This is my first post. I don't like ask help in forums, but I have no choice. I spent a lot of days trying resolve this but I haven't found any solution.
All my problem start with an database query that returns this.
{
"prod_format": "400 ml",
"prod_brand": "Marca",
"prod_image": "192.168.1.45/mini/1046332bb531ab3.jpg",
"prod_name": "Gel de baño o ducha",
"prod_pvp": 2.20,
"prod_shops": [
{
"prod_price": 2.29,
"prod_shop": {
"prod_shopID": 2,
"prod_shop_name": "Tienda",
"prod_shop_image": "192.168.1.45/shops/d4d4sw2.jpg"
}
},
{
"prod_price": 2.19,
"prod_shop": {
"prod_shopID": 5,
"prod_shop_name": "Tienda",
"prod_shop_image": "192.168.1.45/shops/g4hbe72.jpg"
}
}
]
}
I want remove prefixes of keys, prod_ and shop_ in this case.
I can't do this by hand because this is only one of multiple queries that i use, and this data can change, i need an dynamic function that remove these prefixes, to use with more prefixes and more queries.
So far I have been trying:
Recursive function that calls itself to remap inside objects and
arrays, but it doesn't work because NodeJS is asynchronous and make an
loop that never ends.
Use an list function that gets all keys/values to make a new object
with renamed keys, but i cant found anything that works with complex
objects.
Use chained promises, i can't get that it works, but i think that
it is the best way to do this.
In conclusion I want an function that if I put the upper object, I get this code.
{
"format": "400 ml",
"brand": "Marca",
"image": "http://192.168.1.45/mini/1046332bb531ab3.jpg",
"name": "Gel de baño o ducha",
"pvp": 2.20,
"shops": [
{
"price": 2.29,
"shop": {
"shopID": 2,
"name": "Tienda",
"image": "http://192.168.1.45/shops/d4d4sw2.jpg"
}
},
{
"price": 2.19,
"shop": {
"shopID": 5,
"name": "Tienda",
"image": "http://192.168.1.45/shops/g4hbe72.jpg"
}
}
]
}
PS:
I can't edit the original object, because it comes of elasticsearch and i can't edit object keys.
Thanks in advance, I hope that anyone can help me.
Why don't you simply treat your Json data as a string and then replace '"_prod' with '"'? That would remove all occurances of this prefix.
myJsonString.replace('"_prod', '"');
Update: If your values may contain your prefixes, you better use regular expressions instead, just to make sure you only change the keys.
Related
I'm struggling to figure out if my method of listing objects in JSON is correct/efficient. I'm creating an API that will let the user search for engines in various ways and get info on them. So each "engine" object has several key/value pairs with it, and each "engine" is different. My current format is this:
{
"engines": [
{
"name": "Ford Modular Engine 3-valve",
"maker": "Ford",
"cam": "SOHC"
},
{
"name": "LS6",
"maker": "Chevy",
"cam": "OHV"
}
]
}
My concern with this format is accessing a specific engine as it is hidden under an array.
The other format idea I had was this (but I'm not sure if this is "proper" syntax for a JSON object)
{
"engines": {
"ford3v": {
"name": "Ford Modular Engine 3-valve",
"maker": "Ford",
"cam": "SOHC"
},
"ls6": {
"name": "LS6",
"maker": "Chevy",
"cam": "OHV"
}
}
}
Do the differences come down to personal preference? What is the industry standard?
In maximum cases option will be upto your requirement. It is better to have the following format because, it will be easy for you if you want to repeat the list in your html.
{
"engines": [
{
"name": "Ford Modular Engine 3-valve",
"maker": "Ford",
"cam": "SOHC"
},
{
"name": "LS6",
"maker": "Chevy",
"cam": "OHV"
}
]
}
I'd go with the first option, because your search API implies it'll be a list of engine objects coming back. With JSON, I tend to think of objects as key-value pairs for known properties, so it's more straightforward to iterate over a list and know to look for properties on those objects to do any filtering.
Not knowing the specific case you're writing this API for, I don't believe that consumers know to look for specific engines by the key/property you provide in the second example, especially if it's merely duplicating a field (name) already present in the object.
I'm calling an api for the history of an ID which returns a string object that looks like this:
09304790130000--09304790090000
09304790130000--09304790120000
09304790090000--09304790010000
09304790120000--09304790020000
09304790120000--09304790030000
09304790120000--09304790110000
09304790110000--09304790050000
09304790010000--042322003
09304790020000--042322002
09304790030000--042322001
09304790050000--042322004
I could do so much more with it if I could figure out how to use JavaScript to convert it to JSON so it would look like this:
{
"name": "09304790130000",
"children": [{
"name": "09304790090000",
"children": [{
"name": "09304790010000",
"children": [{
"name": "04 2322-003"
}]
}]
}, {
"name": "09304790120000",
"children": [{
"name": "09304790020000",
"children": [{
"name": "04 2322-002"
}]
}, {
"name": "09304790030000",
"children": [{
"name": "04 2322-001"
}]
}, {
"name": "09304790110000",
"children": [{
"name": "09304790050000",
"children": [{
"name": "04 2322-004"
}]
}]
}]
}]
}
Is there an algorithm I can use that can construct the object I need regardless of how complicated the "tree" becomes?
EDIT for clarity:
The "--" in the string represents the relationship of the ID's. The left ID is the parent of the ID right of the dashes. So the ID that I feed the api, "09304790130000" has two children, each could have more children until they reach the current 9-digit ID.
