[RUBY] [Rails] How to get the contents of strong parameters


How to write a process to extract the contents of strong parameters in Rails

Situations that use this method

Editing screen ↓ Editing content confirmation screen ↓ Completion screen

For some reason, in the screen transition When you want to display the value of the strong parameter on the edit content confirmation screen, etc.

Prior knowledge

What are strong parameters? https://qiita.com/ozackiee/items/f100fd51f4839b3fdca8

Implementation example

Editing screen


<!--name and email are submitted from the input form to the confirmation screen-->
<!--It is an edit about the created user, and its ID value shall be passed separately as a URL parameter.-->
<%= form_with(model:@user, url: confirm_user_path) do |f| %>
<div class="field">
  <%= f.text_field :name, placeholder: "Enter your username!" %>
<div class="field">
  <%= f.text_field :email, placeholder: "e-Please enter your mail address!" %>
<div class="actions">
  <%= f.submit %>
<% end %>

Strong parameters in the controller


//Define strong parameters
 def user_params
            params.require(:user).permit(:name, :email)

Variable definition for confirmation screen display in the controller


def edit_confirm
    @user = User.find(params[:id])  #Get user data with the ID obtained from the URL parameter(Example: users/3/edit_confirm)
    @user.name = user_params[:name] #Extracting the value of a strong parameter & assigning it to a variable
    @user.email = user_params[:email] #Same as above

confirmation screen


    <h2>Confirmation of edited contents</h2>
    <p>Full name:<%= @user.name %>Mr.</p>
    <p>mail address:<%= @user.email %></p>

Why i wrote this article

Regarding how to create a "confirmation screen", in Qiita articles etc., it is often


@user = User.new(user_params)

And set it on the template side


    <h2>Confirmation of edited contents</h2>
    <p>Full name:<%= @user.name %>Mr.</p>
    <p>mail address:<%= @user.email %></p>

But in my case Because I set a certain validation for the create action When I ran User.new, it was recognized as a create action and I was getting a validation error. I wonder if strong parameters can be used to display the input contents on the confirmation screen while avoiding it. When I tried it, I was able to get it and assign it to a variable by the above method.

I'm glad if you can use it as a reference.

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