rails check_box_tag to include existing values of from array of records

Question

The following tag in a nested form

<%= check_box_tag "friend_ids[]", ff.id, @contentrestrictions.friends.include?(ff.id) %>

is handling the following array of records

>> @contentrestrictions

[
#<Contentrestriction id: 29, usercontent_id: nil, friend_id: nil, created_at: "2019-04-28 10:55:32", updated_at: "2019-04-28 10:55:32">, 
#<Contentrestriction id: 30, usercontent_id: nil, friend_id: 2, created_at: "2019-04-28 10:55:32", updated_at: "2019-04-28 10:55:32">, 
#<Contentrestriction id: 31, usercontent_id: nil, friend_id: 4, created_at: "2019-04-28 10:55:32", updated_at: "2019-04-28 10:55:32">]

Even though

class Contentrestriction < ApplicationRecord
  belongs_to :friend, optional: true

@contentrestrictions. followed by any of friend_id, friend_ids both appended with or without [] all lead to NoMethodError: undefined method for Array.

how can this include function get a proper array to work with?

<%= check_box_tag "friend_ids[]", ff.id, @contentrestrictions.pluck(:friend_id).include?(ff.id) %>. Consider asign @contentrestrictions.pluck(:friend_id) to a variable if used more than one time in the template. — CAmador
– CAmador, Commented Apr 28, 2019 at 12:27
Goodness gracious! I use pluck all the time, but it did not dawn on me here! — Jerome
– Jerome, Commented Apr 28, 2019 at 12:44

localhostdotdev · Accepted Answer · 2019-04-28 13:24:13Z

1

the issue is in this line:

@contentrestrictions.friends.include?(ff.id)

you are comparing a friend object with a friend id, you could use pluck to get the friend ids, or you could just compare the objects:

@contentrestrictions.friends.include?(ff)

this will make a query for the .friends and you could remove this query by pre-loading the friends association, e.g. eager_load(:friends) or includes(:friends)

answered Apr 28, 2019 at 13:24

localhostdotdev

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