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Rails nested form: check if child record exists

newclass Sample < ActiveRecord::Base belongs_to :patient accepts_nested_attributes_for :patient def patient_attributes=(attrs) self.patient = Patient.where(attrs).first_or_initialize(attrs) @show_exists_message = [email protected]_record? end end

Check if child record exists, If yes update else create. Happy ending :) ref. http://stackoverflow.com/questions/23713674/check-if-record-exist-if-yes-update-else-create-new-nested-forms-rails

Reset

ActiveRecord::RecordNotUnique (PG::Error: ERROR: duplicate key value violates unique constraint "[TABLE]_pkey" http://apidock.com/rails/ActiveRecord/ConnectionAdapters/PostgreSQLAdapter/reset_pk_sequence!

ActiveRecord::Base.connection.tables.each { |t| ActiveRecord::Base.connection.reset_pk_sequence!(t) }

or you can use above code in rails console ref. http://stackoverflow.com/questions/11068800/rails-auto-assigning-id-that-already-exists

How to fix SSL CERT FILE

SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

update cert

export $SSL_CERT_FILE=/usr/local/etc/openssl/cert.pem curl http://curl.haxx.se/ca/cacert.pem -o $SSL_CERT_FILE curl http://curl.haxx.se/ca/cacert.pem -o /usr/local/etc/openssl/*.pem curl http://curl.haxx.se/ca/cacert.pem -o /opt/local/etc/certs/cacert.pem

update rbenv

rbenv rehash

update OpenSSL

openssl version brew update brew install openssl brew unlink openssl && brew link openssl --force

replace outdated OpenSSL certificates

brew tap raggi/ale

after update cert, we should restart terminal and try again. reference:

http://railsapps.github.io/openssl-certificate-verify-failed.html

If you have two array like this

bird = ['legs', 'wings'] cat = ['legs']

intersect = bird & cat

intersect should now be ['legs'] and yes, It looks like same on model too. :)

#rails #array #ruby #model

class Cat < ActiveRecord::Base STARS = { popular: 5, awesome: 5, nice: 4 } end

you can use this option by

rate = Cat::STARS.select { |k, v| v == 5 }

then when you would like to call key or value

rate.each |k, v| puts "#{k} is #{v} rate." end

okay, follow winds of coding again. look like simple :)

such as Helper

module ApplicationHelper NAMES = "I am babes rails" end

you can use like this

<%= ApplicationHelper::NAMES %>

nice!

happiness with your code :)

#rails #model #helper #constant #variable #instance variable

class User < ActiveRecord::Base end class Student < User end class Teacher < User end

when you create form_for with student or teacher it must be return with student[attribute] or teacher[attribute] not user[attribute]

def edit @user = User.find(params[:id]) end

you can input like this in your form_for

<%= form_for @user, as: :user, method: :put %> <% end %>

yes, it just add as: :user to your form. look like simple, right? it's nice way :)

#rails #form_for #STI

OS X: How to install CoffeeScript with NodeJS

Install node.js by homebrew

brew install node

brew link node

If you can't link node and it display error with 'permission' you should change permission on node directory such as sudo chmod 777 /usr/local/include/node/

then you must have npm (Node Packaged Modules) first

curl https://npmjs.org/install.sh | sh

when you install npm finished then install coffeescript

npm install -g coffee-script

If you would like add /usr/local/lib/node to PATH or NODE_PATH you can type like this

export PATH=$PATH:/usr/local/lib/node export NODE_PATH=$NODE_PATH:/usr/local/lib/node

install textmate coffeescript bundles

mkdir -p ~/Library/Application\ Support/TextMate/Bundles

cd ~/Library/Application\ Support/TextMate/Bundles

git clone git://github.com/jashkenas/coffee-script-tmbundle CoffeeScript.tmbundle

Reference:

How To Install CoffeeScript On Mac OS X

How to install coffee-script, and how to enable textmate bundler to compile coffeescript (gist)

textmate bundle for coffeescript (stackoverflow)

coffee-script-tmbundle (github)

#nodejs #coffeescript #os x

Ruby: Directory sort string embedded number

It pay my pain for simple sort this is my solution:

files = Dir.entries(dirpath).sort_by { |page| page =~ /(\d+).(png|jpg)$/ ; [$1.to_i, $2.to_i] } files_ino = Dir.entries(dirpath).sort_by { |a| File.stat("#{dirpath}/#{a}").ino }

First: use regular expression then what ever you would like to manage (In my case is 'text_1.png')

Second: use File.stat(file).ino, it return inode number for stat

#ruby #sort by string

Protocol

helper.request.stub(:protocol).and_return("http://")

Host

helper.request.stub(:host).and_return("www.foo.com")

Port

helper.request.stub(:port).and_return(80) helper.request.stub(:port_string).and_return(":80")

Path

helper.request.stub(:path).and_return("/asdf.asdf")

Canoniacal URL (Full path)

helper.canonical_url.should eq("http://www.foo.com/asdf.asdf")

you can use helper.request.stub(:path).and_return(root_path) for stub this request path to root.

it's very simple to use.

#rails #helper #rspec #url

when you have object or model..

class Foo def initialize @bar = 5 end end

you can get instance variable of object like this:

foo = Foo.new puts foo.instance_variable_get(:@bar)

5

and you can set instance variable too.

foo.instance_variable_set(:@bar, 10) puts foo.instance_variable_get(:@bar)

10

Yes, It's very nice for testing because RSpec have instance variable too. Reference:

Object#instance_variable_get

Object#instance_variable_set

#rails #rspec #testing #instance variable #object #model

How to change your mac hostname on terminal?

scutil --set hostname your_would_like_name

via: Change your Mac Hostname via Terminal

you can typing like this:

<%= link_to "Trash", account_path(@account, trash: true), method: :put %>

with this path:

/account/[account_id]?trash=true

it will post update on AccountsController like this

def update @account = Account.find(params[:account_id]) @account.update_attributes(trash: params[:trash]) end

when you use update_attributes(params[:account]) in controller try below instead:

def update @account = Account.find(params[:account_id]) @account.update_attributes(params[:account]) end

<%= link_to "Trash", account_path(@account, account: { trash: true }), method: :put %>

it's just fine way :)

#rails #link_to #update

on terminal commands rails c

app.root_url

"http://www.example.com/"

app.change_password_path

"/change/password"

app.change_password_url

"http://www.example.com/change/password"

--

_path: it will display just path

_url: display path with root url :)

#rails #routes #helper #path

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