I've been wondering for some days what kind of scheme would be more appropriate to use a data list in json in a web application.
I'm developing a REST Web Application, and im using Angular for front end, i should order, filter and print these data list also in xml ...
For you what scheme is better and why?
1) {
"datas": [
{ "first":"","second":""},
{ "first":"","second":""},
{ "first":"","second":""}
]
}
2) {
"datas": [{
"data": { "first":"","second":""},
"data": { "first":"","second":""},
"data": { "first":"","second":""}
}]
}
3) [
{ "first":"","second":""},
{ "first":"","second":""},
{ "first":"","second":""}
]
Thanks so much.
The first and third notations are quite similar because the third notation is included in your first.
So the question is "Should I return my datas as an array or should I return an object with a property that contain the array ?
It will depend on either you want to have more information alongside your datas or not.
For exemple, if your API might return an error, you will want to manage it from the front end.
In case of error, the JSON will looks like this :
{
"datas": null,
"error": "An error occured because of some reasons..."
}
At the opposite, if everything goes well and your API actually return the results, it will looks like this :
{
"datas": [
{ "first":"","second":""},
{ "first":"","second":""},
{ "first":"","second":""}
],
"error": null
}
Then your front end can use the error property to manage errors sent from the API.
var result = getDatas(); // Load datas from the API
if(result.error){
// Handle the error, display a message to the user, ...
} else {
doSomething(result.datas); // Use your datas
}
If you don't need to have extra properties like error then you can stick with the third schema.
The second notation is invalid. The datas array will contain only one object which will have one property named data. In this case data is a property that is defined multiple times so the object in the array will contain only the last occurence:
var result = {
"datas": [{
"data": { "first":"a","second":"b"},
"data": { "first":"c","second":"d"},
"data": { "first":"e","second":"f"}
}]
}
console.log("Content of result.datas[0].data : ")
console.log(result.datas[0].data)
Obviously the first option would be easy to use. Once you will access datas it'll give you an array. Any operation (filter, sort, print) on that array will be easy in comparison to anything else. Everywhere you just need to pass datas not datas.data.
Related
My goal is to loop over a JSON response, grab two values, and build out an API call to load information into a POST to create a policy I am building.
To start out on this, I am trying to get two values from a JSON response to assign as variables to build the POST call, which will be the second step to this. As each different "id" and "name" key is assigned, I would like to build out a JSON payload and send the POST calls one at a time. The keys "id" and "name" occurs multiple times in the response payload and I am having issues capturing the two keys.
JSON response
data = {
"data":[
{
"id":"02caf2be-3245-4d3d",
"name":"ORA-FIN-ACTG",
"description":"Oracle",
"links":{
"web":"https://com/",
"api":"https://com/"
}
},
{
"id":"03af2f46-fad6-41a1",
"name":"NBCMAINFRAME",
"description":"Network",
"links":{
"web":"https://com/",
"api":"https://com/"
}
},
{
"id":"0649628b-0e3b-48df",
"name":"CAMS",
"description":"Customer",
"links":{
"web":"https://com/",
"api":"https://com/"
}
},
{
"id":"069d4bcf-3e50-4105",
"name":"SHAREPOINTSITES",
"description":"Sharepoint",
"links":{
"web":"https://com/",
"api":"https://com/"
}
}
],
"took":0.013,
"requestId":"1f364470"
}
I have tried various "for loops" to grab the data. Here is one of the loops below:
data = json.loads(data)
data[0]['data'][0]['name']
for item in range(len(data)):
print(data[item]['data'][0]['name'])
I have also tried reading it as a dictionary:
for data_dict in data:
for key, value in data_dict.items():
team.append(key)
id.append(value)
print('name = ', team)
print('id = ', id)
I am also getting KeyError's and TypeError: the JSON object must be str, bytes or bytearray, not 'dict'.
Any help is appreciated.
