I have an input where if a user searches for id and if it matches the id, it will display the status. But it gives me an error if a user doesn't give the right ID. What should I do so that even if the user searches for invalid it will just display "Invalid id".
My array
What my code looks like
According to your code, I have seen that
Array Looks like:
let Deliveries=[{DeliveryID:"WHKYYY", OwnerID:2, Staus:"Delivered"},
{DeliveryID:"MHKYYY", OwnerID:3, Staus:"Delivered"},
{DeliveryID:"KKHKYYY", OwnerID:4, Staus:"Warehouse"},
{DeliveryID:"LLHKYYY", OwnerID:2, Staus:"Delivered"},
]
Problem is that when you are searching for something and it is not matching with the DeliveryID that time search result will be undefined. You can use || to avoid the undefined values to set the empty array like [] and before return the staus you can check the rearch result. If the result is empty return "".
Code like :
let track =data.Deliveries.filter(item=> Model.searchQuery===item.DeliveryID)||[];
if(track .length>0){
//mathch the ID and informaiton is avialable
//other code here
}else{
// does not match. return null or ""
}
Related
I’m a beginner in Laravel but have a problem at first. I wrote this query and I’m waiting for Sonya Bins as result but unexpectedly I see ["Sonya Bins"]. what’s the problem?
Route::get('products', function () {
$articles=DB::table('users')->where('id','2')->get()->pluck('name');
return view('products',compact('articles'));
});
pluck will return array if you want to get only single value then use value
// will return array
$articles=DB::table('users')->where('id','2')->get()->pluck('name');
//will return string
$articles=DB::table('users')->where('id','2')->value('name');
// output Sonya Bins
here is an example from the documentation:
if you don't even need an entire row, you may extract a single value from a record using the value method. This method will return the value of the column directly:
$email = DB::table('users')->where('name', 'John')->value('email');
Read more about it here
Hope it helps.
Thanks
pluck() used to return a String before Laravel 5.1, but now it returns an array.
The alternative for that behavior now is value()
Try this:
Route::get('products', function () {
$articles=DB::table('users')->where('id','2')->get()->value('name');
return view('products',compact('articles'));
});
I think it's easier to use the Model + find function + value function.
Route::get('products', function () {
$articles = User::find(2)->value('name');
return view('products',compact('articles'));
});
pluck will return the collection.
I think id is your primary key.
You can just get the first record, and call its attribute's name:
DB::table('users')->where('id','2')->first()->name;
or
DB::table('users')->find(2)->name;
First thing is that you used invalid name for what you pass to view - you don't pass articles but user name.
Second thing is that you use get method to get results instead of first (or find) - you probably expect there is only single user with id = 2.
So to sum up you should use:
$userName = DB::table('users')->find(2)->name;
return view('products',compact('userName'));
Of course above code is for case when you are 100% sure there is user with id = 2 in database. If it might happen there won't be such user, you should use construction like this:
$userName = optional(DB::table('users')->find(2))->name;
($userName will be null if there is no such record)
or
$userName = optional(DB::table('users')->find(2))->name ?? 'No user';
in case you want to use custom string.
I have a array variable viewedprofiles= []; initialized.
I'll be assigning the profiles that have been viewed to this viewedprofiles array. Now if I try to display it (By assigning it to a $scope), I get NULL for other values that have not got assigned or touched.
var viewedprofiles= [];
angular.forEach(profiles, function(value, key){
if(value.viewed== "yes") {
viewedprofiles[value.id] = TRUE;
}
});
The output of viewedprofiles is as follows
[NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,TRUE]
Output explanation :
Since the 9th id's profile viewed value was yes, the output returned TRUE at the 9th element of the viewedprofiles array.
Nothing wrong actually.
But I was wondering as far as the above code, the id was TRUE for 9th element. What if the id was some large number say 15640, Will there be 15639 NULLs before TRUE? Am I doing anything wrong or is there another way to work this out?
I found the answer.
What I was trying to do was basically wrong at the assigning part. I should push the element instead of assigning.
The following worked.
angular.forEach(profiles, function(value, key){
if(value.viewed== "yes") {
viewedprofiles.push(value.id);
}
}, viewedprofiles);
So my question is: how do I scan the JSON in angular to find the first instance of isPrimary:true and then launch a function with the GUID that is in that item.
I have a webservice whos JSON defines available Accounts with a display name and a GUID this generates a dropdown select list that calls a function with the GUID included to return full data from a web service.
In the scenario where theres only 1 OPTION I dont show the SELECT and simply call the function with the single GUID to return the data from the service. If theres no options I dont show anything other than a message.
Code below shows what I currently have.
