Module: AutoSelectable

Defined in:
lib/active_admin_auto_select.rb

Instance Method Summary collapse

Instance Method Details

#auto_select(*fields) ⇒ Object 



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# File 'lib/active_admin_auto_select.rb', line 5

def auto_select(*fields)
  options = fields.extract_options!

  # The @resource instance variable seems unavailable in versions 
  # later than 1.0.0.pre1 of the ActiveAdmin.
  resource = @resource || self.config.resource_class_name.constantize
  
  create_collection_action(fields, options, resource)
end

#create_collection_action(fields, options, resource) ⇒ Object 



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# File 'lib/active_admin_auto_select.rb', line 15

def create_collection_action(fields, options, resource)
  collection_action :autoselect, :method => :get do
    select_fields = "#{resource.table_name}.id, " << fields.join(', ')
    if (Module.const_get(:CanCanCan) rescue false) ? authorized?(:read, resource) :true
      term = params[:q].to_s
      term.gsub!('%', '\\\%')
      term.gsub!('_', '\\\_')
      first_term = term.try(:match, /\w \w/) ? (term.split(' '))[0] : term
      page = params[:page].try(:to_i)
      offset = page ? (page - 1) * 10 + (5 * (page - 1)) : 0

      #params[:scope] is passed through js when we define the relevate data attribute on the filter
      #default_scope is passed as a proc argument in #auto_select and overrides the default resource scope
      effective_scope = options[params[:scope]] || options['default_scope'] || ->{ resource }

      #This param exists when we have a filtered result
      if params[:ids].present?
         resources = effective_scope.call.
           where("#{resource.table_name}.id IN (?)", params[:ids]).
           select(select_fields)
         if resources.size == 1
           resources = resources.first
         else
           resources = resources.sort_by { |r| params[:ids].index(r.id.to_s) }
         end
         render json: resources and return
      else
        concat_fields = fields.join(" || ' '::text || ")
        concat_cols = "((#{concat_fields})" <<  " || ' '::text || #{resource.table_name}.id::text)"

        similarity_sql = ActiveRecord::Base.send(:sanitize_sql_array,
            ["(similarity(#{resource.table_name}.id::text, :id) + similarity(#{concat_cols}, :id))", id: term])

        resource_records = effective_scope.call.
          select(select_fields << ", #{similarity_sql} as similarity").
          where("#{concat_cols} ILIKE :term", term: "%#{first_term}%").
          order("#{similarity_sql} DESC").
          limit(15).offset(offset).
          map { |r| r.attributes.reject { |a| a == 'similarity'} }
      end

      render json: resource_records
    end
  end
end