scinote-web/app/datatables/team_users_datatable.rb

class TeamUsersDatatable < AjaxDatatablesRails::Base
  include InputSanitizeHelper

  def_delegator :@view, :link_to
  def_delegator :@view, :update_user_team_path
  def_delegator :@view, :destroy_user_team_html_path

  def initialize(view, team, user)
    super(view)
    @team = team
    @user = user
  end

  def sortable_columns
    @sortable_columns ||= [
      'User.full_name',
      'User.email',
      'UserTeam.created_at',
      'User.confirmed_at',
      'UserTeam.role'
    ]
  end

  def searchable_columns
    @searchable_columns ||= [
      'User.full_name',
      'User.email',
      'UserTeam.created_at'
    ]
  end

  # A hack that overrides the new_search_contition method default behavior of
  # the ajax-datatables-rails gem now the method checks if the column is the
  # created_at and generate a custom SQL to parse it back to the caller method
  def new_search_condition(column, value)
    model, column = column.split('.')
    model = model.constantize
    formated_date = (I18n.t 'time.formats.datatables_date')
                    .gsub!(/^\"|\"?$/, '')
    if column == 'created_at'
      casted_column = ::Arel::Nodes::NamedFunction.new(
        'CAST',
        [Arel.sql(
          "to_char( users.created_at, '#{formated_date}' ) AS VARCHAR"
        )]
      )
    else
      casted_column = ::Arel::Nodes::NamedFunction.new(
        'CAST',
        [model.arel_table[column.to_sym].as(typecast)]
      )
    end
    casted_column.matches("%#{value}%")
  end

  private

  # Returns json of current samples (already paginated)
  def data
    records.map do |record|
      {
        'DT_RowId': record.id,
        '0': escape_input(record.user.full_name),
        '1': escape_input(record.user.email),
        '2': record.role_str,
        '3': I18n.l(record.created_at, format: :full_date),
        '4': record.user.active_status_str,
        '5': ApplicationController.new.render_to_string(
          partial: 'users/settings/teams/user_dropdown.html.erb',
          locals: {
            user_team: record,
            update_role_path: update_user_team_path(record, format: :json),
            destroy_uo_link: link_to(
              I18n.t('users.settings.teams.edit.user_dropdown.remove_label'),
              destroy_user_team_html_path(record, format: :json),
              remote: true,
              data: { action: 'destroy-user-team' }
            ),
            user: @user
          }
        )
      }
    end
  end

  # Query database for records (this will be later paginated and filtered)
  # after that "data" function will return json
  def get_raw_records
    UserTeam
      .includes(:user)
      .references(:user)
      .where(team: @team)
      .distinct
  end
end