I want to create a graph within gremlin-server from a node.js backend with the javascript driver of gremlin. As I added two properties, one id and one username, the id is working, the username is not stored. Here is the code:
const gremlin = require('gremlin');
const traversal = gremlin.process.AnonymousTraversalSource.traversal;
const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const g = traversal().withRemote(new DriverRemoteConnection('ws://localhost:8182/gremlin'));
const { t: { id } } = gremlin.process;
const { cardinality: { single} } = gremlin.process;
async function createUser(userid,username) {
const vertex = await
g.addV('User')
.property(id,userid)
.property(single,'username',username)
.iterate();
return vertex;
}
await createUser(1001,"testuser")
The output is (when I search the node with g.V(1001).listAll();) The properties are always undefined.
[Vertex { id: 1001, label: 'User', properties: undefined }]
The gremlin server was loaded/run with docker with the following commands:
docker pull tinkerpop/gremlin-server
docker run -d -p 8182:8182 --name gremlin tinkerpop/gremlin-server
The gremlin-driver in node.js has a the version: "gremlin": "^3.4.10",
I've tried with and without the cardinality single above, added more properties, but non is working. The internet searches showed some gremlin-console(groovy) working examples with the .property step, but no hint for the combination node.js-driver of gremlin and the gremlin-server.
I imagine your code is working fine and that the properties are present. The issue is that graph elements returned from queries are "references" only - meaning, they only include id and label and no properties. You should convert your results to use generic containers like Map using a step like elementMap(). You can find more discussion on this in the documentation in various places, but perhaps start with this and if you are interested more in why this is the way it is and what challenges are involved in changing it, please see this.
Related
I'm working on creating a SMART on FHIR application based on the Cerner tutorial at https://engineering.cerner.com/smart-on-fhir-tutorial/.
The following is called in example-smart-app.js
var patient = smart.patient;
var pt = patient.read();
var obv = smart.patient.api.fetchAll({
type: 'Observation',
query: {
code: {
$or: ['http://loinc.org|8302-2', 'http://loinc.org|8462-4',
'http://loinc.org|8480-6', 'http://loinc.org|2085-9',
'http://loinc.org|2089-1', 'http://loinc.org|55284-4']
}
}
});
I've modified slightly to the following:
<script>
fhirOnReady = function(smart) {
patient = smart.patient;
pt = patient.read();
var obv = smart.patient.api.fetchAll({
type: 'Observation',
query: {
code: {
$or: [
'http://loinc.org|8302-2',
'http://loinc.org|8462-4',
'http://loinc.org|8480-6',
'http://loinc.org|2085-9',
'http://loinc.org|2089-1',
'http://loinc.org|55284-4'
]
}
}
});
var populatePatientData = function(patient) {
$("#fname").html(patient.name[0].given);
$("#lname").html(patient.name[0].family);
$("#gender").html(patient.gender);
$("#dob").html(patient.birthDate);
}
$.when(pt, obv).fail(fhirOnError);
$.when(pt, obv).done(
function(patient, obv) {
populatePatientData(patient);
$("#patientJson").html(JSON.stringify(patient,undefined,2));
$("#patientSuccessMsg").html("<h1>Congratulations, you've also successfully loaded a patient using SMART on FHIR</h1>");
}
);
};
fhirOnError = function() {
$("#patientJson").html("An error occurred.\nThis is expected if you are looking at this page from a browser.");
};
FHIR.oauth2.ready(fhirOnReady, fhirOnError);
</script>
If I run the above using the SMART App Launcher at https://launch.smarthealthit.org/ everything seems to work as expected.
However, if I remove the call to smart.patient.api.fetchAll for the observations the patient JSON string is empty.
What is the correct way to get the entire patient resource using the SMART on FHIR JavaScript Library described at http://docs.smarthealthit.org/client-js/?
---EDIT ----------------------------------
If I try to implement using the code in the documentation at http://docs.smarthealthit.org/client-js/#smart-api I get the error shown below.
