Ruby / Rails - .each Iterator is printing entire array at the end of the loop [duplicate]

Answer 1

It's because it's what happen when you do

def self.all_categories
  Attraction.select("DISTINCT category")
end

It's create an Attraction Object with attribute define by your field. You can do

def self.all_categories
  Attraction.select("DISTINCT category").map(&:category)
end

Answer 2

# Change this line with an =:
<%= @categories.each do |c| %>
# ...to this:
<%  @categories.each do |c| %>

You only want the side effects on the block of the #each method, you don't want interpolation of the returned value.