comments.json resource with system/via and data not relevant to the example stripped. Shows how to filter this comments page using the ruby client and built-in ruby functions. The example comments follow this pattern: foo = private, bar = public

filter_comments_ruby_api_client.rb

# This script assumes you have instantiated a ZendeskAPI::Client and assigned it to 'client'

ticket  = client.tickets.find(:id => 4060)
comments = ticket.comments.fetch

# Iterate over comments and show comment value and value for the 'public' attribute (using example json public comments are 'bar' and private are 'foo')
comments.each do |c|
  puts "the comment value is #{c.body}"
  puts "the comments 'public' attribute is #{c.public}"
end;nil

# Iterate over comments with select() which takes a comparison and filters out any items where the comparison does not match
# var_filtered = array.select {|iteratee| iteratee.predicate == filter_criteria}
public_comments = comments.select {|c| c.public == true}

# Should only output comments with 'bar' in value (and description)
public_comments.each do |c|
  puts c.body
end

ticket_comments_stripped.json

{
  "comments": [
    {
      "id": 152304242507,
      "type": "Comment",
      "author_id": 481734407,
      "body": "This is the first comment on the request.\n\ndantheman",
      "html_body": "<div class=\"zd-comment\">\n<p dir=\"auto\">This is the first comment on the request.</p>\n<p dir=\"auto\">dantheman</p>\n</div>",
      "public": true,
    },
    {
      "id": 152653101188,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    },
    {
      "id": 152304381087,
      "type": "Comment",
      "author_id": 481734407,
      "body": "bar\n\ndantheman",
      "html_body": "<div class=\"zd-comment\">\n<p dir=\"auto\">bar</p>\n<p dir=\"auto\">dantheman</p>\n</div>",
      "public": true,
    },
    {
      "id": 152304398147,
      "type": "Comment",
      "author_id": 481734407,
      "body": "bar\n\ndantheman",
      "html_body": "<div class=\"zd-comment\">\n<p dir=\"auto\">bar</p>\n<p dir=\"auto\">dantheman</p>\n</div>",
      "public": true,
    },
    {
      "id": 152304427667,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    },
    {
      "id": 152304462487,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    },
    {
      "id": 152304485047,
      "type": "Comment",
      "author_id": 481734407,
      "body": "bar\n\ndantheman",
      "html_body": "<div class=\"zd-comment\">\n<p dir=\"auto\">bar</p>\n<p dir=\"auto\">dantheman</p>\n</div>",
      "public": true,
    },
    {
      "id": 152653288548,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    },
    {
      "id": 152304541607,
      "type": "Comment",
      "author_id": 481734407,
      "body": "bar\n\ndantheman",
      "html_body": "<div class=\"zd-comment\">\n<p dir=\"auto\">bar</p>\n<p dir=\"auto\">dantheman</p>\n</div>",
      "public": true,
    },
    {
      "id": 152304567787,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    },
    {
      "id": 152653365708,
      "type": "Comment",
      "author_id": 481734407,
      "body": "foo",
      "html_body": "<div class=\"zd-comment\"><p dir=\"auto\">foo</p></div>",
      "public": false,
    }
  ],
  "next_page": null,
  "previous_page": null,
  "count": 11
}