[RUBY] Implement the star five function using the for statement

1. Prepare a column

Here's how to implement a 5-star rating on your store and meal posts! !! First, prepare a column to store the number of stars. Create an integer column named star.

rails g migration AddStarToPosts star:integer

The migration file is below.

class AddStarToPosts < ActiveRecord::Migration[5.1]
  def change
    add_column :posts, :star, :integer
  end
end

I will migrate.

rails db:migrate

Check the schema of db and put it in the posts table

schema.rb

t.integer "star"

If it is written, it's OK!

2. Edit new page

We will be able to send the number "2" for 2 stars and "5" for 5 stars. Anything is fine as long as you can send a numerical value, but here we will implement it with radio.

html:posts/new.html.erb

<%= form_for @posts do |f| %>
  <div class="field">
  <p>
    <%= f.label :name %>
    <%= f.text_field :name %>
   
  </p>
<-!Added part->
  <p>
5 star rating:
    <label><%= f.radio_button :star, 1 %> 1</label>
    <label><%= f.radio_button :star, 2 %> 2</label>
    <label><%= f.radio_button :star, 3 %> 3</label>
    <label><%= f.radio_button :star, 4 %> 4</label>
    <label><%= f.radio_button :star, 5 %> 5</label>
   </p>
<-!So far->
  </div>
  <%= f.submit "POST IT!" %>
<% end %>

3. Fix the controller

If you are using an action to receive a parameter in the create action, Let's add a star column

posts_controller.rb

private
  def post_params
    params.require(:posts).permit(:name,:star)
  end

4. Write stars on the Index page

Finally, the for statement will display the stars! !!

html:posts/index.heml.erb

<% @posts.each do |t| %>
   <div class="index-name">
        <%= t.name %>
   </div>
   <-!Additional points->
   <div class=“star-bar”>
　　　<%for i in 1..t.star do%>
        ★
　　　<%end%>
　　</div>
   <-!Additional points->
<%end%>       

This completes the five-star function! !!