I have an app that uses FlexSearch. In this app, I have an array of items that looks like this:
let results = [
{ id:'a', name:'The title', status:'in-stock' },
{ id:'b', name:'Another title', status:'out-of-stock' },
{ id:'c', name:'Some other', status:'discontinued' },
];
const resultSchema = {
id: 'id',
field: [
'name',
'status'
]
};
const resultIndex = new FlexSearch({
profile:'score',
doc: resultSchema
});
resultIndex.add(results);
My page has checkboxes for the statuses (in-stock, out-of-stock, and discontinued). My question is, how do I find results that are either a) in-stock or b) out-of-stock. I do not see a way to perform logical ORs with the where function. For example, I'd like to be able to say, give me all results that are either in-stock or out-of-stock. From a logical perspective, one could say, give me everything that is NOT discontinued. However, this is not my entire data set. For that reason, I'm trying to figure out how to do ORs within Flexsearch.
Thank you!
See the section Logical Operators in the readme. This seems to work:
const res = resultIndex.search([
{ field: 'status', query: 'in-stock', bool: 'or' },
{ field: 'status', query: 'out-of-stock', bool: 'or' },
]);
Strangely, { field: 'status', query: 'discontinued', bool: 'not' } didn't work when I tried it.
Doesn't using a custom function solve your problem?(found it in the document)
Something like this:
resultIndex.where(function(item){
return item.status === "in-stock" || item.status === "out-of-stock";
});
Related
I'm using project() to get specific fields from my mongodb query (nodeJS mongoDB driver). But in my case I need the projection only in specific cases.
So if useProjection is false, the complete datasets should be returned. I handled it this way:
if (useProjection) {
return Content.find(query)
.project({
title: 1,
type: 1,
category: 1
})
.toArray()
}
return Content.find(query).toArray()
Is it possible to tell project() to return everything as it wouldn't be used, so it would become simpler as:
return Content.find(query)
.project(useProjection && {
title: 1,
type: 1,
category: 1
})
.toArray()
With this, I assume project(undefined) would return the complete dataset. I do not find anythin in the docs, if {} or undefined would be the correct parameter - if it is possible at all.
I don't think there is any option to do in project(), but you can try query builder approach,
let q = Content.find(query);
if (useProjection) q.project({ title: 1, type: 1, category: 1 });
return q.toArray();
I am developing a CLI using Enquirer. I want user of the CLI to write javascript on a json.
So, i want something like this :
Create a Rule on the the data
const model = {
reviews: {
'5': [
{
customerId: 'A2OKPZ5S9F78PD',
rating: '5',
asin: 'asin2',
reviewStatus: 'APPROVED',
reviewId: 'R379DKACZQRXME',
},
],
'4': [
{
customerId: 'A2OKPZ5S9F78PD',
rating: '4',
asin: 'asin2',
reviewStatus: 'APPROVED',
reviewId: 'R379DKACZQRXME',
},
],
},
entityType: 'LIVE_EVENT',
entityId: 'event2',
};
Then user writes the rule.
Object.values(model.reviews).forEach(reviews =>
(reviews as any).forEach(review => {
if (parseInt(review.rating) < 3 && attributes.reviewId.Value.includes(review.reviewId)) {
output.push({
exceptionName: `Customer ${review.customerId} left a review ${review.reviewId} with rating ${review.rating}`,
});
}
})
);
While writing this rule, Since it is on the above json model, I want to provide autocomplete options on javascript and validate if it is correct javascript.
Is there a way to do this ?
If I'm understanding your question correctly, it sounds like you want to take the model object and write it to a JSON file.
If this is your goal, simply do the following:
import { writeFileSync } from "fs";
// Define the model
const model: any = { foo: bar };
// Transform the model object to JSON
const modelJSON: string = JSON.stringify(model, null, 4); // Indents the JSON 4-spaces
// Write the modelJSON to `model.json`
writeFileSync("./model.json", modelJSON);
The above is TypeScript, but the standard JavaScript version is basically the same. Make sure you add #types/node to your package.json file if you're using TypeScript - hope this helps!
I have done some work to do a deep comparison (via Underscore and diff) between two objects (actually a pre-save and post-save version of the same document) in order to isolate the section that is different after a save. Take this document structure as an example:
{
_id: 4d39fe8b23dac43194a7f571,
name: {
first: "Jane",
last: "Smith"
}
services: [
{
service: "typeOne",
history: [
{ _id: 121,
completed: true,
title: "rookie"
},
{ _id: 122,
completed: false,
title: "novice"
}
]
},
{
service: "typeTwo",
history: [
{ _id: 135,
completed: true,
title: "rookie"
},
{ _id: 136,
completed: false,
title: "novice"
}
]
}
]
}
If a new element is added to the history array I'm able to successfully parse out that change.
