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Get Posts

This example will output posts depending on which category is provided as the arguments.

Full, runnable src of Get Posts can be downloaded as part of: tutorials/ruby (or download just this tutorial: devportal-master-tutorials-ruby-04_get_posts.zip).

Also see:

Script

get_posts_by_category.rb

This script will pick a method to call based on the arguments passed. The expected categories are:

We will base the name of the API method to execute on the provided argument. Once we know which method to execute, we can build the query options. The defaults for this script is limit: 10 and tag: ''.

For each post we retrieve, we are going to build up a summary to display the interesting fields. In this case, we’re interested in:

Final code:

require 'rubygems'
require 'bundler/setup'

Bundler.require

CATEGORIES = %i(trending hot active created votes promoted children)

if ARGV.size < 1
  puts "Usage:"
  puts "ruby #{__FILE__} <#{CATEGORIES.join('|')}> [limit] [tag]"
  exit
end

category = ARGV[0].downcase.to_sym

unless CATEGORIES.include? category
  puts "Unknown category: #{category}"
  puts "Expecting one of: #{CATEGORIES.join(', ')}"
  exit
end

limit = (ARGV[1] || '10').to_i
tag = ARGV[2] || ''
api = Radiator::Api.new

options = {
  tag: tag,
  limit: limit
}

api.send("get_discussions_by_#{category}", options) do |posts, error|
  if !!error
    puts error.message
    exit
  end
  
  posts.each do |post|
    words = post.body.split(/\s/)
    author = post.author
    promoted = post.promoted
    uri = []

    uri << post.parent_permlink
    uri << "@#{author}"
    uri << post.permlink

    puts created = Time.parse(post.created + 'Z')
    puts "  Post: #{post.title}"
    puts "  By: #{author}"
    puts "  Votes: #{post.net_votes}"
    puts "  Replies: #{post.children}"
    puts "  Promoted: #{promoted}"
    puts "  Words: #{words.size}"
    puts "  https://hive.blog/#{uri.join('/')}"
  end
end

To Run

First, set up your workstation using the steps provided in Getting Started. Then you can create and execute the script (or clone from this repository):

git clone https://gitlab.syncad.com/hive/devportal.git
cd devportal/tutorials/ruby/04_get_posts
bundle install
ruby get_posts_by_category.rb trending 1 hive

Example Output

2021-03-17 15:47:36 UTC
  Post: Introducing DEC Farming on Cub Finance | Changes to Dens/Farms, 24 Hours Left for Wrapping CUB
  By: leofinance
  Votes:
  Replies: 81
  Promoted: 0.000 HBD
  Words: 1331
  https://hive.blog/hive-167922/@leofinance/introducing-dec-farming-on-cub-finance-or-changes-to-dens-farms-24-hours-left-for-wrapping-cub

Error Handling

We’re checking the result for error in case the remote node has an issue to raise. Normally, it will be nil, but if it’s populated, output error.message and exit.

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