Calling collections property in template returns '0'

[rachelng]

I'm currently trying to put together an index page but I can't seem to call the collection in one of my files without it returning '0' or undefined. Any ideas?

My current file structure:

src
  |-- posts
     |-- index.html
     |-- category1
          |-- post.md
     |-- category2
     |-- category3
layouts
  |-- post.html

This is what I'm calling in posts/index.html

{% for cat in collections.category1 %}
   <li>{{ cat.title }}</li>
{% endfor %}

This is my index.coffee

metalsmith __dirname
      .use define
        config:
          environment: 'develop'
      .use collections
        'category1':
          pattern: 'posts/category1/*.md'
        'category2':
          pattern: 'posts/category2/*.md'
        'category3':
          pattern: 'posts/category3/*.md'
      .use markdown
      .use permalinks
        pattern: 'posts/:collection/:url'
        relative: false
      .use layouts
        engine: 'swig'
        partials: 'partials'
        pattern: '**/*.html'
      .use inPlace 
        engine: 'swig'
        partials: 'partials'
      .use sass
        outputStyle: 'compressed'
      .use autoprefixer()
      .use htmlMinify
        removeAttributeQuotes: false
      .use uglify()
      .build (error) ->
        if error
          console.log error

I'm still pretty new at this and I've tried to dig through similar issues but none of the solutions worked for me. Any help would be appreciated!