simple_form accept a hash for collection input - ruby-on-rails

Question

Current behavior
With simple_form you need to pass an array:
<%= f.input :my_field, collection: [[true,"Yes"],[false,"No"]] %>
Expected behavior
It would be nice to be able to pass a hash, so you do not need to do invert.sort on every hash passed. Is there any way to do this for every input?
<%= f.input :my_field, collection: {"true"=> "yes", "false"=>"No" } %>
Is it possible to pass a hash directly into the input without invert.sort?

Answer 1

You can add your own helper my_simple_form_for to use your own YourFormBuilder
module ApplicationHelper
def my_form_for record, options = {}, &block
options[:builder] = MyFormBuilder
simple_form_for(record, options, &block)
end
end
Or just use it in this way:
<%= simple_form_for #record, builder: MyFormBuilder do |f| %>
In your own builder you can overwrite input:
class YourFormBuilder < SimpleForm::FormBuilder
def input(attribute_name, options = {}, &block)
options[:collection] = options[:collection].invert.sort if options[:collection].present? and options[:collection].kind_of? Hash
super
end
end

Answer 2

Based on our earlier Q&A, you could enhance the Hash extension to include as_select_options:
module DropdownExt
def self.extended(receiver)
receiver.each do |k,v|
define_method(k) do
v.is_a?(Hash) ? v.extend(DropdownExt) : v
end
end
define_method(:as_select_options) do
unless receiver.values.map{|v|v.class}.include?(ActiveSupport::HashWithIndifferentAccess)
receiver.invert.sort
else
[]
end
end
end
end
class Dropdowns
class << self
private
def dropdowns_spec
YAML.load_file("#{path}").with_indifferent_access
end
def path
Rails.root.join("spec/so/dropdowns/dropdowns.yaml") # <== you'll need to change this
end
end
dropdowns_spec[:dropdown].each do |k,v|
define_singleton_method k do
v.extend(DropdownExt)
end
end
%i(
truck_model
bike_model
).each do |to_alias|
singleton_class.send(:alias_method, to_alias, :car_model)
end
end
Which would let you do something like:
Dropdowns.car_model.field1.as_select_options
=> [["false", "no"], ["true", "yes"]]
Or, I suppose:
<%= f.input :my_field, collection: Dropdowns.car_model.field1.as_select_options %>
It doesn't avoid invert.sort. But, it does bury it a little bit and wrap it up in a convenient as_select_options method.