```ruby
class LocationsController < ApplicationController

  def index
    # turn current location into some kind of data type that we can query the db for
    # @locations = Location.all
    # iterate through @locations and select the ones that are 500 m away
    @locations = Location.all
    render json: @

    # pg has postgis extension
    # query for locations that are x miles away
    # define a box around a current position
  end

  def create
    if logged_in?
      RSpotify.authenticate(ENV['spotify_id'], ENV['spotify_secret'])
      user = User.find_by(:id => session[:user_id])
      spotify_user = RSpotify::User.find(user.spotify_id)
      @playlists = spotify_user.playlists

      @location = Location.new(location_params)
      if request.xhr?
        @sound_trek = SoundTrek.new
        if @location.save
          render "/sound_treks/new", layout: false
        else
          status 422
        end
      end
    else
      status 401
    end
  end

  private

  def location_params
    params.require(:location).permit(:latitude, :longitude)
  end
end

```

Fix syntax error in index action of location controller
user
```ruby
class LocationsController < ApplicationController

  def index
    # turn current location into some kind of data type that we can query the db for
    # @locations = Location.all
    # iterate through @locations and select the ones that are 500 m away
    @locations = Location.all
    render json: @locations

    # pg has postgis extension
    # query for locations that are x miles away
    # define a box around a current position
  end

  def create
    if logged_in?
      RSpotify.authenticate(ENV['spotify_id'], ENV['spotify_secret'])
      user = User.find_by(:id => session[:user_id])
      spotify_user = RSpotify::User.find(user.spotify_id)
      @playlists = spotify_user.playlists

      @location = Location.new(location_params)
      if request.xhr?
        @sound_trek = SoundTrek.new
        if @location.save
          render "/sound_treks/new", layout: false
        else
          status 422
        end
      end
    else
      status 401
    end
  end

  private

  def location_params
    params.require(:location).permit(:latitude, :longitude)
  end
end

```
assistant