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    <p>Mass assignment is correct. You would create or update a model by passing <code>params[:your_models_name]</code> to <code>YourModel.new</code> or <code>YourModel.find(params[:id]).update_attributes params[:your_model]</code>. Strong parameters is a way to whitelist the params that can be mass assigned. </p> <p><a href="http://edgeapi.rubyonrails.org/classes/ActionController/StrongParameters.html" rel="nofollow">From the guides:</a></p> <pre><code>class PeopleController &lt; ActionController::Base # Using "Person.create(params[:person])" would raise an # ActiveModel::ForbiddenAttributes exception because it'd # be using mass assignment without an explicit permit step. # This is the recommended form: def create Person.create(person_params) end # This will pass with flying colors as long as there's a person key in the # parameters, otherwise it'll raise an ActionController::MissingParameter # exception, which will get caught by ActionController::Base and turned # into a 400 Bad Request reply. def update redirect_to current_account.people.find(params[:id]).tap { |person| person.update!(person_params) } end private # Using a private method to encapsulate the permissible parameters is # just a good pattern since you'll be able to reuse the same permit # list between create and update. Also, you can specialize this method # with per-user checking of permissible attributes. def person_params params.require(:person).permit(:name, :age) end end </code></pre> <p>In the above example if the params that came in looked like this: </p> <pre><code>{ person: { name: 'bob', age: 30, admin: true } } </code></pre> <p>Then the <code>admin: true</code> param would not have been assigned to bob's Person.</p> <p>As for your input field format question, they should come in however they were on the form. Is this not the case for you?</p>
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    1. COthanks, this is for whitelist attributes, but it's not perfect for reformatting all numeric attributes, it's better to define some write_attribute methods, see updated answer.
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