FYI, this is the payload I am wanting to populate with the "name" and "id" values:
data= {
"type":"alert",
"description":"policy",
"enabled":"true",
"filter":{
"type":"match-any-condition",
"conditions":[
{
"field":"extra-properties",
"key":"alertOwner",
"operation":"equals",
"expectedValue":name
}
]
},
"ignoreOriginalResponders": "true",
"ignoreOriginalTags": "true",
"continue": "true",
"name": str(name) + " Policy",
"message":"{{message}}",
"responders":[{"type":"team","id":id}],
"alias":"{{alias}}",
"tags":["{{tags}}"],
"alertDescription":"{{description}}"
}
The JSON response which you have given is already a dictionary so no need to use json.loads for that. The multiple item list is actually nested under the data key. So you could just simply iterate through the array of items like this:
for item in data["data"]:
print("{} : {}".format(item["id"],item["name"]))
This is the output:
02caf2be-3245-4d3d : ORA-FIN-ACTG
03af2f46-fad6-41a1 : NBCMAINFRAME
0649628b-0e3b-48df : CAMS
069d4bcf-3e50-4105 : SHAREPOINTSITE
I have a REST call that is working properly. I can pass parameters, it returns data.
The app uses TRESTClient, TRESTResponse, TRESTRequest, TRESTAdapter, feeding into TClientDataSet and TDataSource.
The end result is that when the JSON data comes in, I can iterate through it as if it was a table. With simple JSON, I can get this working.
I am now querying a REST service which is providing data that is one level deeper than normal. See JSON below.
Everything I need to access is UNDER the mycursor element, which is under the items element.
I can't change the REST service, so how can I tell one of these components to ignore the items level and look at the mycursor level?
The data I am looking to parse has a first element of id.
{
"next":
{
"$ref":"https://<internal URL>/?page=1"
},
"items":
[
{
"mycursor":
[
{
"id":13372,
…
},
{
"id":13373,
…
},
{
"id":13374,
…
},
{
"id":13375,
…
},
{
"id":13376,
…
}
]
}
]
}
I am trying to create a view in Cloudant DB which will pick up all the JSON documents based on the value of one field (SAVE_TYPE_SUBMIT). My problem is that, the JSON document contains nested fields. Please take a look at the sample document below.
{
"_id ": "70f79cc9309fd8b2bcca90efd871f993 ",
"_rev": "1-18fe726fc3d99f50a945ab30c9ffeb4b",
"NAME": "qqq",
"EMAIL": "qqq",
"TITLE": "qq",
"DATE_OF_REPORT": "2017/08/17",
"PUBLIC_OFFICIALS_CONTACTED": [{
"NAME_PUBLIC_OFFICIAL": "qq"
},
{
"TITLE_PUBLIC_OFFICIAL": "qq"
}
],
"MANAGER": "qq",
"SAVE_TYPE_SUBMIT": "Submit"
}
The view created is :
function(doc) {
if (("SAVE_TYPE_SUBMIT" in doc) && (doc.SAVE_TYPE_SUBMIT == "Submit")) {
emit (doc.LAST_UPDATE_BY, [doc.NAME, doc.EMAIL, doc.TITLE, doc.DATE_OF_REPORT, doc.PUBLIC_OFFICIALS_CONTACTED, doc.MANAGER]);
}
}
When I try to fetch the data from this view into my application, I do not get the value of the nested fields, i.e. NAME_PUBLIC_OFFICIAL and TITLE_PUBLIC_OFFICIAL. I see those fields as [object,object].
Please note that PUBLIC_OFFICIALS_CONTACTED can contain multiple Name and Title fields.
Please help understand how the view needs to be customized to get the value of the nested fields. I am having a hard time with this and any guidance or material will be highly appreciated!
Create a map function of this form:
function(doc) {
if (("SAVE_TYPE_SUBMIT" in doc) && (doc.SAVE_TYPE_SUBMIT == "Submit")) {
emit(doc.LAST_UPDATE_BY, { name:doc.NAME, email: doc.EMAIL, title: doc.TITLE, date: doc.DATE_OF_REPORT, officials: doc.PUBLIC_OFFICIALS_CONTACTED, manager: doc.MANAGER});
}
}
This is very similar to your map function except that it emits a value which is an Object instead of an array. This object can represent a subset to the original document.
If you need ALL the fields from the original document, then you could modify the function to:
function(doc) {
if (("SAVE_TYPE_SUBMIT" in doc) && (doc.SAVE_TYPE_SUBMIT == "Submit")) {
emit(doc.LAST_UPDATE_BY, null);
}
}
and add ?include_docs=true when querying the view to add the original document bodies to the response.
In my project I got a JSON response via GET request. The subTopics will be selected by the user and stored. Afterwards I send a POST request to the server with the selected ids.
