Refactor the Book generator to add authors and a related book to opts.

test/support/generators.ex

@@ -56,11 +56,16 @@ defmodule DecentralisedBookIndex.Generators do
           generate(user())
         end)
 
-    count =
-      opts[:count] || 2
+    authors =
+      opts[:authors] ||
+        for id <- 1..2 do
+          generate(author(actor: actor)) #.id
+        end
 
-    for order <- 1..count do
-      %{order: order, author_id: generate(author(actor: actor)).id, role: ""}
+    count = min(opts[:count], length(authors))
+
+    for {order, author} <- Enum.zip(1..count, authors) do
+      %{order: order, author_id: author.id, role: ""}
     end
   end
 
@@ -128,10 +133,12 @@ defmodule DecentralisedBookIndex.Generators do
           bids()
         end)
 
+    authors = opts[:authors] || nil
+
     author_roles =
       opts[:author_roles] ||
         once(:default_author_roles, fn ->
-          author_roles()
+          author_roles(authors: authors)
         end)
 
     publisher_id =
@@ -140,6 +147,15 @@ defmodule DecentralisedBookIndex.Generators do
           generate(publisher()).id
         end)
 
+    related_book = opts[:related_book] || nil
+
+    book_editions_registry_id =
+      if related_book do
+        related_book.book_editions_registry_id
+      else
+        nil
+      end
+
     changeset_generator(
       Metadata.Book,
       :create,
@@ -153,7 +169,7 @@ defmodule DecentralisedBookIndex.Generators do
         bids: bids,
         author_roles: author_roles,
         publisher_id: publisher_id,
-        book_editions_registry_id: nil,
+        book_editions_registry_id: book_editions_registry_id,
       ],
       overrides: opts,
       actor: actor