
      product_results: [...productIds],
      collection_results: [...collectionIds]
    }

  },

  ui: {
    loading: true/false,
    current_product: 173,
    current_topic: 3,
    current_user: 17
  },

  session: {
    user: {
      name: "current user name",
      image_url: "image_url"
    }
  },

  errors: {
    session: ['must be logged in to see form'],
    new_product_form: ['post name can\'t be blank'],
    new_comment_form: ['comment can\'t be blank']
  }
};