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# Web App Performance

## Back End

### N+1
```
@posts = Post.all
# …
@post.each do |post|
  puts post.comments.count

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require 'json'
require 'net/http'

status = nil
until status == 'good'
  url = URI('https://status.github.com/api/status.json')
  response = Net::HTTP.get(url)
  body = JSON.parse(response)
  p body
  status = body['status']

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Just a quick note on the problem a couple of you were having yesterday where a rails generator appeared not to 
be creating files. A zombie "spring" process from a different project was still running and so the generator was 
actually writing files into a different application.

You can read about what spring does here: https://github.com/rails/spring The short version is that it's an application 
preloader that makes running certain tasks faster by keeping parts of your app loaded in memory. 
This makes things like running your tests faster as the app doesn't have to load from scratch every time.

If you don't want an app to use it, pass --skip-spring as an option to rails new.

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<aura:component >
    <aura:attribute name="value" type="Integer" default="0" />
    <aura:attribute name="variant" type="String" />

    <aura:attribute name="hasVariant" type="Boolean" access="private" default="{!false}" />
    <aura:attribute name="ringClass" type="String" access="private" />
    <aura:attribute name="iconName" type="String" access="private" />
    <aura:attribute name="altText" type="String" access="private" />
    
    <aura:handler name="init" value="{!this}" action="{!c.updateView}" />

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<aura:component >
    <aura:attribute name="value" type="Integer" default="0" />
    <aura:attribute name="variant" type="String" />

    <aura:attribute name="hasVariant" type="Boolean" access="private" default="{!false}" />
    <aura:attribute name="ringClass" type="String" access="private" />
    <aura:attribute name="iconName" type="String" access="private" />
    <aura:attribute name="altText" type="String" access="private" />
    
    <aura:handler name="init" value="{!this}" action="{!c.updateView}" />

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<aura:component controller="Lookup"> 
     <aura:attribute Name="selItem" type="object" access="public" 
                     description="This attribute can be used by parent component to read selected record"/>  
     <aura:attribute Name="server_result" type="object[]" access="private" /> 
     
     <aura:attribute name="lookupIcon" type="String" access="public" default="standard:contact"/>
    
    <aura:attribute name="objectName" type="String" access="public" 
                    description="Name of Object to be searched"/>
    <aura:attribute name="field_API_text" type="String" access="public" 

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mkdir ~/vim
cd ~/vim

# Staically linked vim version compiled from https://github.com/ericpruitt/static-vim
# Compiled on Jul 20 2017
curl 'https://s3.amazonaws.com/bengoa/vim-static.tar.gz' | tar -xz

export VIMRUNTIME="$HOME/vim/runtime"
export PATH="$HOME/vim:$PATH"
cd -

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exports.handler = function(context, event, callback) {

    //================================================================================
    // Modules
    //================================================================================

    var querystring = require('querystring');
    var request = require('request');

    //================================================================================

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        window.open('/lightning/o/Event/new');
        
        var urlEvent = $A.get("e.force:navigateToURL");
        urlEvent.setParams({
            "url": "/lightning/o/Event/new"
        });
        urlEvent.fire();

        var createRecordEvent = $A.get("e.force:createRecord");
        createRecordEvent.setParams({

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//After Inserting opportunities
List<Opportunity> opptys = new List<Opportunity>();
insert opptys;

// Get the IDs of the opportunities we just inserted
Map<Id, Opportunity> opptyMap = new Map<Id, Opportunity>(opptys);
//This will create a map of the opportunities
// Will allow you to do this
List<Id> opptyIds = new List<Id>(opptyMap.keySet());