126. Passing Ingredients from Recipes to the Shopping List (via a Service)

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

In the last lecture,

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we added some ingredients.

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Now I want you to make this to shopping list button work.

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You can come up with some ideas,

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

some solution on how you can send these items to

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the shopping list so that once we go to the shopping list,

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we see them here.

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Think about informing the component that something changed.

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And also think about how to add more than

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one item at once to the shopping list.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

I wish you luck with that.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

Time to pause.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

In a couple of seconds,

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we'll do it together.

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S… Speaker 1 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

So,

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were you successful?

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Let's add the shopping list items together.

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We already have this button in the recipe

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detail component.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

So the first step,

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

of course, is to hook this button up.

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I will remove the ref here and instead

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add an inline style to still have a cursor,

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which looks like a pointer.

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But then here on the click listener,

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I'll call on add to shopping

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list.

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S… Speaker 1 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

Of course,

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you can choose a different name.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

Now that will be executed here in the

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component body in the recipe detail component TypeScript file.

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And here,

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We either need to get access to the shopping list service or

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to the recipe service.

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And then the recipe service accesses the shopping list service.

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You can find arguments for both.

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You could say we're in the recipe section,

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therefore we should mainly work with the recipe service.

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S… Speaker 1 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

You could say,

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why would we take this extra...

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

way this extra step we can directly access the shopping list service again

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

arguments can be found for both directions i will choose the route where

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we use the recipe service so i will inject the

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recipe service here type recipe service

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

of course make sure to add the import and now i need to add a

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method in the recipe service this is the

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

add ingredients to shopping list method.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

Of course, you can also pick a shorter name if this one is a bit too long for you.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

Here,

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

I expect to receive my ingredients.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

So that will be of type ingredients.

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And before we continue working on this in the recipe service,

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let's call this method.

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So in the shopping,

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S… Speaker 1 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

excuse me,

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in the recipe detail component,

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I will access my recipe service,

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call this brand new method with the extremely short name and

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pass on the ingredients of this

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recipe here.

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So these ingredients.

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So with that,

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these ingredients are passed to the recipe service.

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Now here we need to access the shopping list service.

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Now, for that,

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we need to get access to the shopping list service in this file.

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And if you want to inject a service into a service,

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as we want to do here,

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you need to add injectable to that service.

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Make sure to import it from at AngularCore.

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With that added here,

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we can inject the service now in the constructor of this

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recipe service class.

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Here I'll add the sl service,

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so the shopping list service,

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to which you'll need to add an import at the top,

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pointing to the shopping list folder and then the shopping list service file.

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And with that added,

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we can now reach out to that here,

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sl service,

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and here we need to add a new method.

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So let's go to the shopping list service.

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And let's add a add ingredients method

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like that.

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Now in here,

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we will receive our list of ingredients.

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So of type ingredient array.

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And now we need a logic to add them.

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Now a quick and easy way would be to simply loop through

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them. So let ingredient of ingredients,

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whoops,

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ingredients like that.

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And then we could simply call this add ingredient

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for each ingredient.

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And that would be absolutely fine.

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The only downside probably is that we emit a lot

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of events.

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Now, it won't be too bad because even a recipe with like 30

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ingredients wouldn't blow up our app.

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But still,

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there are a lot of unnecessary event emissions.

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So that is a viable option,

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but I'll comment it out.

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A different one would be to directly add all

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ingredients in one go and then emit our event.

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So we could access our ingredients here

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and call the push method.

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And now we can use a ES6 feature,

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the spread operator,

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which allows us to basically turn an array of elements

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into a list of elements.

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because the push method here is able to handle multiple objects.

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However, it is not able to handle an array.

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Or to be precise,

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it can handle an array,

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but then it would push this array as a single object to the other

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array. So by adding the spread operator,

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which is simply three dots,

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might look strange,

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but that is how the operator looks,

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we can now simply spread our ingredients into a list of single

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ingredients, which are now pushed without issues to our ingredients array.

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And then,

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don't forget it,

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we have to emit

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that our ingredients changed,

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so why don't we simply pass a copy of it?

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So with that now,

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we got a method we can call addIngredients.

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So back in the recipe service,

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on the shopping list service,

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we can now call add ingredients and pass our ingredients to that

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service.

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With that,

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let's save this and let's simply check this.

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Right now,

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we only have the default values of apples and tomatoes on our shopping

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list.

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Now on the schnitzel,

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we got meat and french fries.

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Let's click to shopping list and let's go to the shopping list

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and we see meat and french fries.

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Awesome. That looks really great.

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Of course, if you click this multiple times,

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it will duplicate it.

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S… Speaker 2 (126. Passing Ingredients from Recipes to the Shopping List (via a Service))

And you can,

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of course, write some logic to check if an item has already been added

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and then group it together by name.

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I won't do this in this application.

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The main thing here is it works.

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We can send data around through our app by using

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services.

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We took a major step forward.

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Now,

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in the next section,

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we're going to have a look at routing.

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And thereafter,

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we're going to add routing to this application to now get

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a proper navigation and also to make this new recipe

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button here work.

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So see you there.

126. Passing Ingredients from Recipes to the Shopping List (via a Service)

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