I have a question I'm sure it's something easy but I don't find solution.
I'm mapping an array of objects with objects looking like this:
{
categoryFr: "Commande",
categoryEn: "Order"
}
Now I want to to print this data in a div so if I do this, it works I get Commande:
<div>{categoryFr}</div>
But I want to dynamically render accordingly to the language I tried :
<div>`c.name${lang}`</div>
<div>`${c.name}${lang}`</div>
But the string categoryFr is printed instead of the value Commande.
you can access it with something like:
<div>{c[name + lang]}</div>
since obj.property (obj.categoryFr) is the equivalent with obj[property] (obj["category" + "Fr"])
Related
Is there a way to remove a number from an attibute array in an update? For example, if I want to update all of an alchy's booze stashes if he runs out of a particular type of booze:
Alchy has_many :stashes
Stash.available_booze_types = [] (filled with booze.ids)
Booze is also a class
#booze.id = 7
if #booze.is_all_gone
#alchy.stashes.update(available_booze_types: "remove #booze.id")
end
update: #booze.id may or may not be present in the available_booze_types array
... so if #booze.id was in any of the Alchy.stash instances (in the available_booze_types attribute array), it would be removed.
I think you can do what you want in the following way:
if #booze.is_all_gone
#alchy.stashes.each do |stash|
stash.available_booze_types.delete(#booze.id)
end
end
However, it looks to me like there are better ways to do what you are trying to do. Rails gives you something like that array by using relations. Also, the data in the array will be lost if you reset the app (if as I understand available_booze_types is an attribute which is not stored in a database). If your application is correctly set up (an stash has many boozes), an scope like the following in Stash class seems to me like the correct approach:
scope :available_boozes, -> { joins(:boozes).where("number > ?", 0) }
You can use it in the following way:
#alchy.stashes.available_boozes
which would only return the ones that are available.
Scala beginner who is trying to store values obtains in a Scala foreach loop but failing miserably.
The basic foreach loop looks like this currently:
order.orderList.foreach((x: OrderRef) => {
val references = x.ref}))
When run this foreach loop will execute twice and return a reference each time. I'm trying to capture the reference value it returns on each run (so two references in either a list or array form so I can access these values later)
I'm really confused about how to go about doing this...
I attempted to retrieve and store the values as an array but when ran, the array list doesn't seem to hold any values.
This was my attempt:
val newArray = Array(order.orderList.foreach((x: OrderRef) => {
val references = x.ref
}))
println(newArray)
Any advice would be much appreciated. If there is a better way to achieve this, please share. Thanks
Use map instead of foreach
order.orderList.map((x: OrderRef) => {x.ref}))
Also val references = x.ref doesn't return anything. It create new local variable and assign value to it.
Agree with answer 1, and I believe the reason is below:
Return of 'foreach' or 'for' should be 'Unit', and 'map' is an with an changed type result like example below:
def map[B](f: (A) ⇒ B): Array[B]
Compare To for and foreach, the prototype should be like this
def foreach(f: (A) ⇒ Unit): Unit
So If you wanna to get an changed data which is maped from your source data, considering more about functions like map, flatMap, and these functions will traverse all datas like for and foreach(except with yield), but with return values.
I would like to add a conditionally index some data inside the sunspot 'searchable' method in my model. Ideally it would look something like this:
searchable do
string :important_text
if address_visible?
string :address
end
end
In the above example, I would like to index the address field only if the address_visible? method (on the model) returns true. Unfortunately, the address_visible? method throws a 'NoMethodError' because the context is now a Sunspot::DSL::Fields, not the model.
I don't think you can actually do exactly what you want. Nonetheless you could index a different value for address when address is not visible. For example:
searchable do
string :important_text
string :address { |model| model.address_visible? ? model.address : '' }
end
i have an array.
At some stage, i'm adding more data to it.
So we have:
$editable = someArrayGeneratingFunctionHere();
$points = preg_split('/,/',$this->data['Video']['points']);
lovely. Now, the "points" array has a bunch of data that may or may not already be in the editable array.
What i want is to check if the data is in editable, and add if not.
I'd like to do this efficiently too.
So, i have this method:
private function associateWithRelatedBodyParts($editable, $keysAlreadyPresent, ...){
$point = getOtherPointsThatAreRelatedToThisPoint();
if (!isset($keysAlreadyPresent[$point])){
insertDataIntoEditable();
} //else the value is already here. Do not add it again!
return $editable;
}
so the whole thing looks like this:
$editable = someArrayGeneratingFunctionHere();
$points = preg_split('/,/',$this->data['Video']['points']);
$valuesInEditable = ...
foreach ($points as $point){
$editable = $this->associateWithRelatedBodyParts($editable, $valuesInEditable,...);
}
What a lot of setup! The whole point of all this is thus:
i want to flatten the original $editable array, because that way, i can quickly test if a point is in the editable. If it is not, i'll add it.
My current way to retrive the valuesInEditable array is
$valuesInEditable = Set::combine($editable, 'BodyPartsVideo.{n}.body_part_id','BodyPartsVideo.{n}.body_part_id');
This is moronic. I'm sticking the same value twice into the array. What i'd really like is just:
$valuesInEditable = Set::combine($editable, 'BodyPartsVideo.{n}.body_part_id',True);
or something like that. So the whole point of this question is:
how do i set a default value using Set:combine in cakephp. If you have a better suggestion, i'd love to hear it.
Without seeing the structure of your array, it seems like you are going through a lot of work to combine the two arrays. Is there a reason you cannot use
$final_array = array_merge($points, $editable);
before running the set combine?
So, for sending to individual streams we have to reference the connected netStream we want to send to in some way like this:
sendStream.peerStreams[0].send("MyFunction",param1,param2);
and I have to determine which peer I'm sending to by their ID such as "peerID1234"
I know that you can check the peerID of the stream by doing:
sendStream.peerStreams[0]["farID"]
how can I make my send stream function know to use the array index where the peerID is?
so basically it could be like:
sendStream.peerStreams[where peerStreams[]["farID"] == peerID].send("MyFunction",param1,param2);
Sounds like you'll have to loop through the peerStreams array to find the object that has the right farID property value. Basically you are searching through the array for an item with a specific property value. There is no built-in functionality for this. But you can do it with a simple loop. Something like this:
var correctStream:Object = null;
for each (var stream:Object in sendStream.peerStreams) {
if (stream["farId"] == peerId) {
correctStream = stream;
break;
}
}
correctStream.send("MyFunction",param1,param2);
Note that I don't know what the data type is for the peerStreams object so I just typed it as Object in my example.
There's some other approaches mentioned here but they are just different styles of doing the same thing.