I am learning about Parse database when I came across this, please explain it with example
I referred this answer but I couldn't understand the green ticked answer
It would be good if you could specify which Parse SDK you are talking about, but I will consider we are talking about the Android SDK.
ParseObject.put() can be used to set a value to an object's field:
ParseObject gameScore = new ParseObject("GameScore");
gameScore.put("score", 1337);
gameScore.put("playerName", "Sean Plott");
gameScore.put("cheatMode", false);
gameScore.saveInBackground();
ParseObject.add() can be used to add a value to an object's field of type ARRAY:
gameScore.add("skills", "flying");
gameScore.add("skills", "kungfu");
gameScore.saveInBackground();
Related
I’m trying to create a new dataset type Powerapps Component (PCF). For the moment I am using it to display a view of the records that are available in an entity in Microsoft Dynamics CRM.
I wish to make the view sort itself when I click on the grid column headers (in a similar way that the default CRM grid view does). I'm trying to figure out how to apply a sort to the dataset so that I can refresh it as indicated by the documentation for the dataset.refresh() function:
Refreshes the dataset based on filters, sorting, linking, new column.
New data will be pushed to control in another 'updateView' cycle.
The dataset object does have a “sorting” property, but changing its value and then refreshing the dataset doesn’t seem to have any effect. After the refresh, the sorting property reverts to the value it had before I changed it.
In short, the click handler for the grid header does something like the following bit of code. The refresh gets done and my updateView() function gets called as expected but the sorting was not applied.
dataset.sorting = [{name: 'createdon', sortDirection: 1}];
dataset.refresh();
Any help on getting the dataset sorting to work would be appreciated.
I've been experimenting with PowerApps Component Framework a little bit recently and I can confirm that the following code won't be working:
dataSet.sorting = [ { name: "columnName", sortDirection: 0 } ];
However, I managed to get this one working for me:
dataSet.sorting.pop(); // you may want to clean up the whole collection
dataSet.sorting.push({ name: "columnName", sortDirection: 0 });
I haven't really figured out the reason of this behavior. The sorting array may be implemented as some form of observable collection in the background.
I hope this will guide you to a functioning solution.
The documentation is pretty abysmal here, but here is my best guess from putting a few different pieces of information together.
TLDR: I think there is some kind of extra method that needs to be called on the .sorting property, but I can't find out what it is called. Maybe something like:
dataset.sorting.setSorting({name: 'createdon', sortDirection: 1});
I think you're going to have to try a bunch of likely method names and see what works.
Background and links:
The only reference I could find to dataset.sorting was from here:
In this preview for canvas apps, only a limited set of filtering and sortStatus methods are supported. Filter and sort can be applied to dataset on primary type columns except for the GUID. Filter and sorting can be applied in the same way as in model-driven apps.To retrieve the dataset with filtering and sorting information, call
the methods in context.parameters.[dataset_property_name].filtering
and context.parameters.[dataset_property_name].sorting, then invoke
the context.parameters.[dataset_property_name].refresh().
So it seems that the .filtering and .sorting properties are handled similarly, and that there are some methods attached to them, and only some are supported. That is about as vague as they could make it...
I did find an example of how .filtering is used:
_context.parameters.sampleDataset.filtering.setFilter({
conditions: conditionArray,
filterOperator: 1, // Or
});
There is a brief reference to .setFilter() in the docs, as well as FilterExpression
There is a SortStatus reference, but it doesn't have any corresponding methods explicitly called out. It is possible that this is not yet a supported feature in the public preview, or the documentation is lacking and the name and syntax of the method you need to call on .sorting is not yet documented.
GraphQL Nexus is fairly new and the documentation appears to be lacking. In addition the examples are lacking as well. From the example and from the doc I am trying to add my own NON-GraphQL scalar type. I created my own scalar following the example in the documentation however when I try to call it in an objecttype I get the read underline. What am I doing wrong?
To resolve this issue what I did was:
1. once you create your own scalar type such as:
#json.ts **FILE NAME MATTERS**
export const JSONScalar = scalarType({
name: "JSON",
asNexusMethod: "json",
description: "JSON scalar type",
...})
2. Once I called the new type in a separate object I had to add this above my field for it to compile, you may not have too:
//#ts-ignore
t.topjson("data");
3. In my make schema I added the scalar code first:
const schema = makeSchema({
types: [JSONScalar, MyObject, BlahObject],
The name of the file is very important I think that is how the schema is generated and looks for the new type. I also think you have to be sure to compile that code first in the makeSchema however I did not try to switch around the order as I spent a lot of time trying to figure out how to make my own scalar type work.
This may have been self explanatory for more seasoned Nexus developers however I am a novice so these steps escaped me.
