Simple form text input fields as part of an array

Question

So I have 3 text input fields and each one represents a co-ordinate and they are stored in the array format [x, y, z] in my model.

I am trying to use the input fields to work together to produce an array submitted with the form. My code currently:

=f.input_field :coordinates[0], value: "1"
=f.input_field :coordinates[1], value: "2"
=f.input_field :coordinates[2], value: "3"

So my hoping is that I can use the coordinates param in the controller to save it to the database. The issue is that with this setup the html produced is <input value="1" name="shape[o]" id="shape_o"> when it should be <input value="1" name="shape[coordinates][]" id="shape_coordinates_0">

N.B. I already have serialize :coordinates in the model

Ilya · Accepted Answer · 2016-04-21 19:59:49Z

1

Try to set your custom attributes directly like this:

= f.input_field :coordinates, input_html: { value: 1,
                                            id: "shape_coordinates_0", 
                                            name: "shape[coordinates][]" }

But I suggest to create attr_readers in your model for each coordinate and then unite it in array:

# model:
class Shape < ActiveRecord::Base
  attr_reader :x, :y, :z #since you want to serialize it

  before_create :build_coordinates

  private

  def build_coordinates
    self.coordinates = [x, y, z]
  end
end

In this case your view will look much easy like:

=f.input_field :x, value: "1"
=f.input_field :y, value: "2"
=f.input_field :z, value: "3"

edited Apr 21, 2016 at 19:59

answered Apr 21, 2016 at 19:44

Ilya

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