I get data from my database (Firebase database). This is a document with several data, including a Array with GeoPoint fields.
var documents = await CrossCloudFirestore.Current .Instance .Collection("Activity") .GetAsync();
My object is defined like this in my Model class: public class Activity { public object elapsedTime { get; set; } public object positions { get; set; } ...... }
It works. I can have the data on my Activity class.
However, I would like to know how I can access this data because foreach loops do not work for object types. Maybe I need to redefine my Activity Class ?
Thx :=)
Edit :
You can see here my firebase :
And then the result of the request :
In your scenario , the property is dynamic for each object , I would suggest you deserialize the root level as a dictionaryand then get the data you want .
Items = JsonConvert.DeserializeObject<Dictionary<string, YourClass>>(content).Values.ToList()
Oh before this, Newtonsoft plugin is required .
Refer to
Deserialize JSON into readable format
It works ! :)
To do it, I defined Array (from firestore) as IEnumerable on my C# class, with the same name from firestore to c#.
And then, here is my query and the line to get my objects converted.
Related
I am using Entity Framework 6.1 with breeze 1.4.11. I am trying to save some data in local storage. My Breeze controller:
[HttpGet]
public object Lookups()
{
return new
{
lookupItems = _contextProvider.Context.LookupItem
};
}
My EF settings:
this.Configuration.ProxyCreationEnabled = false;
this.Configuration.LazyLoadingEnabled = false;
The class I am trying to load:
public class LookupItem : BaseEntityInt
{
public int LookupTypeId { get; set; }
public string Description { get; set; }
public int Ordinal { get; set; }
public virtual ICollection<Party> PartyCountries { get; set; }
}
My breeze client code:
_lookupsQuery = new breeze.EntityQuery.from("Lookups"),
em.executeQuery(_lookupsQuery).then(function (data) {
_lookups = data.results;
// Save data to local storage
store.setItem("Lookups", _lookups); // Fails here
});
The problem is when I save it in local storage, store uses amplifyJs to persist to local storage. AmplifyJs calls JSON.stringify on the persisted object. In the console of the browser I get the following error:
Error: cyclic object value
This is because breeze is automatically loading the navigation property of lookupitem 'partycountries' which itself links back to lookupitem. Anyone any idea why it is doing this? My understanding was you had to explicityly use eager loading or using the expand property (which I am not using) so I can't understand why it is having this behaviour.
The why it is happening can be explained here -
Calling ko.toJS on Breeze entity causes slow long running script
To get around it I believe you can over-ride the toString method on the entities that you are trying to serialize so that it ignores related navigation properties.
The reason I didn't mark this as a duplicate is you are using Amplify.js and some other users in the future might as well.
I can assure you Breeze is not loading the related PartyCountries. Either your server api is including them along with the "Lookups" query payload or you queried them into cache earlier and Breeze wired them up to you "Lookups" as they arrived. Based on the code you're showing us, I'd guess that you loaded PartyCountries earlier in the em (EntityManager) lifetime.
You might let Breeze serialize the entities for you. It takes care of circular references, won't include related entities, and also stores the changed-state with the serialized entities.
For example, with Amplify.store:
var exported = em.exportEntities(data.results, false /* exclude metadata */);
// Save data to local storage
store("Lookups", exported ); // Works!
Later you can retrieve and import them:
var imported = store("Lookups");
var importedEntities = em.importEntities(imported);
You can store an entire graph of entities (e.g., an order and its line items) with the help of the Breeze Labs "getEntityGraph" extension. Here it is applied to your model.
// graph of queried `LookupItems` and their in-cache, related 'PartyCountries'
var graph = em.getEntityGraph(data.results, 'PartyCountries');
var exported = em.exportEntities(graph , false /* exclude metadata */);
store("LookupsAndCountries", exported );
I have a GridView which needs to page and sort data which comes from a collection of Customer objects.
Unfortunately my customer information is stored separately...the customer information is stored as a Customer ID in my database, and the Customer Name in a separate DLL.
I retrieve the ID from the database using Entity Framework, and the name from the external DLL through a partial class.
I am getting the ID from my database as follows:
public class DAL
{
public IEnumberable<Customer> GetCustomers()
{
Entities entities = new Entities();
var customers = (from c in entities.Customers
select c);
//CustomerID is a field in the Customer table
return customers;
}
}
I have then created a partial class, which retrieves the data from the DLL:
public partial class Customer
{
private string name;
public string Name
{
if (name==null)
{
DLLManager manager = new DLLManager();
name= manager.GetName(CustomerID);
}
return name;
}
}
In my business layer I can then call something like:
public class BLL
{
public List<Customer> GetCustomers()
{
DAL customersDAL = new DAL();
var customers = customersDAL.GetCustomers();
return customers.ToList();
}
}
...and this gives me a collection of Customers with ID and Name.
My problem is that I wish to page and sort by Customer Name, which as we have seen, is populated from a DLL. This means I cannot page and sort in the database, which is my preferred solution. I am therefore assuming I am going to have to call of the database records into memory, and perform paging and sorting at this level.
