What is Database views Record?

• A database view is “the result set of a stored query which users can query just as they would in a persistent database collection.”
• One of the side affects of the above statement with respect to ActiveRecord is that when an application model extends ActiveRecord::Base it doesn’t care if the collection it’s modelling is a table or a view.
• This means an application can put the query logic into the database, and keep the application source code lighter weight.

learn ruby on rails - view record - ruby on rail example

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We will see an example to view data in an application:

Step 1 Create a new Rails application.

rails new viewrecord  

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Step 2 Change your directory to save.

cd viewrecord  

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Step 3 Create a controller from the console.

rails g controller products index show new create destroy  

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Step 4 Create a model from the console.

rails g model product name:string price:decimal short_description:text full_description:text  

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class ProductsController < ApplicationController   
    
  # GET method to get all products from database   
  def index   
    @products = Product.all   
  end   
    
  # GET method to get a product by id   
  def show   
    @product = Product.find(params[:id])   
  end   
    
  # GET method for the new product form   
  def new   
    @product = Product.new   
  end   
    
  # POST method for processing form data   
  def create   
    @product = Product.new(product_params)   
    if @product.save   
      flash[:notice] = 'Product added!'   
      redirect_to root_path   
    else   
      flash[:error] = 'Failed to edit product!'   
      render :new   
    end   
  end   
  
  def destroy   
    @product = Product.find(params[:id])   
    if @product.delete   
      flash[:notice] = 'Product deleted!'   
      redirect_to root_path   
    else   
      flash[:error] = 'Failed to delete this product!'   
      render :destroy   
    end   
  end   
     
 def product_params   
    params.require(:product).permit(:name, :price, :old_price, :short_description, :full_description)   
  end   
   end   

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Step 6 Run the following command:

bundle install  

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Step 7: Go to app/views/products/index.html.erb file.

<h3>STOCK LIST</h3>   
      
      <div>   
        <%= link_to 'Add Product', new_product_path %>   
      </div>   
      <br>   
      
     <table class="table table-bordered table-striped">   
       <tr>   
        <th>Name</th>   
        <th>Price</th>   
        <th>Description</th>   
          
      </tr>   
       
      <% @products.each do |product| %>   
          <tr>   
            <td><%= product.name %></td>   
            <td><%= product.price %></td>   
            <td><%= truncate(product.short_description, :length => 75) %></td>   
                <td><%= link_to 'Delete', product_path(product), method: :delete %></td>   
              
           </tr>   
      <% end %>   
    </table>  

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Step 8: Go to app/views/products/new.html.erb file.

<%= form_for @product, url: {action: :create} do |f| %>   

<h3>Add a Product</h3>   

<div class="field">   
<%= f.label :name %>   
<%= f.text_field :name %>   
</div>   

<div class="field">   
<%= f.label :price %>   
<%= f.text_field :price %>   
</div>   
        <div class="field">   
           <%= f.label :short_description %>   
              <%= f.text_field :short_description %>   
        </div>   
         </p>   
      </div>   
      <div class="actions">   
        <%= link_to 'Back', { controller: 'products', action: 'index'} %>   
        <%= f.submit 'Create Product' %>   
      </div>   
  <% end %>   
</div>  

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Step 9 Start the server.

rails s  

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Step 10 Run it on localhost.

http://localhost:3000/products  

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learn ruby on rails - rails view data- ruby on rail example

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