260. GETting Data

Jul 21, 2026 05:58 · 2:56 · English · Whisper Turbo · 2 स्पीकर
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व्याख्यान निर्देशिका
सिर्फ दिखाएँ
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S… Speaker 1 (260. GETting Data)
So requests are sent with the post method and we do
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S… Speaker 1 (260. GETting Data)
only send them when we subscribe.
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S… Speaker 1 (260. GETting Data)
Let's ignore the data we get back here for now.
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And let's now add another request that actually gets us all
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the posts.
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S… Speaker 2 (260. GETting Data)
And for this,
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I'll add a new private property in here,
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which I'll name fetchPosts.
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S… Speaker 2 (260. GETting Data)
And in here,
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I want to again use the HTTP client and now the get
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method and send a get request.
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to that same URL we used for storing the data,
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because that is the URL from which we'll be able to get that data.
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S… Speaker 1 (260. GETting Data)
Now, before we actually go further,
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let's have a quick look at Firebase,
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and there you should now also see that Posts node here,
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and in there you have that cryptic key again,
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which is an automatically generated ID by Firebase,
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by the way, that's a convenience feature by Firebase.
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It generates such IDs for you,
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S… Speaker 1 (260. GETting Data)
but if you expand this too,
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you see your data.
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S… Speaker 1 (260. GETting Data)
So now the goal is to fetch that data.
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We wanna fetch all the posts that were created.
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S… Speaker 2 (260. GETting Data)
Therefore,
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we're preparing this getRequest.
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S… Speaker 2 (260. GETting Data)
And now,
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S… Speaker 1 (260. GETting Data)
since this is a getRequest,
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S… Speaker 1 (260. GETting Data)
this also needs no second argument because getRequests have no request
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body because,
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S… Speaker 1 (260. GETting Data)
well, you're not sending any data.
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You're instead just requesting data.
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S… Speaker 1 (260. GETting Data)
One thing you need to do here too,
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however, is you need to subscribe.
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No subscription,
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no request.
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So you need to subscribe here and we should
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get back our posts here.
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S… Speaker 1 (260. GETting Data)
That's the hope.
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S… Speaker 1 (260. GETting Data)
So we get back our posts here and we can then console
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.log posts to get an idea of what we're actually getting back.
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S… Speaker 1 (260. GETting Data)
Now I put this into that fetch posts method because
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we can now call this from two different places.
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From in on fetch posts here.
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where I now just call this fetchPosts,
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but I also want to call this from inside ngOnInit.
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So whenever this page loads,
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whenever this app loads,
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I want to fetchPosts.
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S… Speaker 1 (260. GETting Data)
And this should therefore call this method and send this request.
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S… Speaker 1 (260. GETting Data)
Let's save this and this will reload the page and should now already send
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such a request.
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And indeed,
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here is some data we get back.
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And it looks like we're getting back a JavaScript object,
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which has one key value pair in our case,
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where the key is this cryptic key,
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this cryptic string.
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And the value of that is the original object we stored.
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So it's a nested object here.
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S… Speaker 1 (260. GETting Data)
That is the data we originally sent to the back.
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And this is the data we are getting back.
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S… Speaker 1 (260. GETting Data)
Now, that of course means that if I want to store
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all my posts in an array here,
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through which we then can loop to output that,
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we would need to transform this object
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here, because it's a JavaScript object,
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to an array.
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S… Speaker 1 (260. GETting Data)
And we need to transform that data.
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S… Speaker 1 (260. GETting Data)
Well,
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S… Speaker 1 (260. GETting Data)
that screams for observable operators.

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