I am very new to APIs (a week in) and I’m stuck with a challenge.
I have tables in Postgres and have created models for each. There is a link from one to another (in some circumstances). If the link doesn’t exist then I want to use a default value, held in a different table.
Example:
Table - items
- id (int)
- name (text)
- startDateTime (date)
- endDateTime (date)
Table - itemTypes
- id (int)
- name (text)
- isDefault (boolean)
Table - itemTypesLinkItems
- id (int)
- itemsId (int)
- itemTypesId (int)
- fromDateTime (date)
- toDateTime (date)
At any given date, there will be a list of items that display. Some of those might be linked to itemTypes via the itemTypesLinkItems table, and so I can show the itemTypes.Name. For the remainder, I’d like to show the itemTypes.Name value where the isDefault = true.
I’ve searched all over, tried to do it with SQL views, but no luck. I’m hoping this is something that can be done within the JavaScript of the API.
router.get(‘/:date’, (req, res) =>
db.items.findAll()({
include: [
{
model: db.itemtypelinkitem,
required: false,
include: [
{
model: db.itemtypes
}
]
where: {
startDateTime: {[Op.lte]: req.params.date},
endDateTime: {[Op.gte]: req.params.date}
}
}
]
I just don’t know where to go from here. If I exclude the ‘required’ then only those items with a link are returned. If I include it, then they all show and if there is a link it returns the details, otherwise just returns []. In the event that it returns a [], I’d like to replace that with the values from the default itemTypes.
I hope understood your question well.
You made many to many Relation between (items, itemTypes) and want to get a default
itemType when getting all items.
so I think this problem not related to Sequlize.
You have to insert default 'itemType' while inserting a new record into 'items' table.
Related
I am building an iOS app in SwiftUI for which I have a Core Data model with two entities:
CategoryEntity with attribute: name (String)
ExpenseEntity with attributes: name (String) and amount (Double)
There is a To-many relationship between CategoryEntity and ExpenseEntity (A category can have many expenses).
I’m fetching the categories and showing them in a list together with the sum of the expenses for each category as follows: Link to app screenshot
I would like to add a sort to the fetch request so the categories appear in order depending on the total amount of their expenses. In the example of the previous picture, the order of appearance that I would like to get would be: Tech, Clothes, Food and Transport. I don’t know how to approach this problem. Any suggestions?
In my current implementation of the request, the sorted is done alphabetically:
// My current implementation for fetching the categories
func fetchCategories() {
let request = NSFetchRequest<CategoryEntity>(entityName: "CategoryEntity")
let sort = NSSortDescriptor(keyPath: \CategoryEntity.name, ascending: true)
request.sortDescriptors = [sort]
do {
fetchedCategories = try manager.context.fetch(request)
} catch let error {
print("Error fetching. \(error.localizedDescription)")
}
}
You don't have to make another FetchRequest, you can just sort in a computed property like this:
(I assume your fetched results come into a var called fetchedCategories.)
var sortedCategories: [CategoryEntity] {
return fetchedCategories.sorted(by: { cat1, cat2 in
cat1.expensesArray.reduce(0, { $0 + $1.amount }) >
cat2.expensesArray.reduce(0, { $0 + $1.amount })
})
}
So this sorts the fetchedCategories array by a comparing rule, that looks at the sum of all cat1.expenses and compares it with the sum of cat2.expenses. The >says we want the large sums first.
You put the computed var directly in the View where you use it!
And where you used fetchedCategories before in your view (e.g. a ForEach), you now use sortedCategories.
This will update in the same way as the fetched results do.
One approach would be to include a derived attribute in your CategoryEntity model description which keeps the totals for you. For example, to sum the relevant values from the amount column within an expenses relation:
That attribute should be updated whenever you save your managed object context. You'll then be able to sort it just as you would any other attribute, without the performance cost of calculating the expense sum for each category whenever you sort.
Note that this option only really works if you don't have to do any filtering on expenses; for example, if you're looking at sorting based on expenses just in 2022, but your core data store also has seconds in 2021, the derived attribute might not give you the sort order you want.
I'm trying to get some information about an item, including the item's subsidiary's logo, which naturally requires joining the item to the subsidiary.
