if you're trying to avoid polluting `posts.yml` with those `find_existing_by` options, you can create a differently-named seed record file that still seeds posts, then do:

```ruby
sow [[Post, { data: { source: open(path/to/posts_with_find_by_existing_multiple.yml) } } ]]

# or with @fosome's PR
posts = { class: Post, source: open(path/to/posts_with_find_by_existing_multiple.yml) }
sow [posts]
```