如何传递多个参数以在 Rails 中渲染？

Question

Below is my review.html.erb:

<% provide(:title, 'All reviews') %>
<h1>All reviews</h1>

<ol class="reviews">
  <%= render @reviews %>
</ol>
<%= will_paginate @reviews %>

And my _review.html.erb looks like:

<li>
   <p>Student: <%= Student.find(review.student_id).name%></p>
   <p>Score: <%= review.score%></p>
   <p>Review: <%= review.review%></p>
   <p>Created at: <%= review.created_at%></p>
</li>

How can I pass @students as well to render for example?

I tried <%= render @reviews, @students %> in review.html.erb and

Student: <%= student.name%>

in _review.html.erb. It didn't work.

Answer 1

You don't actually need to pass multiple parameters. You just need to setup the assocations between reviews and students:

class Student < ApplicationRecord
  has_many :reviews
end

class Review < ApplicationRecord
  belongs_to :student
  # optional but avoids a law of demeter violation
  delegate :name, to: :student, prefix: true
end

<li>
   <p>Student: <%= review.student_name %></p>
   <p>Score: <%= review.score %></p>
   <p>Review: <%= review.review %></p>
   <p>Created at: <%= review.created_at %></p>
</li>

To avoid a N+1 query issue you should use includes or eager_load to load the student with the reviews:

@reviews = Review.includes(:student)
                 .all

If you do actually want to pass additional arguments when rendering a collection (which isn't needed here) you do it with local assigns:

<%= render @reviews, locals: { foo: 'bar' } %>

This will be available in the partial as foo or local_assigns(:foo) .

Answer 2

• Reivew table and students are related

In _review.html.erb , you don't need use Student.find(review.student_id)

<li>
   <p>Student: <%= review.student&.name%></p> // changed
   ....
</li>