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The create() function inserts a new record into the table. Because this model function flows from a specified model, it will insert into said model. In line 3 of Listing 6-3, the create() function is being called from the Post model, so the new row will be inserted in the posts table. Running the save() function immediately following the create() function will propagate whatever is passed for saving to the new row. Line 4 in Listing 6-3 sends the preformatted $this->data array. The save() function is already built to parse and save the array, so no other data handling is needed. In short, the first step for adding a new record is to create a new row with the create() model function, and the second step is to save $this->data by passing it through the save() model function. The baked Add action goes beyond just saving the data by checking for an error in the process. You could intercept the save function by entering some logic in the beforeSave() model action. If this action returns false, then in the controller (line 4 in Listing 6-3, for example) the save() model function also returns false. The controller can then use the Session component to display an error message or perform other operations in response to a failed save in the model. Saving form data for a specific ID is done by setting the model ID variable, as in the following example: $this->Post->id = $id; $this->Post->save($this->data); This is usually necessary only for updating a record. When creating a new record, use the create() model function.

Figure 4-21. Choosing from a list of pages This trick won t work if you have a Default.aspx page. If you do, any requests that don t indicate the page you want are automatically redirected to this page.

Single-step debugging allows you to test your assumptions about how your code works and see what s really happening under the hood of your application. It s incredibly easy to use. Just follow these steps: 1. Find a location in your code where you want to pause execution. (You can use any executable line of code but not a variable declaration, comment, or blank line.) Click in the margin next to the line of code, and a red breakpoint will appear (see Figure 4-22). 2. Now start your program as you would ordinarily (by pressing the F5 key or using the Start button on the toolbar). When the program reaches your breakpoint, execution will pause, and you ll be switched to the Visual Studio code window. The breakpoint statement won t be executed yet. 3. At this point, you have several options. You can execute the current line by pressing F8. The following line in your code will be highlighted with a yellow arrow, indicating that this is the next line that will be executed. You can continue like this through your program, running one line at a time by pressing F8 and following the code s path of execution.

Figure 4-22. Setting a breakpoint 4. Whenever the code is in break mode, you can hover over variables to see their current contents (see Figure 4-23). This allows you to verify that variables contain the values you expect.

1. Click Tools Solver. 2. Click Set Target Cell, and then click cell B3. 3. Click Value Of, and then type 40 in the Value Of box. 4. Click Guess. 5. Click Add.

The form submission sequence may also include editing records in the database or previously saved data. In this instance, the controller will need to include a few more operations than the Add action does. Open the app/controllers/posts_controller.php file and scroll to the Edit action. It should include code similar to Listing 6-5.

Figure 4-23. Viewing variable contents in break mode 5. You can also use any of the commands listed in Table 4-2 while in break mode. These commands are available from the context menu by right-clicking the code window or by using the associated hot key.

Command (Hot Key)

Step Into (F8)

Listing 6-5. The Edit Action in the Posts Controller 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 function edit($id = null) { if (!$id && empty($this->data)) { $this->Session->setFlash(__('Invalid Post', true)); $this->redirect(array('action'=>'index')); } if (!empty($this->data)) { if ($this->Post->save($this->data)) { $this->Session->setFlash(__('The Post has been saved', true)); $this->redirect(array('action'=>'index')); } else { $this->Session->setFlash(__('The Post could not be saved. Please try again.', true)); } } if (empty($this->data)) { $this->data = $this->Post->read(null, $id); } $tags = $this->Post->Tag->find('list'); $users = $this->Post->User->find('list'); $this->set(compact('tags','users')); }