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def job_history
    #catch double employee association update
    @histories = @job.versions.delete_if { |version| version.changeset.keys[0] == "updated_at" } 
    
    #change array to ActiveRecord relation
    @histories = @job.versions.where(id: @histories.map(&:id)).paginate(:page => params[:page], :per_page => 15) 
  end

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# app/models/particiapnt.rb
class Participant < ActiveRecord::Base
  belongs_to :country
  has_many :answers
  has_many :questions, through: :answers
end

# app/models/survey.rb
class Survey < ActiveRecord::Base
  has_many :questions

goodviber

To untrack a single file that has already been added/initialized to your repository, i.e., stop tracking the file but not delete it from your system use: git rm --cached filename

To untrack every file that is now in your .gitignore:

First commit any outstanding code changes, and then, run this command:

git rm -r --cached .
This removes any changed files from the index(staging area), then just run:

git add .

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git checkout -b <branch>
Edit files, add and commit. Then push with the -u (short for --set-upstream) option:

git push -u origin <branch>
Git will set up the tracking information during the push.

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<td>
                    {(() => {
                      switch(array.od.stage) {
                        case "Ready To Pick":
                          return <button
                          onClick={() => this.handleShow(array.od.id)}
                          >
                            Start Picking
                          </button>;
                        case "Being Picked":

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class Sophead < ApplicationRecord
  has_many :ods
  has_many :od_items, through: :ods
end
models/od.rb

class Od < ApplicationRecord
  belongs_to :sophead
  has_many :od_items
end

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def edit
    if !!(request.referrer[-1] =~ /\A\d+\z/)
      @page = request.referrer[-1]
    else
      @page = 1
    end
  end
  
  ############## form ################
  

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fetch(url,
    {
      method: 'PUT',
      headers: {'Content-Type': 'application/json',
        'Accept': 'application/json',
        'X-Requested-With': 'XMLHttpRequest',
        'X-CSRF-Token': token},
      body: JSON.stringify({
        "od" : {
          "picker_id" : pickerId,

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git fetch origin branch:branch
git co branch

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trash  /usr/local/var/postgres
initdb -D /usr/local/var/postgres/