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Item by plane.



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Hello, guys.



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Today, we're going to talk about pipelines and the easiest way to explain why this pipeline is if you



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imagine that after an item has been scrapped by the spider, it is immediately sent to the pipeline,



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which produces a fight with several components.



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So each pipeline component is actually a patent class that implements a simple metals.



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So the pipelines basically receive an item and perform an action over it.



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And they won't have the function and the option to decide if the item either has to continue through



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the pipeline or actually be dropped away.



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OK, so they have some mechanism over them, but we're going to show this in that video for sure.



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So the pipelines are usually used to clean HTML data who also validate scrub data.



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So if you don't want to scrub data, they would usually validate if the data you have is the correct



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one, they would also check for duplicates or they can simply store an item scrap item in the database.



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So let me actually show you how we can write your own pipelines.



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So, guys, if you have a look at the project that we created earlier and if you select here pipelines,



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you can see that the current pipeline is quite simple and it's represented by class.



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So obviously we can change that pipeline to the following.



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So let's try it from scrapie, dot exceptions, import drop item, OK, and then instead of diskless,



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we can create another one.



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So class and I would delete this item adapter from here so you can create a class called Price Pipeline.



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OK.



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And then hero, right object.



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OK, so here I will write about.



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Factor to be equal to one point one five.



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OK, then let's try the due process item.



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So this will be the function and let's right.



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Let's pass the function item and spider, OK, and then if item price.



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OK, so if the item to price and if item price.



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Excludes.



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What?



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OK.



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Item price equals item and then price multiplied by itself and thought, what factor?



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OK, so.



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So this basically means that if the price of the item is excluding the VAT, we'll need to multiply



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it by one point one five.



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Twatt, this tax.



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OK, this is the whole idea that the return item.



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OK, and let's right.



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Else raise and then drop item and here we are.



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Right.



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Missing price in percent as in on the place of the percentage who plays the actual item.



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OK, so obvious to hear.



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If we get different price from what we need, we're going to process it and display the actual price



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we need.



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So imagine if you're shopping and you want to extract information about item prices.



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And if you detect an item that is that is written with price excluding VAT, you always want to multiply



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it by one point one five.



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In order for you to be able to display the actual price of the item.



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So in the end, you have a good sheet with all the prices and you know that all of them are with the



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VAT factor.



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So this was all I want to share with you guys about the pipelines and what is the whole purpose of those



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pipelines.



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So that said, thank you very much for watching.



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I hope you use them very well, although they are not that commonly used when describing objects for



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some projects, you might need them, but is very good to know about their existence.



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So you are able to decide whether you need them or not.



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That's it.



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Thank you very much for watching and I'll see you in the next video.