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• Requirements
  • Must be on Ruby 1.9.3 or higher.
• Upgrade Tools
  • Run rake rails:update as quick way to upgrade in place. Check your Git diff afterwards.
  • Use RailsDiff to compare changes between your version of Rails and Rails 4.0.0.
• Upgrade Tips
  • I found it easiest to create a new Rails skeleton app and use it as my index when toggling between the Rails 4.0.0 skeleton and the older Rails 3.x.x app. You can then use Git to compare and adjust differences for each file copied and pasted.
  • When using the above technique, the following files are worth simply copying and pasting and then using Git to compare differences for anything you might not want to loose:

/config/environments/*.rb

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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# mysql-style output for an array of ActiveRecord objects
#
# Usage:
#   report(records)  # displays report with all fields
#   report(records, :field1, :field2, ...) # displays report with given fields
#
# Example:
# >> report(records, :id, :amount, :created_at)
# +------+-----------+--------------------------------+
# | id   | amount    | created_at                     |

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Recommended Videos for Rubyists

• Rules by Sandi Metz
• The Magic Tricks of Testing by Sandi Metz
• All the Little Things by Sandi Metz
• Therepeutic Refactoring Katrina Owen
• Mock Dialogue by Jim Weirich and Joe O'brien
• Refactoring from Good to Great with Ben Orenstein

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class MyAPI < Grape::API
  class CrossOriginResourceSharingPolicy < Grape::Middleware::Base
    def append_cors_headers(headers)
      headers['Access-Control-Allow-Origin'] = env['HTTP_ORIGIN'] || '*'
      headers['Access-Control-Allow-Credentials'] = 'true'
      headers['Access-Control-Max-Age'] = '180'
      if env['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']
        headers['Access-Control-Allow-Headers'] = env['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']
      end
      headers['Access-Control-Allow-Methods'] = 'GET, POST, PUT, DELETE, OPTIONS'

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"actions": {
  "cancel_url": "http://www.yourwebsite.com/cancelurl"
}

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{
  "invoice": {
    "items": {
      
    },
    "taxes": {
      
    },
    "total_amount": 200,
    "description": "Description of the invoice here"

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curl -H "Content-Type: application/json" \
-H "MP-Master-Key: dd6f2c90-f075-012f-5b69-00155d866600" \
-H "MP-Private-Key: test_private_amOI11Gb0SIo6NSLZr1xkfOYSuE" \
-H "MP-Token: d25e1f4ddc053779d526" \
-X POST -d '{ "token" : "OPR-test_17ca95", "confirm_token" : "2082" }' \
"https://app.mpowerpayments.com/sandbox-api/v1/opr/charge"

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curl -H "Content-Type: application/json" \
-H "MP-Master-Key: dd6f2c90-f075-012f-5b69-00155d866600" \
-H "MP-Private-Key: test_private_amOI11Gb0SIo6NSLZr1xkfOYSuE" \
-H "MP-Token: d25e1f4ddc053779d526" \
-X POST -d '{"invoice_data" : {"invoice":{"items": {},"taxes": {},"total_amount": 325,"description": "a tin of milk"},"store":{"name": "Kwame Ayewa Enterprises","tagline": "provision store","postal_address": "P.O.Box 1233 Accra North","phone": "233249441409","logo_url": "","website_url": ""},"custom_data": {},"actions":{"cancel_url": "","return_url": ""}},"opr_data" :{"account_alias" : "mpower2"}}' \
"https://app.mpowerpayments.com/sandbox-api/v1/opr/create"

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#Sandbox Endpoint
https://app.mpowerpayments.com/sandbox-api/v1/checkout-invoice/create

#Live Endpoint
https://app.mpowerpayments.com/api/v1/checkout-invoice/create