i am having trouble about json part of venues, in this picture i am trying to take the prefix and suffix, i am putting size between them but my problem is when i try to put them together the link of prefix + size + suffix comes like this -> i am taking prefix and suffix in seperate NSMutableArray's but when i try to join them together it's not working. and here is my way to join them.
where am i doing this wrong?
Are you sure that your objects in the imagePrefix and imageSuffix arrays are actually strings? Because judging from your logs it looks as if you're trying to concatenate two arrays and a string. If you let us know what is actually in those arrays you might get more helpful answers. You must be doing some conversion/manipulation from the original JSON, as in the API they get returned as dictionary items not arrays.
On a unrelated note, consider using fast enumeration (for id item in array) rather than writing out the for statement as you've done. Generally speaking it's also much better to post your code as text using markdown syntax rather than images: makes it much harder to copy/paste your code into an answer.
so thanks to "Matthias Bauch" i figured it out and here is my answer for my own question :)
for (int e = 0; e<=[imagePrefix count]-1; e++) {
NSLog(#"%#b_32%#", [[imagePrefix objectAtIndex:e] objectAtIndex:0], [[imageSuffix objectAtIndex:e] objectAtIndex:0]);
}
Thanks guys!
Related
I am fairly new to Redis and RedisJson and I have been through all the documentation I can get my hands on, but I still can't seem to figure this one out. I am hoping someone could shed some light on this situation to help me understand. My end goal is to be able to remove the JSON object from the responses array using JSON.ARRPOP. I need to get the index of the object first and I can't seem to do that.
Here is my object structure:
JSON.SET test:1 $ '{ "responses":[{"responseId":"29aab59c-10b0-48c0-ab91-8873fb6e2238"},{"responseId":"ab79f09b-8e31-41f4-9191-ef89a34964d3"}]}'
Check the path:
JSON.GET test:1 $.responses[*].responseId
RETURNS:
"["29aab59c-10b0-48c0-ab91-8873fb6e2238","ab79f09b-8e31-41f4-9191-ef89a34964d3"]"
Ok looks good I have an array of two strings lets get that index of 29aab59c-10b0-48c0-ab91-8873fb6e2238.
JSON.ARRINDEX test:1 $.responses[*].responseId '"29aab59c-10b0-48c0-ab91-8873fb6e2238"'
RETURNS:
(nil)
(nil)
It appears to have searched but found nothing?
At first I thought it was an escape character issue but I get the same results with responeIds as integers 1 and 2.
Any help here would be greatly appreciated. Thanks!
JSON.ARRINDEX can only search for scalar values. Objects and arrays are not scalars so you can't search for them.
For your use case you should look at https://redis.io/docs/stack/search/indexing_json/
I am new to python.I am posting here for the first time and I know question might be quite basic but problem is I can't figure out myself.
Lets say I have
List=[("a,"b"),("c","d"),("e","f")]
I want the user to enter one of the elements of one of the tuples as input and the other element is printed.Or more precisely I would say that just one of elements in List[x][0] is input and corresponding List[x][1] element is printed as output.I hope it makes sense.
Thanks!
Please check List in the question.I think you forgot a quote(") in the first tuple.[("a^here,"b"),("c","d"),("e","f")]
I think this might help you.
List=[("a","b"),("c","d"),("e","f")]
c=raw_input('ENTER A CHARACTER-')
for i in xrange(len(List)):
if c in List[i]:
ind=List[i].index(c)
print List[i][abs(ind-1)]
break
How does one use Firebase to do basic auto-completion/text preview?
For example, imagine a blog backed by Firebase where the blogger can tag posts with tags. As the blogger is tagging a new post, it would be helpful if they could see all currently-existing tags that matched the first few keystrokes they've entered. So if "blog," "black," "blazing saddles," and "bulldogs" were tags, if the user types "bl" they get the first three but not "bulldogs."
My initial thought was that we could set the tag with the priority of the tag, and use startAt, such that our query would look something like:
fb.child('tags').startAt('bl').limitToFirst(5).once('value', function(snap) {
console.log(snap.val())
});
But this would also return "bulldog" as one of the results (not the end of the world, but not the best either). Using startAt('bl').endAt('bl') returns no results. Is there another way to accomplish this?
(I know that one option is that this is something we could use a search server, like ElasticSearch, for -- see https://www.firebase.com/blog/2014-01-02-queries-part-two.html -- but I'd love to keep as much in Firebase as possible.)
Edit
As Kato suggested, here's a concrete example. We have 20,000 users, with their names stored as such:
/users/$userId/name
Oftentimes, users will be looking up another user by name. As a user is looking up their buddy, we'd like a drop-down to populate a list of users whose names start with the letters that the searcher has inputted. So if I typed in "Ja" I would expect to see "Jake Heller," "jake gyllenhaal," "Jack Donaghy," etc. in the drop-down.
I know this is an old topic, but it's still relevant. Based on Neil's answer above, you more easily search doing the following:
fb.child('tags').startAt(queryString).endAt(queryString + '\uf8ff').limit(5)
See Firebase Retrieving Data.
The \uf8ff character used in the query above is a very high code point
in the Unicode range. Because it is after most regular characters in
Unicode, the query matches all values that start with queryString.
As inspired by Kato's comments -- one way to approach this problem is to set the priority to the field you want to search on for your autocomplete and use startAt(), limit(), and client-side filtering to return only the results that you want. You'll want to make sure that the priority and the search term is lower-cased, since Firebase is case-sensitive.
