Step 1: Setting Up Your Supabase Project

• Go to the Supabase website and log in to your account or sign up if you don’t have one yet.
• Create a new project and give it a meaningful name.
• Take note of the Project URL and Project Key as you will need these for authentication in your application.

Step 2: Configure the Database

• From the Supabase dashboard, navigate to the "Database" tab.
• Click on "Tables" and create a new table called reviews.
• Define the columns for the reviews table:

  <ul>
    <li><code>id</code>: UUID, Primary Key</li>
    <li><code>user\_id</code>: UUID, Foreign Key tying to your Users Table</li>
    <li><code>product\_id</code>: UUID, Foreign Key if you're rating specific products</li>
    <li><code>rating</code>: Integer (values typically between 1 and 5)</li>
    <li><code>comment</code>: Text</li>
    <li><code>created\_at</code>: Timestamp with time zone</li>
  </ul>
  

• Ensure foreign key constraints are properly set up to maintain referential integrity.

Step 3: Setting Up Supabase Client in Your Application

• Install the Supabase client in your project:

  <ul>
    <li>If you are using a Node.js environment: <code>npm install @supabase/supabase-js</code></li>
    <li>For other environments, refer to the Supabase documentation for specific instructions.</li>
  </ul>
  

• Initialize the Supabase client with your Project URL and Key:

  <ul>
    <li>
      <code>
        import { createClient } from ‘@supabase/supabase-js’;<br>
        const supabaseUrl = ‘YOUR_SUPABASE_URL’; <br>
        const supabaseKey = ‘YOUR_SUPABASE_KEY’; <br>
        const supabase = createClient(supabaseUrl, supabaseKey);
      </code>
    </li>
  </ul>
  

Step 4: Authenticating Users

• Supabase provides built-in support for user authentication:

  <ul>
    <li>Configure your authentication settings from the Supabase dashboard.</li>
    <li>In your application, add logic to authenticate users (e.g., sign-up, login, logout) using Supabase auth methods:
  
      <ul>
        <li><code>supabase.auth.signUp({ email, password })</code></li>
        <li><code>supabase.auth.signIn({ email, password })</code></li>
      </ul>
    </li>
  </ul>
  

• Ensure you're saving the user session properly to make authenticated requests when submitting a review.

Step 5: Creating Review Submission Form

• Design a form in your front-end application for users to submit reviews.
• The form should collect necessary inputs such as rating, comment, and optionally a product identifier.
• Handle form submission by sending the data to Supabase. Example code:

  <ul>
    <li>
      <code>
        async function submitReview(rating, comment, productId) {<br>
          const user = supabase.auth.user();<br>
          const { data, error } = await supabase<br>
            .from('reviews')<br>
            .insert([<br>
              { user_id: user.id, rating, comment, product_id: productId, created\_at: new Date() }<br>
            ]);<br>
          if (error) console.log('Error:', error);<br>
          else console.log('Review submitted', data);<br>
        }
      </code>
    </li>
  </ul>
  

Step 6: Displaying Reviews and Ratings

• Fetch reviews from the database to display them on your site. Example code:

  <ul>
    <li>
      <code>
        async function fetchReviews(productId) {<br>
          const { data, error } = await supabase<br>
            .from('reviews')<br>
            .select('\*')<br>
            .eq('product\_id', productId);<br>
          if (error) console.log('Error:', error);<br>
          else return data;<br>
        }
      </code>
    </li>
  </ul>
  

Step 7: Integrate Real-Time Updates

• Leverage Supabase's real-time capabilities to update reviews without refreshing the page:
• Subscribe to changes in the reviews table:

  <ul>
    <li>
      <code>
        supabase.<br>
          from('reviews')<br>
          .on('INSERT', payload => {<br>
            console.log('New Review:', payload.new);<br>
            // Update your UI here with the new review<br>
          })<br>
          .subscribe();
      </code>
    </li>
  </ul>
  

Step 8: Adding Security Rules

• Ensure that only authenticated users can submit reviews and that users can only delete or update their own reviews:
• Navigate to the "Policies" tab in the Supabase dashboard and create Row Level Security (RLS) policies for the reviews table. Example:
• Policy for inserting reviews:

  <ul>
    <li>
      <code>
        ENABLE ROW LEVEL SECURITY;<br>
        CREATE POLICY "Allow authenticated users to insert reviews"<br>
        ON public.reviews<br>
        FOR INSERT<br>
        WITH CHECK (auth.uid() = user\_id);
      </code>
    </li>
  </ul>
  

• Policy for updating/deleting reviews:

  <ul>
    <li>
      <code>
        CREATE POLICY "Allow users to update/delete their own reviews"<br>
        ON public.reviews<br>
        FOR UPDATE, DELETE<br>
        USING (auth.uid() = user\_id);
      </code>
    </li>
  </ul>