Example JSON1: (from GET request)
{
"TopicList" :
[{
"id": "1234",
"name": "topic1",
"number": "1",
"subTopics": [
{
"id": "4567",
"name": "subTopic1.1",
"number": "1.1"
},
{
"id": "9876",
"name": "subTopic1.2",
"number": :1.2"
}
]
}]
}
In the POST response I get another JSON object from the server, which I have to show in my HTML view as a table. In the response JSON I have the subTopics id (selected by the user) but I do not have the subTopic name associated with the id.
I have to show the subTopic name in my table which is available in a separate object(see above JSON file). I don't know how to access the first JSON object while working with another.
My table view looks like this,
<tr ng-repeat-start="tableRow in searchCtrl.tableViewData" ng-click="tableRow.expanded = !tableRow.expanded">
<td>{{tableRow.project.name}}</td>
<td>{{tableRow.project.number}}</td>
<td>{{tableRow.project.endDate | date}}</td>
<td>{{tableRow.topicIds[0]}}</td>
<td>{{tableRow.matching.score}}</td>
</tr>
As you can see the 4th row: <td>{{tableRow.topicIds[0]}}</td> shows the id. How can I show the topicName?
Any help would be appreciable.
EDIT
In my controller this variable contains the above JSON object.
if (!self.topic) {
searchService.getTopic().then(
function (response) {
self.topic = response.data;
},
function (error) {
alert("Server is not found");
}
);
}
So, the topic variable contains the response JSON object. Maybe it will help.
You can create a function that takes an id and returns the subTopic.
$scope.getSubTopic = function(id) {
var selectedSubTopic = {};
angular.forEach(subTopics, function(subTopic) {
// loop through subTopics until a matching id is found
if (subTopic.id === id) {
selectedSubTopic = subTopic;
return;
}
});
return selectedSubTopic;
};
then you can update your fourth row to:
<td>{{getSubTopic(tableRow.topicIds[0]).name}}</td>
This assumes you have an array named subTopics.
Edit
As mentioned in my comment this will end up performing pretty slow for heavy pages and/or large datasets. You will likely want to generate a map object for the subTopics for quick access. The downside being you have to generate this each time the TopicList is modified.
function generateSubTopicMap(topics) {
var map = {};
angular.forEach(topics, function(topic) {
angular.forEach(topic.subTopics, function(subTopic) {
// use this if you want the map to reference the same data
// (i.e. updating subTopic.name will update the map at the same time)
map[subTopic.id] = subTopic;
// use this if you don't want the map to reference the same data
// map[subTopic.id] = {};
// angular.copy(subTopic, map[subTopic.id]);
// you can also add the parent id here if you need access to it
// this will modify the original object if you use the first method!
// map[subTopic.id].parentId = topic.id
});
});
return map;
}
The output looks like:
{
"4567": {
"id": "4567",
"name": "subTopic1.1",
"number": "1.1"
},
"9876": {
"id": "9876",
"name": "subTopic1.2",
"number": :1.2"
}
}
With this you would call it after every GET request and pass it the array of topics.
// where topics is the response from the GET request
$scope.subTopics = generateSubTopicMap(topics);
And finally to display you just need:
<td>{{subTopics[tableRow.topicIds[0])].name}}</td>
Edit 2
Here is a jsfiddle showing how to use the second method. All you have to do is pass the array containing your TopicList to generateSubTopicMap and it returns an object with the keys as subTopic ids and the value as the subTopic itself.
I wouldn't worry about my first solution. It isn't going to be performant inside an ng-repeat or grabbing 2nd level objects.
I'm new to MongoDB, and I'm trying to get results in a different way.
if I execute the query db.collection.find().toArray() I get something like:
[
{
"_id":"34234...",
"first":"Mark",
"last":"Marker"
},
{
"_id": "34235...",
"first":"Adam",
"last":"Smith"
}
]
is there an api that lets you to receive the results as the following?:
{
"results" : {
"34234..." :{
"_id":"34234...",
"first":"Mark",
"last":"Marker"
},
"4235..." :{
"_id": "34235...",
"first":"Adam",
"last":"Smith"
}
}
Or I need to get the results array and iterate every single object and build my response? (I would like to avoid the single cursor iteration)
I don't believe there's a native API function for that. cursor.toArray() goes through each item in the cursor begin with, so I wouldn't worry too much about that. We can just skip the toArray() and do our own iteration:
var obj = {}
db.collection.find().each(function(item){
obj[item._id] = item;
});
I don't think that would really be any slower.