Is there a way to actually define the type of a query-parameter? Atm, I can only define the name and if the parameter is required:
f.e. I would like to define arrays or numbers as query-paramters.
You can use multivalued parameter for array
GET resource?id=1&id=2&id=3
If you share your usecase why you need number or bigdecimal or int will help you to find solution.
Related
I was looking inside the create_vlabel function and noted that to get the graph_name and label_name it is used graph_name = PG_GETARG_NAME(0) and label_name = PG_GETARG_NAME(1). Since these two variables are also passed as parameters, I was thinking that, if I wanted to add one more parameter to this function, then I would need to use PG_GETARG_NAME(2) to get this parameter and use it in the function's logic. Is my assumption correct or do I need to do more tweaks to do this?
You are correct, but you also need to change the function signature in the "age--1.2.0.sql" file, updating the arguments:
CREATE FUNCTION ag_catalog.create_vlabel(graph_name name, label_name name, type new_argument)
RETURNS void
LANGUAGE c
AS 'MODULE_PATHNAME';
Note that all arguments come as a "Datum" struct, and PG_GETARG_NAME automatically converts it to a "Name" struct. If you need an argument as int32, for example, you should use PG_GETARG_INT32(index_of_the_argument), for strings, PG_GETARG_CSTRING(n), and so on.
Yes, your assumption is correct. If you want to add an additional parameter to the create_vlabel function in PostgreSQL, you can retrieve the value of the third argument using PG_GETARG_NAME(2). Keep in mind that you may need to make additional modifications to the function's logic to handle the new parameter correctly.
The answers given by Fahad Zaheer and Marco Souza are correct, but you can also create a Variadic function, with which you could have n number of arguments but one drawback is that you would have to check the type yourself. You can find more information here. You can also check many Apache Age functions made this way e.g agtype_to_int2.
I have found that I need to specify predicate types as int in my schema or else numbers get stored as type float:
MyNumericalProperty: int #index(int) .
I have facets that are also numbers, and in the JSON returned from dgraph they appear like so:
"MyProperty|MyPropertyFacet":1.000000
Is there a way to add this to the schema as an int?
Nope, facets are not first-class citizen. So you can't define it. If you have a good use case, maybe opening an issue to request this feature would be interesting.
What is the CQLINQ to get list of all the methods taking a (compatible) type or interface at least as one their parameters?
As explained in Getting list of types that are effected by an extension method in cqlinq
an actual limitation of NDepend is that you cannot access method parameter types.
Hence you can still obtain result by dealing with IMethod.Name string matching (since parameter types are listed in, like "Method(Int32,List<T>)") and get inspiration from CQLINQ for list of methods returning a specific type or interface?
Let's say I get two instances in my code and I don't know their types. How to check it?
If in Java, I can use this code:
a.getClass() == b.getClass()
But in Dart, I can't find similar methods. Although there is the dart:mirrors providing reflect(instance) function, which may let me do it, but I'm not sure if that's a correct solution since it looks complicated.
a.runtimeType == b.runtimeType
I think dart:mirrors (reflection) API helps you. Look at this page :
http://blog.dartwatch.com/2012/06/dartmirrors-reflection-api-is-on-way.html
Also you can look this question(with runtime solution)
How do I get the qualified name from a Type instance, in Dart?
if you want to compare a and b you can use
if(a.runtimeType == b.runtimeType);
but if you want to confirm that a is the type you want you need to do this
if(a.runtimeType.toString()=="DivElement");//a is a div for instance
because runtimeType's value is not a string
For example in the following article
http://www.artima.com/weblogs/viewpost.jsp?thread=179766
Two separate examples are given:
Automatic string conversion
Addition of append method
Suppose I want to have automatic string conversion AND a new append method. Is this possible? I have been trying to do both at the same time but I get compile errors. Does that mean the two implicits are conflicting?
You can have any number of implicit conversions from a class provided that each one can be unambiguously determined depending on usage. So the array to string and array to rich-array-class-containing-append is fine since String doesn't have an append method. But you can't convert to StringBuffer which has append methods which would interfere with your rich array append.