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Both of those methods are helpers to create an HTML input tag of type "hidden", and yes, those are used to add parameters to a request Try using this Ref hidden_field or hidden_field_tag hidden_field and hidden_field_tag are not the same. You want the latter. hidden_field works like text_field and so requires an object (usually inside a The mass-assign error is happening because you are passing :rfid_tag as part of the params[:device] attribute hash I tried numerous variations of passing values via form_for to a hidden field. Question 1: How to pass the value so I can get at it when the user Hi please test with following code to send hidden value in rails, I have tried and worked for one of my application For a generic model object, a form can be created by passing . automatically includes the model id as a hidden field in the form. This is Ruby on Rails latest stable (v4.2.7) - 3 notes - Class: ActionView::Helpers::FormHelper Returns a hidden input tag tailored for accessing a specified attribute I would use this technique. <% @user.roles.each do |role| %> <%= f.hidden_field form_for @user do |f| -%> <%= f.hidden_field :role_ids, :value => @user.roles.map(&:id) %>. When I submit my edit form, I receive an error:
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