Extract records from Rails array

Question

I have this variable in my pdforms_controller that is grouping all of the pdforms based on their group_id.

@groups = Pdform.where(principal_action: 'approved', super_action: 'new').group_by(&:group_id)

>      {"DSC-002"=>[#<Pdform id: 63, date_start: "2017-12-08", date_finish: "2017-12-09", location: "First test", mtg_name: "First
> test", memo: "First test", acct_num: "12312312323", sub: true,
> accepted: false, guest_id: nil, created_at: "2017-12-08 21:36:37",
> updated_at: "2017-12-21 15:43:57", user_id: 13, pdtype:
> "instructional", reason: nil, prr_requested: nil, length: "full",
> principal_action: "approved", super_action: "new", group_id:
> "DSC-002", is_group: false>], 
>         "DSC-001"=>[#<Pdform id: 64, date_start: "2017-12-19", date_finish: "2017-12-20", location: "test", mtg_name: "test", memo:
> "test", acct_num: nil, sub: false, accepted: false, guest_id: nil,
> created_at: "2017-12-19 14:37:48", updated_at: "2017-12-20 18:05:55",
> user_id: 13, pdtype: "instructional", reason: "Dont like\r\n",
> prr_requested: nil, length: "half", principal_action: "approved",
> super_action: "new", group_id: "DSC-001", is_group: false>, #<Pdform
> id: 65, date_start: "2017-12-19", date_finish: "2017-12-20", location:
> "group test", mtg_name: "group test", memo: "group test", acct_num:
> "", sub: false, accepted: false, guest_id: nil, created_at:
> "2017-12-19 20:20:02", updated_at: "2017-12-21 15:50:21", user_id: 13,
> pdtype: "technology", reason: "wait, huh?", prr_requested: nil,
> length: "half", principal_action: "approved", super_action: "new",
> group_id: "DSC-001", is_group: false>]}

Right now I am just calling this in my view to display this information.

<%= @groups.each do |group| %>
  <%-# do something -%>
<% end %>

How can I get each record out of this array and display that data in separate columns, bootstrap cards, or whatever other container I want to use? I have never used arrays to store data so excuse me if this is either blatantly obvious or a stupid question.

It's not very clear to me what you want to do... you want to perform some operations on every record?? because the variable group is going to contains just that, every record that is in @groups — Alejandro Montilla
– Alejandro Montilla, Commented Dec 21, 2017 at 17:06
If multiple forms have the same group_id I need them to be listed under one card. If I try and call @group.location I get this error undefined method location' for #<Array:0x007fa2554a9670> — Trenton Tyler
– Trenton Tyler, Commented Dec 21, 2017 at 17:11

MrYoshiji · Accepted Answer · 2017-12-21 17:11:23Z

1

When you have a hash, like { key: 'value', other_key: 'other_value' }, you can use each as the following:

# in rails console
h = { some_key: 'value', other_key: 'other_value' }
h.each do |k, v|
  puts "the value for key #{k.inspect} is #{v.inspect}"
end
# it will output:
the value for key :some_key is "value"
the value for key :other_key is "other_value"

So in your case, you can simply do:

@groups.each do |group_id, pdforms|
  # group_id is the key (ex: "DSC-002")
  # pdforms is the value for that key (in your case: an array of Pdform records)

  # in this loop you can then cycle through all `pdforms`:
  pdforms.each do |pdform|
    # do something with a single Pdform record
  end
end

answered Dec 21, 2017 at 17:11

MrYoshiji

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