My question is - what is the best way to page and sort an in-memory collection. Can I do this with my List in the BLL above? I assume the List would then need to be stored in Session.
I am interested in people's thoughts on the best way to page and sort a field that does not come from the database in an Entity Framework scenario.
Very grateful for any help!
Mart
p.s. This question is a development of this post here:
GridView sorting and paging Entity Framework with calculated field
The only difference here is that I am now using a partial class, and hopefully this post is a little clearer.
Yes, you can page and sort within you list in the BLL. As long as its fast enough I wouldn't care to much about caching something in the session. An other way would be to extend your database with the data from you DLL.
I posted this question slightly differently on a different forum, and got the following solution.
Basically I return the data as an IQueryable from the DAL which has already been forced to execute using ToList(). This means that I am running my sorting and paging against an object which consists of data from the DB and DLL. This also allows Scott's dynamic sorting to take place.
The BLL then performs OrderBy(), Skip() and Take() on the returned IQueryable and then returns this as a List to my GridView.
It works fine, but I am slightly bemused that we are perfoming IQueryable to List to IQueryable to List again.
1) Get the results from the database as an IQueryable:
public class DAL
{
public IQueryable<Customer> GetCustomers()
{
Entities entities = new Entities();
var customers = (from c in entities.Customers
select c);
//CustomerID is a field in the Customer table
return customers.ToList().AsQueryable();
}
}
2) Pull the results into my business layer:
public class BLL
{
public List<Customer> GetCustomers(intint startRowIndex, int maximumRows, string sortParameter)
{
DAL customersDAL = new DAL();
return customersDAL.GetCustomers().OrderBy(sortParameter).Skip(startRowIndex).Take(maximumRows).ToList();
}
}
Here is the link to the other thread.
http://forums.asp.net/p/1976270/5655727.aspx?Paging+and+sorting+Entity+Framework+on+a+field+from+Partial+Class
Hope this helps others!
I have post request that contains the key "Items[]" with a value like "2,3,12".
I have a controller method that uses the following input model.
public class InputModel
{
public int[] Items { get; set; }
}
Currently "Items" never get set.
Am I doing something wrong (wrong type in my input model, missing an attribute etc) or is there no built-in functionality for this kind of binding?
You really need to post an array of integers? Send up a comma-delimited list like so in the form post:
Items=1,2,3
Spaces between the 1, 2, 3 wouldn't matter.
I've got a model defined like the following...
#MongoEntity
public class Ent extends MongoModel{
public Hashtable<Integer, CustomType> fil;
public int ID;
public Ent(){
fil = new Hashtable<Integer, CustomType>();
}
}
CustomType is a datatype I've created which basically holds a list of items (among other things). At some point in my web application I update the hashtable from a controller and then read back the size of the item I just updated. Like the following...
public static void addToHash(CustomType type, int ID, int key){
//First I add an element to the list I'm storing in custom type.
Ent ent = Ent.find("byID",ID).first();
CustomType element = user.fil.get(key);
if(element == null) element = new CustomType();
element.add(type);
ent.save();
//Next I reset the variables and read back the value I just stored..
ent = null;
ent = User.find("byID",ID).first();
element = ent.fil.get(ID);
System.out.println("SIZE = " + element.size()); //null pointer here
}
As you can see by my above example I add the element, save the model and then attempt to read back what I have just added and it has not been saved. The above model Ent is a minimal version of the entire Model I'm actually using. All other values in the model including List's, String's, Integer's etc. update correctly when they're updated but this Hashtable I'm storing isn't. Why would this be happening and how could I correct it?
You should probably post on the play framework forum for better help..
Alternatives for a mongodb framework are morphia and springdata which have good documentation.
Not sure how Play maps a hash table to a document value, but it seems it cannot update just the hash table using a mongo operator.
You should be able to mark the whole document for update which would work but slower.
Suppose i have the following class.
public class Location
{
public Id { get; set;}
public Name { get; set;}
}
And i have a WebPage called Location that looks like this.
txtId
txtName
txtCountStaffWorkersAtLocation
txtCountVehiclesAtLocation
txtCountNonStaffWorkersAtLocation
txtCountetc
listViewPersonnel
listViewVehicles
Right now i'm calling a repository to display the Location fields on the view, but i'm confused as to what the correct method would be to get and display the data for the other fields. They obviously have very little to do do with the Location Class.
Do i put the Counts in the Location Class and fill them in when i set up the Location class from the database?
Do i have a struct object somewhere that has just has these count fields?
What do you guys normally do with object being displayed on a page that have very little to do with the Domain Object?
Thanks
I'd recommend implementing StaffPersonnel, NonStaffPersonnel, and Vehicles as properties on the Location object, with each of those properties returning a collection of the associated objects. Then for the counts, you could properties from a location object as follows:
loc.Vehicles.Count
loc.StaffPersonnel.Count
loc.NonStaffPersonnel.Count