The documentation for search.lookupFields says:
You can use joined-field lookups with this method, with the following syntax:
join_id.field_name
So, I duly request the fields I want, including a join on subsidiary:
require(['N/search'], function(search) {
var item = search.lookupFields({
type: search.Type.ITEM,
id: 2086,
columns: ['itemid', 'displayname', 'subsidiary.logo'],
});
log.debug(item);
});
itemid and displayname are fine, but when I try to join another record I get this error:
{
"type":"error.SuiteScriptError",
"name":"SSS_INVALID_SRCH_COLUMN_JOIN",
"message":"An nlobjSearchColumn contains an invalid column join ID, or is not in proper syntax: logo.",
"stack":["doLookupFields(N/search/searchUtil.js)","<anonymous>(adhoc$-1$debugger.user:2)","<anonymous>(adhoc$-1$debugger.user:1)"],
"cause":{
"type":"internal error",
"code":"SSS_INVALID_SRCH_COLUMN_JOIN",
"details":"An nlobjSearchColumn contains an invalid column join ID, or is not in proper syntax: logo.",
"userEvent":null,
"stackTrace":["doLookupFields(N/search/searchUtil.js)","<anonymous>(adhoc$-1$debugger.user:2)","<anonymous>(adhoc$-1$debugger.user:1)"],
"notifyOff":false
},
"id":"",
"notifyOff":false,
"userFacing":false
}
This seems to happen no matter which record and field I try to join. What am I missing?
Although you can return results from multi-select fields, you cannot join to fields on records referenced by multi-select fields (which the subsidiary field on the item record is). Also, you cannot search the logo field on the subsidiary record (not listed in Search Columns under Subsidiary in the NetSuite Records Browser).
This means you have to load the Subsidiary record to get the logo field. In other words:
require(['N/record', 'N/search'], function(record, search) {
var item = search.lookupFields({
type: search.Type.ITEM,
id: 2086,
columns: ['itemid', 'displayname', 'subsidiary'],
});
var subID = item.subsidiary[0].value; //internal id of *first* subsidiary
var subRec = record.load({
type: record.Type.SUBSIDIARY,
id: subID
});
var logo = subRec.getText('logo'); //gets the file name - use getValue to get its ID instead
});
Note that if multiple subsidiaries are set on the item, this only gets the values for the first one. You could iterate through the item.subsidiary result to handle values for multiple subsidiaries if required.
I believe you can't access to the subsidiary record from a lookupfield, you should do a proper search.
https://system.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2018_2/script/record/item.html
You can only join to tables allowed in the Item search object. Try looking for "Subsidiary..." in the Search Results tab within the UI. It's not there. Use the Schema Browser to determine what fields and joins are available.
You cannot think of a NetSuite search as you would any regular SQL search. You have to be cognizant of which fields and which joins can be utilized via the search object.
As people have mentioned, the subsidiary is not a join field available from the item record, one way to achieve what you are trying to do is:
Make a lookup to get the internal id of the subsidiary belonging to the desired item.
Then make a lookup to get the internal id of the logo image (file cabinet image) belonging to the previous subsidiary.
Make another lookup/load the image file to get the URL of the image/logo
You can try to combine the above steps in a single saved search but I think you might need to load the image file to get the URL.
This won't answer your question, but this may help out in the future. The records browser shows everything that you can search and join on, columns and filters, and field IDs. Very useful when building out searches.
NetSuite Records Browser - 2018.2
Is there a way to get the index of the results within an aql query?
Something like
FOR user IN Users sort user.age DESC RETURN {id:user._id, order:{index?}}
If you want to enumerate the result set and store these numbers in an attribute order, then this is possible with the following AQL query:
LET sorted_ids = (
FOR user IN Users
SORT user.age DESC
RETURN user._key
)
FOR i IN 0..LENGTH(sorted_ids)-1
UPDATE sorted_ids[i] WITH { order: i+1 } IN Users
RETURN NEW
A subquery is used to sort users by age and return an array of document keys. Then a loop over a numeric range from the first to the last index of the that array is used to iterate over its elements, which gives you the desired order value (minus 1) as variable i. The current array element is a document key, which is used to update the user document with an order attribute.
Above query can be useful for a one-off computation of an order attribute. If your data changes a lot, then it will quickly become stale however, and you may want to move this to the client-side.