What you have here is an input that is in a custom format. What you need to handle it is a regular expression. (Although your format might be simple enough that a full on regex function is not required so much as splitting on separators?) You need to do is break the input string up and loop over the components and put those into your desired data structure (which sounds like it would be some kind of tree). The high level pseudo-code would be something like:
Take line of input.
Break on "--".
Create root node from the left side if the tree is empty, otherwise just find the existing node.
Add child from right side to the parent.
Getting it into the JSON format you want may require also writing a function that iterates over the tree and writes a string in that format... although if you are using existing libraries and data types this probably already exists.
EDIT: To expand on the last bit, to get the format you want would mean a Pre-order traversal of the tree. At each step you just add the formatting and name to the JSON String. One of these libraries should have the capabilities you need, although obviously you can write a tree data structure and traversal function yourself if you need to.
I'm quite new to programming and I been googling but couldn't find exactly what I'm looking for.
ok I send a request by ajax and I get response similar to this (the original json is much more complicated)
{
"shelf": {
"genre": {
"title1": {
"date": "date",
"author": "name",
"featured": "N"
}
"title2": {
"date": "date",
"author": "name",
"featured": "Y"
}}}
now I need to do find a "book" which is featured. So I have been looking for a way to look for featured = Y and get it's title in this case "title2".
The best way I could figure out is that when I create the json (in php) when something is featured I can create a new key => value at the same level as "shelf"
"shelf": {
"genre": {
"title1": {
/.../
}
"title2": {
/.../
}}}
"featured": {
"genre": "featuredTitle"
"genre2":"featuredTitle2"
}}}
and then access it in javascript like this:
response.featured['genre'];
and then get all the data by going to
response.shelf.genre.title
but there must be a better way to do it... this gets very messy when the json is very complicated.
Thanks,
Tom
Almost there. You can loop through a JSON object quite easily, JSON is a very friendly format.
var genres = response.shelf.genre;
for (title in genres) {
if (genres.hasOwnProperty(item)) {
var bookTitle = title;
var featured = genres[title].featured;
}
}
The hasOwnProperty is a safety feature you should always use when looping through a JSON object. You can find out more about it here.
More on JSON
JSON solely consists of Javascript Objects and Arrays, one or the other. So even if the stack is complicated, you can always parse it by traversing either an object or an array, and so long as you know the structure of the JSON, it is easy to parse.
// Objects:
myJSON.subObject.anotherSubobject.andAnotherOne;
// Arrays:
myJSON[0]; // accesses first item in array...
myJSON.subObject[2]; // accesses third item in the subObject array.
Hi I am trying to parse the following bit of json with Jquery so far I can get everything out of the results that I want apart from one crucial piece of information the performance tags.
Each json result is wrapped in an event tag and then within this there is info like time and date etc formatted in the following way
"location": {
"lng": -0.1187418,
"city": "London, UK",
"lat": 51.4681089
},
"start": {
"time": "19:30:00",
"datetime":"2010-02-16T19:30:00+0000",
"date": "2010-02-16"
},
I have managed to loop through this and parse it to html. However there is one set of tags for 'performance' that are formatted differently.
"performance": [{
{
"artist": {
"uri": "http://www.songkick.com/artists/288696-vampire-weekend",
"displayName": "Vampire Weekend",
"id": 288696,
"identifier": [{"mbid": "af37c51c-0790-4a29-b995-456f98a6b8c9"}]
}
"displayName": "Vampire Weekend",
"billingIndex": 1,
"id": 5380281,
"billing": "headline"
}
}],
now in my for loop i am running the following code which displays the performance information in the console.
var events = data.resultsPage.results.event;
for (var i = 0, l = events.length; i < l; i++) {
console.log(events[i].performance); }
However when i try to go into the structure like i have been with the other elements I get returned undefined i.e
console.log(events[i].performance.displayName);
Do I have to do this in a different way because of the use of the [ ] brackets in the performance tag in the Json?
Thanks in advance
Assuming that what you posted is not exactly what your JSON looks like (because what's posted has a syntax error), the "performance" attribute is an array of objects. To get at the "displayName", therefore, you'd need to know which element of the "performance" array you wanted. You'd then access it by index.
console.log(events[i].performance[j].displayName);
(assuming you looped through the "performance" array with the variable "j".)
Try to validate your returned JSON object here, I guess there is some issue with the JSON output..
Given the following object graph:
{
"children": [{
"child": {
"pets": [{
"pet": {
"name": "fido"
}
},
{
"pet": {
"name": "fluffy"
}
}
]
}
},
{
"child": {
"pets": [{
"pet": {
"name": "spike"
}
}]
}
}
]
}
What would be a nice one-liner (or two) to collect the names of my grandchildren's pets? The result should be ["fido", "fluffy", "spike"]
I don't want to write custom methods for this... I'm looking for something like the way jQuery works in selecting dom nodes, where you can just give it a CSS-like path and it collects them up for you.
I would expect the expression path to look something like "children child pets pet name"
LINQ to JavaScript (JSLINQ) is an implementation of LINQ to Objects implemented in JavaScript. It is built using a set of extension methods built on top of the JavaScript Array object. If you are using an Array, you can use LINQ to JavaScript.
LINQ to JavaScript is an open source project and you can download it from here: http://jslinq.codeplex.com/
Hope this helps...
s
If you don't want to use a library, this is the most concise way I could think of writing it.
var Ar=[];
p.children.map(function(a){a.child.pets.map(function(a){Ar.push(a.pet.name)})});
I settled on the JSONPath library, which is like XPath for JSON. LINQ seemed a little heavyweight for my needs, resulting in a more verbose syntax, though it does look more powerful. Perhaps if my needs change I'll upgrade.