Code
<!-- index.html -->
<script src="./node_module/fhirclient/build/fhir-client.js"></script>
<script>
FHIR.oauth2.ready()
.then(client => client.request("Patient"))
.then(console.log)
.catch(console.error);
</script>
Error
Libraries are taken directly from the Cerner tutorial.
SMART apps usually have a "patient" in context that is already part of the data passed over to the system from which you are trying to elicit information. In this case you are trying to hit the Cerner FHIR server to get the observations linked to that Patient. Two things are possible at this point:
The Server may not have the Patient resource, which is why it is using the Id of the patient to fetch all observations
Check your smart SCOPEs, you may not be allowed to read Patient records in it's entirety.
Usually the FHIR endpoint can be deciphered using Fiddler following the launch sequence. As per the SMART exchange the CapabilityStatement is queried for the authorization and Token endpoints. If you are able to see the server then you can tack on the /Patient/id to get the resource but this means you have to have a valid token and the appropriate scope statements in place.
I've a content type called continent. Which we the name suggests contains all the information about each continents. Strapi already created API endpoints for me like
continents/:id
But I want to search the continent by it's name since the general user won't be able to search by id
I've created the endpoint
continents/:continent_name
I've also created custom controller following documentation
const { sanitizeEntity } =
requiree('strapi-utils');
module.exports = {
async findOne(ctx) {
const { continent_name } = ctx.params;
const entity = await
strapi.services.continent.findOne({
continent_name
});
return sanitizeEntity(entity, { model:
continents });
And also exposed the API to public
But doesn't seem to anything
Just returns error
How am I supposed to do it
For your use case, you don't need to extend the model controller. You can just pass the continent name as a query param . For example, your url could be something like base_url/continent?continent_name=Asia.
For the code mentioned in the question, there is an issue, the model name should be strapi.models.continent and not continents. Also in the first line requiree('strapi-utils'), you have an extra e in the require. I am assuming that was just a typo.
I have a situation where I'm writing a custom mutation resolver, and currently have to pass the current_user's ID from my frontend to be able to then perform a ::find on the User model. What would be ideal however, is to be able to use an instance of current_user so that I don't have to rely on passing over an ID to my GraphQL server.
I'm still fairly new to the world of Laravel and GraphQL in general, however I've been reading up on the Lighthouse docs that mention the #auth directive, and other StackOverflow answers that mention using auth('api')->user(), however that returns NULL for me. I should also mention that I'm using the lighthouse-graphql-passport-auth library for dealing with user authentication, if that makes any difference. Does anybody know how to access current_user?
public function __invoke($_, array $args)
{
// $user = \App\Models\User::find($args['id']); <--- not ideal
$user = auth('api')->user(); <--- returns NULL
var_dump($user);
foreach ($user->notifications as $notification) {
$notification->viewed = true;
$notification->save();
}
$notifications = $user->notifications->toArray();
return [
'status' => 'Success',
'notifications' => $notifications
];
}
I found an interesting part in the lighthouse-graphql-passport-auth docs that discuss setting a [global middleware][3] to insert the logged in user into the $context. This was exactly like what I needed, and after adding the line into the middleware section of lighthouse.php config as mentioned in the docs, I was able to use $context->user() to return the currently logged in user.
I want to use gremlin-javascript to traverse the remote graph and get a list of vertex, whose id is within a list of predefined ids.
const gremlin = require('gremlin');
const Graph = gremlin.structure.Graph;
const GraphPredicate = gremlin.process.P;
const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const graph = new Graph();
const g = graph.traversal().withRemote(new DriverRemoteConnection('ws://localhost:8182/gremlin'));
g.V()
.has('id', GraphPredicate.within([414, 99999]))
.toList()
.then(function (result) {
console.log(result);
});
Above are the codes I have tried, but it gave me an empty list of vertex, whereas, I expected to have a vertex(414) in the result.
Moreover, when I tested with the gremlin-console by using the statement below, it gave me the vertex(414) in the result.
:> g.V().hasId(within(414,99999))
So I have some questions here:
Do I miss something in the configuration in order to use Predicate?