The Spec has now changed and the data they are sending me in the first service call which defines that select list is now including a property isPrimary:true on one of the JSON object along with its GUID as per the rest
I now need to change my interface to no longer use the SELECT list and instead fire the function call to the service for the item that contains the isPrimary:true property. However there may be multiple instances where isPrimary:true exists in the returning JSON so I just want to fire the function on the first found instance of isPrimary:true
Equally if that property isnt in any of the JSON items then just fire the function on the first item in the JSON.
My current Code is below - you can see the call to retrieve the full details is from function:
vm.retrieveAccount(GUID);
Where the GUID is supplied with each JSON object
Code is:
if (data.Accounts.length > 1) {
vm.hideAcc = false;
setBusyState(false);
//wait for the user to make a selection
} else if (data.Accounts.length == 1){
vm.hideAcc = true;
// Only 1 acc - no need for drop down get first item
vm.accSelected = data.Accounts[0].UniqueIdentifier;
vm.retrieveAccount(vm.accSelected);
} else {
// Theres no accounts
// Hide Drop down and show message
setBusyState(false);
vm.hideAcc = true;
setMessageState(false, true, "There are no Accounts")
}
Sample of new JSON structure
accName: "My Acc",
isPrimary: true,
GUID: "bg111010101"
Still think that's a weird spec, but simple enough to solve. Just step through the array and return the first isPrimary match. If none are found, return the first element of the array.
var findPrimary = function(data) {
if (!(Array.isArray(data)) || data.length == 0) {
return false; // not an array, or empty array
}
for (var i=0; i<data.length; i++) {
if (data[i].isPrimary) {
return data[i]; // first isPrimary match
}
}
// nothing had isPrimary, so return the first one:
return data[0];
}
I have an array of subscription instances #subscription_valids and an array of subscribed player that look like that :
array_subscribed_players = [{"name0" => "link1"}, {"name1"=>"link2"}, {"name2"=>"link3"}....]
What I need to do is : for each subscription in #subscription_valids :
#subscription_valids.each do |subscription|
I need to check if subscription.user.full_name or if subscription.user.full_name_inversed matches a key in one of the hashes of array_subscribed_player (in the exemple "name0", "name1" or "name2").
If it matches then I should store the relevant subscription as key in a hash in a new array and extract the relevant link as value of this hash. My final outpout should be an array that looks like this :
[{subscription1 => "link1"}, {subscription2 => "link2}, ...]
else if the subscription.user.full_name doesnt match i'll just store the subscription in a failure array.
How can I achieve this result ?
See http://ruby-doc.org/core-2.2.3/Hash.html
A user-defined class may be used as a hash key if the hash and eql?
methods are overridden to provide meaningful behavior. By default,
separate instances refer to separate hash keys.
so I think you should override your .eql? method in #subscription_valids to something meaningful (like a unique string)
I can't think for a Array method so you can go like:
demo
results = []
failures = []
#subscription_valids.each do |subscription|
array_subscribed_players.each do |player|
if player.keys.first == subscription.user.full_name || player.keys.first == subscription.user.full_name_inversed
results << { subscription => player[player.keys.first] }
else
failures << subscription
end
end
end
You can try the following:
valid = array_subscribed_players.select{|x| #subscription_valids.map(&:name).include?(x.keys.first)}
Demo
If you need to store both valid and invalid values somewhere:
valid, invalid = array_subscribed_players.partition{|x| #subscription_valids.map(&:name).include?(x.keys.first)}
I have just 2 objects and simple query to retrieve the data.
The result of query which is stored in array ccList according to debug output is:
(
CustomThree__c:
{
Name=cusmei3 2,
customOne__c=a005000000IwnOPAAZ,
Id=a025000000FsFGQAA3
},
CustomThree__c:
{
Name=cusmei3 1,
customOne__c=a005000000IwnOUAAZ,
Id=a025000000FsFGLAA3
}
)
As you can see system.debug(ccList[0]) returns:
CustomThree__c:{
Name=cusmei3 2,
customOne__c=a005000000IwnOPAAZ,
Id=a025000000FsFGQAA3
}
But when I try to get Id (or other field) from the array, the error occurs.
Can anyone point out what am I doing wrong?
code
Object[] ccList;
ccList = [SELECT id, name, CustomOne__r.name FROM CustomThree__c];
system.debug(ccList);
system.debug('******************************************');
system.debug(ccList[0]);
system.debug(ccList[0].Id); //this one cause the error
I think you'll have to change the type of ccList from "Object" to "CustomThree__c". This will also give you compile-time checking when you'll try to write ccList[0].SomeNonExistentFieldName__c.
If you can't do it and really need the object that stores result to be generic - I believe this should be SObject?