CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4activerecordmodel
ChibiNya
ChibiNya

Reputation: 133

Rails 4.2.6 adding extra attributes to activerecord elements

I want to add extra fields to the results of a query without first converting to JSON.

I have 3 models team, tournament and match, with the following relationship:

class Match < ActiveRecord::Base
   belongs_to :homeTeam, class_name: "Team", foreign_key: "localTeam"
   belongs_to :awayTeam, class_name: "Team", foreign_key: "visitorTeam"

class Team < ActiveRecord::Base
   has_many :local_matches, class_name: "Match", foreign_key: "localTeam"
   has_many :visitor_matches, class_name: "Match", foreign_key: "visitorTeam"

class Tournament < ActiveRecord::Base
  has_many :matches, class_name:"Match",foreign_key: "tournamentId"

In the Tournament class, I'm trying to add a function that will give me a list of all matches in the tournamet, but for each match it should include some data from theTeams involved in it (homeTeam and awayTeam).

I'm trying the following:

def tournament_matches
 matches= self.matches
 matches.each do |match|
  match[:home_team_logo] = match.homeTeam.logo //add this field
  match[:visitor_team_logo] = match.awayTeam.logo //add this field
 end
 matches.group_by(:round)
end

But I get an error:
ActiveModel::MissingAttributeError: can't write unknown attribute 'local_team_name'

What can I do so that I can add extra fields from Team to my ActiveRecord::Associations::CollectionProxy Match class elements in the return? Keep in mind that Team.logo is a function, not an attribute.

Upvotes: 0

Views: 828

Answers (1)

Gagan Gupta
Gagan Gupta

Reputation: 1227

you can use attr_accessor in Team Model and store values in it. It creates a virtual field which doesn't exists in Database but you will be able to access it using match.homeTeam.<attribute_name>. you can read about attr_accessor here:

What is attr_accessor in Ruby?

https://apidock.com/ruby/Module/attr_accessor

Upvotes: 1

Related Questions