However, in addition to pulling out this changed section, I also want to be able to effectively walk up from history in order to find the value for service, because I also need to know which of the two services array elements actually changed. Is there a way I can do this with native es6 JavaScript?
If not, is there a library I can use to determine this? Right now I'm able to get the value for "service" via indexing:
if (diff.path[1] === 0) {
targetService = "typeOne";
} else if (diff.path[1] === 1) {
targetService = "typeTwo";
} else if (diff.path[1] === 2) {
targetService = "typeThree";
}
But from my understanding this isn't full proof, because there's no guarantee the order of elements within "services" couldn't change at some point. I suppose this indexing method could work if I could enforce the ordering of the elements within the services array. I'm just not sure if there's a way to do that (open to suggestions if it is possible).
deep-diff gives you the path to this change, something like this:
{
kind: 'N',
path: ['services', 1, 'history'],
// ... other properties
}
You can use this path to track the changed object:
tree.services[changes.path[1]].service // 'typeTwo'
Suppose I have an array feedsArray, the example value may look like this:
this.feedsArray = [
{
id: 1,
type: 'Comment',
value: 'How are you today ?'
},
{
id: 2,
type: 'Meet',
name: 'Daily sync up'
}
]
Suppose I have registered two components: Comment and Meet, Each component has a prop setting as the following:
props: {
feed: Object
}
and the main component has the following definition:
<component v-for="feed in feedsArray" :feed="feed" :key="feed.id" :is="feed.type"></component>
As you can see, it uses is property to select different component. My question is, how to detect feed object change in the child component ? Like when I set
this.feedsArray[0] = {
id: 1,
type: 'Comment',
value: 'I am not ok'
}
How can the Comment component detect the changes ? I tried to add a watcher definition in the child component like the following:
watch: {
feed: {
handler (val) {
console.log('this feed is changed')
},
deep: true
}
},
But it doesn't work here. Anyone know how to solve this ?
Do not assign directly to an array using index - use splice() instead, otherwise JavaScript can not detect that you have changed the array.
If you want to change only the value of an already existing key of an object - then simply update it e.g. this.feeds[0].value = 'I am not okay any more';
This works for existing keys only - otherwise you have to use this.$set(this.feeds[0], 'value', 'I am not okay any more');
I am using a ColumnSet and the helper.insert function for a multi row insert.
I have a table column where I want to use the Postgres Date/Time now() function.
const cs = new helpers.ColumnSet([
'lastname',
{
name: 'rental_date',
def: 'now()'
}
], { table: { table: 'book_rental', schema: 'public' } })
let rentals = [
{
lastname: 'Mueller'
},
{
lastname: 'Johnson'
}
]
let insert = helpers.insert(rentals, cs)
db.result(insert)
.then(data => res.json({ message: 'Ok!' }))
.catch(err => res.json({ message: 'Not ok!' }))
It seems to be working by using def: 'now()', but I want to make sure that I am using it the right way.
Edit:
Regarding the answer in the comment. I tried to do the insert manually and it looks like Postgres is converting the 'now()' string into the now() function.
INSERT INTO book_rental (lastname, rental_date) VALUES ('Mueller', 'now()');
To involve your answer, am I right that this should be the correct code then?
const cs = new helpers.ColumnSet([
'lastname',
{
name: 'rental_date',
mod: ':raw',
def: 'now()'
}
], { table: { table: 'book_rental', schema: 'public' } })
Your code doesn't look right, for the following reasons:
You want to use now() without any condition, but the def value is only used when the property doesn't exist in the source object (see Column). The init callback is what should be used instead to guarantee the right value override.
You return now() as an escaped string, while the query needs it as a raw-text string.
First, let's declare a reusable Raw Text string, as per Custom Type Formatting:
const rawText = text => ({toPostgres: () => text, rawType: true});
Then you can define the column like this:
{
name: 'rental_date',
init: () => rawText('now()')
}
And make sure you are using the latest version of pg-promise (v7.2.1 as of this writing).
Or alternatively, you can declare it like this:
{
name: 'rental_date',
mod: ':raw', // same as mode: '^'
init: () => 'now()'
}
This syntax however will work in all versions of the library, and perhaps is even simpler to use ;)