Inputs with dry-validation v1

controller.rb

def new
  # initialize a hash from 
  @inputs = { 
    user_name: '',
    some_field: some_object.default_some_field,
    something: {
      a: '',
      b: 'some default value'
    }
  }
end
 
def create
  create_user = CreateUserTransaction.new
  
  create_user.call(params) do |result|
  result.success do |outcome|
    #..
    redirect...
  end

  result.failure do |outcome|
    flash.now[:error] = outcome[:description]
    @inputs = outcome[:validation] # <- params and validation errors here
    render :edit
  end
end


def edit
  @inputs = { 
    user_name: user.name,
    some_field: user.some_field,
    something: {
      a: something.a,
      b: something.b
    }
  }
end

def update
  # similar to #create
end

validation_schema.rb

class CreateUserContract < Dry::Validation::Contract
  params do
    required(:user_name).filled
    required(:some_field).filled { Types::Retail::Url.rule }
    required(:something).hash do
      required(:a).filled
      required(:b).filled
    end
  end
end

view.rb

<input name="user_name" type="text" value="<%= inputs[:user_name] %>" />
<input name="some_field" type="text" value="<%= inputs[:some_filed] %>" />

<h3>Something</h3>
<input name="user_name[something][a]" type="text" value="<%= inputs[:something][:a] %>" />
<input name="user_name[something][b]" type="text" value="<%= inputs[:something][:b] %>" />