In the method of javascript GraphPredicate.within([414, 99999])) is the parameter supposed to be only an array of elements or a list of elements separated by a comma as in the case with gremlin-console? By the way, I have tried both ways, but I always got an empty result.
Thank you in advance,
The id is an special property in TinkerPop and can't be retrieved using the name property "id".
The correct way to retrieve by ids in your case should be:
g.V().hasId(P.within(414, 99999)).toList()
.then(result => console.log(result));
Additionally, this can be simplified by removing the within() call:
g.V().hasId(414, 99999).toList()
.then(result => console.log(result));
I can't comment, but in order to use id, you need to use gremlin.process.t.id
Example:
in Gremlin .by(id)
in JS .by(gremlin.process.t.id)
Hope this is helpful
I'm using loopback 3.
I have this lines of codes in my model's js (survey.js):
let enabledRemoteMethods = []
Survey.sharedClass.methods().forEach(function(method) {
console.log(method.name, method.isStatic)
let matchingEnabledRemoteMethod = _.find(enabledRemoteMethods, {name: method.name});
if (!matchingEnabledRemoteMethod) {
Survey.disableRemoteMethodByName(method.name, method.isStatic);
}
});
It works.... almost. I could still see in the explorer the REST endpoint for "PATCH /surveys/{id}". My expectation is: there shouldn't be any REST endpoints listed in the explorer.
Then I examined the URL corresponding to that operation, it is:
http://localhost:3000/explorer/#!/Survey/Survey_prototype_patchAttributes
Which, according to the documentation, means that patchAttributes is a static method.
Then I cross checked with the output in the console... there it says: pathAttributes is not static.
Incosistency!
I even have tried adding this line:
Survey.disableRemoteMethodByName("patchAttributes", true);
Also
Survey.disableRemoteMethodByName("patchAttributes", false);
No luck.
Can someone confirm if it's a bug in loopback 3 (I don't know about loopback 2, haven't checked)? If it's a bug I wouldn't have to spend time on it and just wait until it gets fixed. But if it's not a bug, can someone point out what's missing in my code?
Thanks!
UPDATE: figured out how
With this line I'm able to get rid of it:
Survey.disableRemoteMethodByName("prototype.patchAttributes", true);
The second parameter doesn't seem to matter (you can put false as well). Not sure why though (I suppose it should've accepted true only).
This is my current solution:
let disabledPrototypesRemoteMethods = ['patchAttributes']
let enabledRemoteMethods = [
"create", "findById", "replaceById", "deleteById",
"replaceOrCreateQuestion"
]
Survey.sharedClass.methods().forEach(function(method) {
if (enabledRemoteMethods.indexOf(method.name) == -1) {
Survey.disableRemoteMethodByName(method.name);
}
if (disabledPrototypesRemoteMethods.indexOf(method.name) > -1) {
Survey.disableRemoteMethodByName("prototype." + method.name);
}
});
Still, one small detail: this thing still shows up (I suppose it provides the POST alternative for the normal PUT for the replaceById operation..., but I don't want it; I want to force user of my API to go with the PUT only):
http://localhost:3000/explorer/#!/Survey/Survey_replaceById_post_surveys_id_replace
I tried adding this line:
Survey.disableRemoteMethodByName("replaceById_post_surveys_id_replace");
No luck.
Anyway... hope this useful for others; loopback doc is kind of sketchy.
You can get the prototype methods as well by looking at the stringName property. That way you can include the prototypes in your list.
The stringName includes the sharedClass name in the value, so you will need to parse that out.
module.exports = BusinessProfileContacted => {
const enabledRemoteMethods = ["create", "findById", "replaceById", "deleteById", "replaceOrCreateQuestion", "prototype.replaceAttributes"];
Survey.sharedClass.methods().forEach(method => {
const methodName = method.stringName.replace(/.*?(?=\.)/, '').substr(1);
if (enabledRemoteMethods.indexOf(methodName) === -1) {
Survey.disableRemoteMethodByName(methodName);
}
});
};