Happy coding!
You can also do this:
t.field("data", {type: "JSON"});
That works perfectly fine with TypeScript.
And I wish they had better examples and documentation. Their examples only cover the most trivial use cases. I'm getting very heavily into GraphQL, Prisma, Nexus and related tool for a huge data set. So I'm literally hitting every limitation and lack of documentation that exists.
But alas we can pool our knowledge here.
I'm searching for guidance about how to implement a session-level variable on bot framework.
I've created a class to store global vars that is working fine.
However, these variables are persisted across all bot sessions which is not what I need now.
Thanks in advance,
I'm not sure of you are using the Node or the C# SDK. You can easily store data like this in the Databags provided by the SDK. UserData, ConversationData, and PrivateConversationData
For the purposes of just demonstrating how to use this i'm only going to use UserData but any databag could be used the same way
Node
For node, you would set values as if you were using a dictionary or hashmap in other languages:
You can use either dot notation or bracket notation:
session.userData.SomeProperty = "someValue";
session.userData["SomeProperty"] = "someValue"
And then to use the data later, again you can use either dot notation or bracket notation:
var foo = session.userData.SomeProperty;
var foo = session.userData["SomeProperty"]
C#
To set Data:
context.UserData.SetValue("SomeProperty", "SomeValue");
To get data:
context.UserData.GetValue<string>("SomeProperty");
In C# if you need to do this in a place you do not have access to the context object refer to this SO answer
I am confused about wiring up my own datasource to the Kendo Scheduler. I looked at their API and I'm still confused. For instance, I see it says the start and the end are required, but are they the names of the fields in my dataset? They can't be mapped to another name?
My dataset has some other details as well as a date in the format, "2016-10-20T00:00:00." Is this going to work?
Can someone tell me if the actual field names from the DB/JSON are literally the same as in Telerik's docs? For instance, my date field isn't called "Start" and End. It's something else, and I don't even have an end, and I don't have starttimezone and endtimezone, are these all needed?
Another question I have is: I'm not limited to just the fields from their documentation am I? I have a datasource that has other things, for instance, we don't have "title," we have something else. And riding off that question, I'm hoping that when I call the pop up when the user double clicks on a time/day or event, that I can customize what fields I want to appear.
The other question is: What is the "from" attribute/property for? For instance
end: { type: "date", from: "End" },
Thanks
My two cents on this:
I think the options "Title", "Start" and "End" are the ones that are always needed on the dataSource. "startTimezone" and "endTimezone" are not always needed.
I also think that the "from" attribute/property is a reference to from where you are getting that data. I mean, which field from the database guards a specific information.
You can also have your own custom fields to the model, as long as they came from a valid field from the database and as long as they have an correspondent and valid datatype value.
At last but not the least, you can also customize what fields you can make appear once you do double-click and the pop-up window shows up. For that, you must use your own template for a custom pop-up editor.
Hope this gives you some insight.
Thanks for the help. I figured out the core issue with the error. It was a matter of me tweaking my schema model.
I am quite new to Qt and am in a situation where I want to use a model for my needs:
I have a dynamic number of instances of a subclass that need to be handled differently (different UI controls for each if it is selected). I want to get a list view where I can add new elements or delete old ones, as well as disabling/enabling existing ones.
Of course I want to rewrite as least of the code as possible, so I thought of utilizing the Listwidget and a ListModel to give some controls to the user. But how to link these (or better the items) to instances of the classes?
Do you know any tutorials on this?
I already looked in QtDemo and Google but I do not know the right words to search for
so I had no good results.
Basically what I think I need is a model item that accepts Collider* for its data.
But when I plug this into QStandardItem.setData() it says error: ‘QVariant::QVariant(void*)’ is private
So I found the solution to this problem.
As QStandardItems are capable of storing QVariants as data I wanted to store a pointer to my data in a QVariant. To achieve this I had to use Q_DECLARE_METATYPE(MyType*).
With this I was able to
MyType *MyInstance = new MyType;
QVariant data;
data.setValue(MyInstance);
QStandardItem *item = new QStandardItem("My Item");
item->setData(data);
standardModel->appendRow(item);
And the best is you can add as many types you want and let QVariant do the work to decide if it contains the type you wanted:
if(v.canConvert<MyType*>())
//Yes it is MyType
else if( v.canConvert<MyOtherType*>())
//Oh it is the other one
So finally this only requires to declare the meta type so you do not have to subclass any items.
Also you should read on the limitations of this here:
Q_DECLARE_METATYPE
qRegisterMetaType
Does this page answer your questions? There's an example of deriving a StringListModel item that you might be able to use as a template