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How to create and render an app.json file for Heroku


How to create and render an app.json file for Heroku

By : Jake Peters
Date : September 18 2020, 06:00 AM
This might help you A json file start with { and finish with } is that the case in your file ?
code :


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Efficient way to render ton of JSON on Heroku

Efficient way to render ton of JSON on Heroku


By : Carlton Danks
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Sounds like you want to stream the JSON directly to the client instead of building it all up in memory. It's probably the best way to cut down memory usage. You could for example use yajl to encode JSON directly to a stream.
Edit: I rewrote the entire code for yajl, because its API is much more compelling and allows for much cleaner code. I also included an example for reading the response in chunks. Here's the streamed JSON array helper I wrote:
code :
require 'yajl'

module JsonArray
  class StreamWriter
    def initialize(out)
      super()
      @out = out
      @encoder = Yajl::Encoder.new
      @first = true
    end

    def <<(object)
      @out << ',' unless @first
      @out << @encoder.encode(object)
      @out << "\n"
      @first = false
    end
  end

  def self.write_stream(app, &block)
    app.stream do |out|
      out << '['
      block.call StreamWriter.new(out)
      out << ']'
    end
  end
end
require 'sinatra'
require 'mongoid'

Mongoid.identity_map_enabled = false

# use a server that supports streaming
set :server, :thin

get '/' do
  content_type :json
  JsonArray.write_stream(self) do |json|
    Book.all.each do |book|
      json << book.attributes
    end
  end
end
require 'yajl'

module JsonArray
  class StreamParser
    def initialize(&callback)
      @parser = Yajl::Parser.new
      @parser.on_parse_complete = callback
    end

    def <<(str)
      @parser << str
    end
  end

  def self.parse_stream(&callback)
    StreamParser.new(&callback)
  end
end
require 'em-http'

parser = JsonArray.parse_stream do |object|
  # block is called when we are done parsing the
  # entire array; now we can handle the data
  p object
end

EventMachine.run do
  http = EventMachine::HttpRequest.new('http://localhost:4567').get
  http.stream do |chunk|
    parser << chunk
  end
  http.callback do
    EventMachine.stop
  end
end
[{ ... book_1 ... }
,{ ... book_2 ... }
,{ ... book_3 ... }
...
,{ ... book_n ... }
]
{ ... book_1 ... }
{ ... book_2 ... }
{ ... book_3 ... }
...
{ ... book_n ... }
require 'sinatra'
require 'mongoid'
require 'yajl'

Mongoid.identity_map_enabled = false
set :server, :thin

get '/' do
  content_type :json
  encoder = Yajl::Encoder.new
  stream do |out|
    Book.all.each do |book|
      out << encoder.encode(book.attributes) << "\n"
    end
  end
end
require 'em-http'
require 'yajl'

parser = Yajl::Parser.new
parser.on_parse_complete = Proc.new do |book|
  # this will now be called separately for every book
  p book
end

EventMachine.run do
  http = EventMachine::HttpRequest.new('http://localhost:4567').get
  http.stream do |chunk|
    parser << chunk
  end
  http.callback do
    EventMachine.stop
  end
end
Why are my render json: data requests suddenly slow on Heroku?

Why are my render json: data requests suddenly slow on Heroku?


By : user2084271
Date : March 29 2020, 07:55 AM
Any of those help Resolved. It was a Heroku platform issue.
https://status.heroku.com/incidents/649
code :
Investigating
Our automated systems have detected potential platform errors. 
We are investigating.

Posted Jul 12, 2014 23:38 UTC
React.render() is giving error when we create component in one js file and render it in another js file

React.render() is giving error when we create component in one js file and render it in another js file


By : Marvi
Date : March 29 2020, 07:55 AM
this one helps. For this sample I was using react.js file . Removed the js file and started using npm react tools and web pack. This solved my problem. I have gone through the following site for a sample.. http://jmfurlott.com/tutorial-setting-up-a-single-page-react-web-app-with-react-router-and-webpack/
heroku js.erb file outputs forms it's supposed to render as text

heroku js.erb file outputs forms it's supposed to render as text


By : user293667
Date : March 29 2020, 07:55 AM
may help you . this is the site: https://deadindustry-newnew-recruit.herokuapp.com/ , You pass a wrong action into the form
code :
<form novalidate="novalidate" class="simple_form new_supporter" id="new_supporter" 
action="/supporters.js" accept-charset="UTF-8" data-remote="true" method="post">
<%= simple_form_for(@supporter, remote: true, format: :js) do |f| %>
Heroku with react server side render, error "Cannot find module '../public/webpack-assets.json'

Heroku with react server side render, error "Cannot find module '../public/webpack-assets.json'


By : Dean Burchill
Date : March 29 2020, 07:55 AM
help you fix your problem Have you check the troubleshoots section (https://github.com/wellyshen/react-cool-starter#troubleshooting)?
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