For a related discussion see AQL: Counter / enumerator
If I understand your question correctly - and feel free to correct me, this is what you're looking for:
FOR user IN Users
SORT user.age DESC
RETURN {
id: user._id,
order: user._key
}
The _key is the primary key in ArangoDB.
If however, you're looking for example data entered (in chronological order) then you will have to have to set the key on your inserts and/or create a date / time object and filter using that.
Edit:
Upon doing some research, I believe this link might be of use to you for AI the keys: https://www.arangodb.com/2013/03/auto-increment-values-in-arangodb/
I have been teaching myself web dev (using nodejs, mongodb) for a few days now and have run into a problem.
I have two tables which I need to join, followed by summing certain columns, and finally filtering (using a user specified threshold) based on the value of these sums. I do all this using aggregate pipeline.
The join and creation of columns works fine.
To filter, first I create a new column, isAResult, and use match to retain the records that return true for that column.
This is how I create isAResult.
{ $project: { isAResult: {$cond: { if: {$gte: ["$totalkcal", val_kcals]}, then: true, else: false }}
where val_kcals is initiated earlier as shown below.
var val_kcals = req.body.val_kcals;
Am I missing something?
I seem to be stuck on a classic ORM issue and don't know really how to handle it, so at this point any help is welcome.
Is there a way to get the pivot table on a hasManyThrough query? Better yet, apply some filter or sort to it. A typical example
Table products
id,title
Table categories
id,title
table products_categories
productsId, categoriesId, orderBy, main
So, in the above scenario, say you want to get all categories of product X that are (main = true) or you want to sort the the product categories by orderBy.
What happens now is a first SELECT on products to get the product data, a second SELECT on products_categories to get the categoriesId and a final SELECT on categories to get the actual categories. Ideally, filters and sort should be applied to the 2nd SELECT like
SELECT `id`,`productsId`,`categoriesId`,`orderBy`,`main` FROM `products_categories` WHERE `productsId` IN (180) WHERE main = 1 ORDER BY `orderBy` DESC
Another typical example would be wanting to order the product images based on the order the user wants them to
so you would have a products_images table
id,image,productsID,orderBy
and you would want to
SELECT from products_images WHERE productsId In (180) ORDER BY orderBy ASC
Is that even possible?
EDIT : Here is the relationship needed for an intermediate table to get what I need based on my schema.
Products.hasMany(Images,
{
as: "Images",
"foreignKey": "productsId",
"through": ProductsImagesItems,
scope: function (inst, filter) {
return {active: 1};
}
});
Thing is the scope function is giving me access to the final result and not to the intermediate table.
I am not sure to fully understand your problem(s), but for sure you need to move away from the table concept and express your problem in terms of Models and Relations.
The way I see it, you have two models Product(properties: title) and Category (properties: main).
Then, you can have relations between the two, potentially
Product belongsTo Category
Category hasMany Product
This means a product will belong to a single category, while a category may contain many products. There are other relations available
Then, using the generated REST API, you can filter GET requests to get items in function of their properties (like main in your case), or use custom GET requests (automatically generated when you add relations) to get for instance all products belonging to a specific category.
Does this helps ?
Based on what you have here I'd probably recommend using the scope option when defining the relationship. The LoopBack docs show a very similar example of the "product - category" scenario:
Product.hasMany(Category, {
as: 'categories',
scope: function(instance, filter) {
return { type: instance.type };
}
});
In the example above, instance is a category that is being matched, and each product would have a new categories property that would contain the matching Category entities for that Product. Note that this does not follow your exact data scheme, so you may need to play around with it. Also, I think your API query would have to specify that you want the categories related data loaded (those are not included by default):
/api/Products/13?filter{"include":["categories"]}
I suggest you define a custom / remote method in Product.js that does the work for you.
Product.getCategories(_productId){
// if you are taking product title as param instead of _productId,
// you will first need to find product ID
// then execute a find query on products_categories with
// 1. where filter to get only main categoris and productId = _productId
// 2. include filter to include product and category objects
// 3. orderBy filter to sort items based on orderBy column
// now you will get an array of products_categories.
// Each item / object in the array will have nested objects of Product and Category.
}