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Joins parent and child tables in rails

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1. Get parent objects: Alert.joins("LEFT JOIN alert_events on alert_events.alert_id =  alerts.id   ").group(' alerts.id ').select(' alerts.*') 2. Get Child Object: AlertEvent.joins("INNER JOIN alerts on  alerts.id  = alert_events.alert_id  ").group(' alert_events.id ').se lect('alert_events.*') Active record for child object AlertEvent.joins(:alert).where (alerts: {category: 'Pay'}) 3. Joins multiple tables:  @previous_seafood_items = SeafoodItem.joins("LEFT JOIN auction_items on auction_items.itemable_id = seafood_items.id and auction_items.itemable_type = 'SeafoodItem' and auction_items.auction_id is NULL")     .group('seafood_items.id')     .select('seafood_items.*')     .where(user_id: current_user.id )     .paginate(:page => params[:page], :per_page => 20)
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Add progress bar to process array requests in Ruby on Rails

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index.html.erb: <div class="row" id="wrapper"> <div class="progress-files-count"></div> <div class="progress">   <div class="progress-bar" role="progressbar" style="width: 0%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"><span class="progress-files-percentage">0</span></div> </div> <table class="table">   <thead>     <tr>       <th scope="col">URL</th>       <th scope="col">EMAIL</th>       <th scope="col">STATUS</th>     </tr>   </thead>   <tbody>   <% @entries.each do |entry| %>     <tr>       <td><%=link_to entry[:link], entry[:link] %></td>       <td><span id="email-<%= entry[:id]%>"></spa...
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Update Ruby version on AWS elastic Beanstalk

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aws elasticbeanstalk update-environment --solution-stack-name "64bit Amazon Linux 2018.03 v2.8.1 running Ruby 2.3 (Puma)" --environment-name "dev-bg-123456" --region "us-east-1" Check available stacks: aws elasticbeanstalk list-available-solution-stacks { "SolutionStacks": [ "64bit Amazon Linux 2018.03 v4.16.0 running Node.js", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 5.4", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 5.5", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 5.6", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 7.0", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 7.1", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 7.2", "64bit Amazon Linux 2018.03 v2.9.11 running PHP 7.3", "64bit Amazon Linux 2018.03 v2.9.15 running Python 3.6", "64bit Amazon Linux 2018.03 v2.9.15 running Python 3.4", "64bit Amazon Linux 2018...
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React form validation and test cases.

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In Component: import React , { Component } from 'react' ; import './InputForm.css' ; class InputForm extends Component { constructor ( props ) { super ( props ); this . onFormSubmit = this . onFormSubmit . bind ( this ); this . validate = this . validate . bind ( this ); this . onInputChange = this . onInputChange . bind ( this ); this . state = { fields : {}, fieldErrors : {}, }; } onInputChange ( e ) { const fields = this . state . fields ; const newFields = {}; newFields [ e . target . name ] = e . target . value ; this . setState ({ fields : {... fields , ... newFields } }); } validate ( formData ) { const errors = {}; if (! formData . name || formData . name === '' || formData . name === null ) { errors . name = 'Please enter your name.' ; } return errors ; } onFormSubmit ( e ...
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