Rails convert string data received from front-end to Boolean in the backend

Question

I have a drop down menu from front end whose value are"true" and "false" as a string respectively.

  {label: 'No', value: 'false'},
  {label: 'Yes', value: 'true'}

They will be insert into a column type with Boolean type.

As you can see, it may be problematic because the type mismatch.

The error i got in the console:

POST http://localhost:3000/api/my_forms.json 422 (Unprocessable Entity)

So is there a efficient way so that once the data is received,it will l be converted into Boolean

I am using Postgresql for my DB and React for my front-end, if that helps.

it is, I am encountering an error while trying to save a form and i ran into an :unprocessable_entity error — ZpfSysn
– ZpfSysn, Commented Mar 6, 2018 at 16:26
Interesting. It would likely be helpful, then, to include the error trace, etc. with your question. BTW, you might find this Q&A helpful. — jvillian
– jvillian, Commented Mar 6, 2018 at 16:32
@jvillian I will try to put a byebug in between so i can get a trace of it. — ZpfSysn
– ZpfSysn, Commented Mar 6, 2018 at 16:50

Ben · Accepted Answer · 2018-03-06 18:44:49Z

1

if it is effectively passed as a string, you could add a callback in your model to ensure the value is correctly transformed

For example :

class YourModel
  before_validation :format_field,
                    if: proc { |model|
                      model.your_field.is_a?(String)
                    }
  def format_field
    your_field = (your_field == "true")
  end
end

Or a before action on your controller :

before_action :format_problematic_field
def format_problematic_field
  return unless params[:your_field].is_a?(String)
  params[:your_field] = params[:your_field] == "true"
end

answered Mar 6, 2018 at 18:44

Ben

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