###### tags: `Template Notes` `Java`

# WOS - Part 4 Starter Template
---
- Now we can get all and post and even show our validation errors. Next we need to finish our CRUD opperation.
- Get One
- Edit
- Delete

## Get One:
- This is for displaying the view and edit pages

### jsp page showing all the link

<a href="/pet/${ pet.id }/view">View</a>

### view jsp
- However you chose to call the variable in the controller is how you will call the parts here

${ pet.name }

### edit jsp
- Here we will have a form that will be prefilled with the current data

### Controller file edits for get one:
- These are the edits for view and or edit using a get one

	@GetMapping("pet/{id}/view")
	public String viewPet(@PathVariable Long id, Model model) {
		model.addAttribute("pet", petService.getOne(id))
		return "profile.jsp";
	}

### Service file edits for get one:

	public Pet getOne(Long id) {
		
		return petRepository.findById(id).orElse(null);
	}

## Updating:
- Here we will need to add the required functions and pages to render a form that is prepopulated with the current data for the single instance and then allow us to hit submit and send the changes to the database

### jsp file:

		<form:form action="/pet/${ pet.id }/update" method="POST" modelAttribute="editPet">
			<input type="hidden" name="_method" value="put" />
			<section>
				<form:label path="name" class="form-label">Name</form:label>
				<form:input path="name" class="form-control" type="text" value="${ pet.name }" />
				<form:errors path="name" class="text-bg-danger" />
			</section>
			<section>
				<form:label path="species" class="form-label">Species</form:label>
				<form:input path="species" class="form-control" type="text" value="${ pet.name }" />
				<form:errors path="species" class="text-danger" />
			</section>
			<section>
				<form:label class="form-label" path="gender">Gender</form:label>
				<section>
					<form:label path="gender" class="form-label">Female</form:label>
					<form:radiobutton class="form-check-input" lable="Female" path="gender" value="1"/>
				</section>
				<section>
					<form:label path="gender" class="form-label">Male</form:label>
					<form:radiobutton class="form-check-input" lable="Male" path="gender" value="0"/>
				</section>	
			</section>
			<section>
				<form:label path="age" class="form-label">Age</form:label>
				<form:input path="age" class="form-control" type="number" value="${ pet.name }" />
				<form:errors path="age" class="text-danger" />
			</section>
			<button class="btn btn-primary">Submit</button>
		</form:form>

### Controller file:
- The rendering of the edit page looks just like the view with the change of the mapping we just need to now add the update function

	@PutMapping("pet/{id}/update")
	public String updatePet(@Valid @ModelAttribute("editPet") Pet editPet, BindingResult result, Model model) {
		
		if(result.hasErrors()) {
			model.addAttribute("editPet");
			return "editPet.jsp";
		}
		petService.update(editPet);
		
		return "redirect:/";
	}

### service file:
- Since we are using the same getOne function for the rendering of the edit page we just need to add the update function

	public Pet updae(Pet editPet) {
		return petRepository.save(editPet);
	}

## Deleting:
- Here we are going to create the way to delete a single item from the database

### jsp file:
- Convention want you to put a link like our edit and view links however that can allow items to be deleted via the address bar.
- Instead we will use a form here

		<form action="/pet/${ id }/delete" method="POST">
			<input type="hidden" name="_method" value="delete" />
			<input type="submit" value="Delete" class="btn btn-warning" />
		</form>

### Controller file:

	@DeleteMapping("/pet/{id}/delete")
	public String deletePet(@PathVariable Long id) {
		
		petService.deleteOne(id);
		
		return "redirect:/";
	}

### Service file:

	public void deleteOne(Long id) {
		
		petRepository.deleteById(id);
	}