Learn Ruby on Rails: Learn Ruby on Rails Series Part 7

Create an active Pada record

Next, to create a system or add data, we will do

1. Create a folder on application/views by name categories and create a file with the name new.html.erb And _form.html.erb in the created folder.
   
   Remarks :
   The _form.html.erb file we create partial. In Rails, partial file names must be preceded by a sign emphasize.
2. Try to start the server by running the command
3. On file categories_controller.rb add the following script.
4. On file _form.html.erb add the following script.
5. Add script to file new.html.erb as follows.

After creating a process to display a new page, we will then create a process to save the data entered from that page.

1. On the method create Of categories_controller.rb add the following script.
   Here is an explanation of the script:

   @category = Category.new(params.require(:category).permit(:name))
   

   Explanation:

   • Do instantiation has Model Categorywhere to instantiate this requires category parameter.
   • This parameter is found on the form new.html.erb. And this data allowed this is data name just.

   respond_to do |format| 
     if @category.save
       format.html { redirect_to "/categories/new", notice: "Category was successfully created." }
     else
       format.html { redirect_to "/categories/new", notice: "Category wasm't successfully created." }
     end
   end
   

   Explanation:
   

   • answer_to do useful for execute commands save data using web services support. This tag is useful for displaying response results in HTML format.
   • If the data is held by variables @category successfully registeredFor displays text in the form of the category name added successfully and return to the add data page
   • If not registered successfullywill displays text that the category name was not added successfully and return to the add data page.

   We’re doing tests, we’re trying to capture data physical in the text field, as follows.

   

   Try clicking the Create Category button. If the data is saved successfully, the screen will appear as follows.

   

Read active pada recording

Next, for the system to display all the category data that has been entered, we will do

1. Create a file with the name index.html.erb in the file application/views/categories.
   
2. Try to start the server by running the command
3. On file index.html.erb add the following script.
4. Then run the URL again in the browser. So, on this page, the display that will appear is as follows.
   
   

   Remember again that in the previous module i.e. Part 6 – Creating tables and dummy data, we added data to the category table via seeding in Rails. the data consist of Mathematics, history, Indonesian, English, Japanese, religion, chemistry and biology.

   While Physical are data added via the form.

What we do is display all category data, and what if we want to display specific category data. The measures taken are:

1. Create a file with the name show.html.erb in the file application/views/categories. Add the following script.
2. On categories_controller.rb method to showadd the following script.
   
3. Try to start the server by running the command

   $ rails s

   and open the url and click the Show link on any of the data. So on this page the display that will appear is as follows

   

Update active record pada

Next, to create a system for modifying category data, we will do

1. Create a file with the name edit.html.erb in the file application/views/categories. Add the following script.
2. On categories_controller.rb method to modifyadd the following script.
   
3. Try to start the server by running the command

   $ rails s

   and open the url and click the edit link on any of the data. So on this page the display that will appear is as follows

   

   We have just reached the display stage of displaying data changes. Next, we add a script to perform the data modification process.

   On categories_controller.rb method updateadd the following script.

   Now try to edit the data on the edit data page. If you perform the steps correctly, the data will definitely be modified successfully.