This is a crude example to demonstrate this using the Users example I laid out in the question:
For a search for "ja", assuming all users have their priority set to the lowercased version of the user's name:
fb.child('users').
startAt('ja'). // The user-inputted search
limitToFirst(20).
once('value', function(snap) {
for(key in snap.val()){
if(snap.val()[key].indexOf('ja') === 0) {
console.log(snap.val()[key];
}
}
});
This should only return the names that actually begin with "ja" (even if Firebase actually returns names alphabetically after "ja").
I choose to use limitToFirst(20) to keep the response size small and because, realistically, you'll never need more than 20 for the autocomplete drop-down. There are probably better ways to do the filtering, but this should at least demonstrate the concept.
Hope this helps someone! And it's quite possible the Firebase guys have a better answer.
(Note that this is very limited -- if someone searches for the last name, it won't return what they're looking for. Hence the "best" answer is probably to use a search backend with something like Kato's Flashlight.)
It strikes me that there's a much simpler and more elegant way of achieving this than client side filtering or hacking Elastic.
By converting the search key into its' Unicode value and storing that as the priority, you can search by startAt() and endAt() by incrementing the value by one.
var start = "ABA";
var pad = "AAAAAAAAAA";
start += pad.substring(0, pad.length - start.length);
var blob = new Blob([start]);
var reader = new FileReader();
reader.onload = function(e) {
var typedArray = new Uint8Array(e.target.result);
var array = Array.prototype.slice.call(typedArray);
var priority = parseInt(array.join(""));
console.log("Priority of", start, "is:", priority);
}
reader.readAsArrayBuffer(blob);
You can then limit your search priority to the key "ABB" by incrementing the last charCode by one and doing the same conversion:
var limit = String.fromCharCode(start.charCodeAt(start.length -1) +1);
limit = start.substring(0, start.length -1) +limit;
"ABA..." to "ABB..." ends up with priorities of:
Start: 65666565656565650000
End: 65666665656565650000
Simples!
Based on Jake and Matt's answer, updated version for sdk 3.1. '.limit' no longer works:
firebaseDb.ref('users')
.orderByChild('name')
.startAt(query)
.endAt(`${query}\uf8ff`)
.limitToFirst(5)
.on('child_added', (child) => {
console.log(
{
id: child.key,
name: child.val().name
}
)
})
I want Lucene.NET to store a value while indexing a modified, stripped-down version of the stored value. e.g. Consider the value:
this_example-has some/weird (chars) 100%
I want it stored right like that (so that I can retrieve exactly that for showing in the results list), but I want lucene to index it as:
this example has some weird chars 100
(you see, like a "sanitized" version of the original value) for a simplified search.
I figure this would be the job of an analyzer, but I don't want to mess with rolling my own. Ideally, the solution should remove everything that is not a letter, a number or quotes, replacing the removed chars by a white-space before indexing.
Any suggestions on how to implement that?
This is because I am indexing products for an e-commerce search, and some have realy creepy names. I think this would improve search assertiveness.
Thanks in advance.
If you don't want a custom analyzer, try storing the value as a separate non-indexed field, and use a simple regex to generate the sanitized version.
var input = "this_example-has some/weird (chars) 100%";
var output = Regex.Replace(input, #"[\W_]+", " ");
You mention that you need another Analyzer for some searching functionality. Dont forget the PerFieldAnalyzerWrapper which will allow you to use different analyzers within the same document.
public static void Main() {
var wrapper = new PerFieldAnalyzerWrapper(defaultAnalyzer: new StandardAnalyzer(Version.LUCENE_29));
wrapper.AddAnalyzer(fieldName: "id", analyzer: new KeywordAnalyzer());
IndexWriter writer = null; // TODO: Retrieve these.
Document document = null;
writer.AddDocument(document, analyzer: wrapper);
}
You are correct that this is the work of the analyzer. And I'd start by using a tool like luke to see what the standard analyzer does with your term before getting into what to use -- it tends to do a good job stripping noise characters and words.
This question has been asked before, I know. However, nobody has answered it well. I'm wondering how to parse a PDF's "table of contents" on the iPhone. The docs tell me to use CGPDFDocumentGetCatalog but not how to use it. All they say is that it returns a dictionary. Also, I can't find any example code. Any suggestions?
looks like the closest thing seen on SO is Create a table of contents from a pdf file
It's basically just parsing the CGPDFDictionary called "Outline" in the CGPDFPage.
// get outline & loop through dictionary...
CGPDFDictionaryRef outlineRef;
if(CGPDFDictionaryGetDictionary(pdfDocDictionary, "Outlines", &outlineRef)) {
}
then you start with the First element and parse your way through.
CGPDFDictionaryGetDictionary(outlineRef, "First", &firstEntry)
You want to get the Title and the Destination.
NSString *outlineTitle = PSPDFStringFromPDFDict(outlineElementRef, #"Title");
CGPDFDictionaryGetObject(outlineElementRef, "Dest", &destinationRef)
The tricky thing starts with getting the correct destination, because there are (horray, PDF!) several ways to store it, plus several ways that are not defined in the PDF Reference but still out in the wild. Plus several variants that are just broken and you have to deal with it.
For example, you could get the Count of the outline dictionary using
CGPDFInteger elements;
if(CGPDFDictionaryGetInteger(outlineRef, "Count", &elements)) {
PSPDFLog(#"parsing outline: %ld elements. (Count will be ignored anyway)", (long int)elements);
}else {
PSPDFLogError(#"Error while parsing outline. No outlineRef?");
}
But note that Count sometimes is invalid due to broken PDF creation tools. See PDF as HTML. Even if it's broken, parsers will do their best to display as much data as they can. So my advice is to ignore Count and parse the dictionary anyway. (A few weeks ago I encountered a document that had Count = -10. Go figure)
I can't post the full code, as it's from my commercial PDF library PSPDFKit, and I need to make a living out of it ;) But this should get you started.