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Return values as array from collection


Return values as array from collection

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Return values as array from collection
Tag : java , By : Ian
Date : January 11 2021, 05:14 PM

I hope this helps you . We have a collection of scrips : , The following query can get us the expected output:
db.scrips.distinct("scrip");
["3647","5647"]
DistinctIterable<String> iterable = scrips.distinct("scrip", String.class);
List<String> scrips = new ArrayList<>();
Block<String> block = scrip -> scrips.add(scrip);
iterable.forEach(block);
db.scrips.aggregate([
    {
        $group:{
            "_id":"$scrip"
        }
    },
    {
        $group:{
            "_id":null,
            "scrips":{
                $push:"$_id"
            }
        }
    },
    {
        $project:{
            "_id":0
        }
    }
])
scrips.aggregate(
                Arrays.asList(Aggregates.group("$scrip"), Aggregates.group(null, Accumulators.push("scrips", "$_id")),
                    Aggregates.project(Projections.exclude("_id"))));
db.scrips.aggregate([
    {
        $group:{
            "_id":null,
            "scrips":{
                $addToSet:"$scrip"
            }
        }
    },
    {
        $project:{
            "_id":0
        }
    }
])
scrips.aggregate(Arrays.asList(Aggregates.group(null, Accumulators.addToSet("scrips", "$_id")),
                Aggregates.project(Projections.exclude("_id"))));

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Why does guava Multimap.values() return a flat collection instead of a collection of collections?


Tag : java , By : ChrisMe
Date : March 29 2020, 07:55 AM
I wish this helpful for you Multimap.asMap().values() isn't a way around the problem -- it was deliberate that Multimap provides both ways of accessing it, getting a Collection> via asMap().values() and getting the flattened Collection with values().
More generally speaking, Multimap tries not to just be "a map to collections," but rather "a general way to associate keys with multiple values." So you get the entries() method in addition to values() and keys(). The asMap() view provides a way to treat it as a "map to collections," but that has very different semantics that aren't always what you're looking for.

How to use web api to return a collection (array) of arrays of unlabeled values


Tag : json , By : Gerhard Miller
Date : March 29 2020, 07:55 AM
With these it helps If you're hard coding the fields you want anyway, then just hard code them into an array right in the lambda expression:
_db.view.select(_ => new string[]{_.Field1, _.Field2, ... , _.FieldN})

Ruby On Rails: how to return a collection (or array) of values from a query


Tag : ruby-on-rails , By : Mariamario
Date : March 29 2020, 07:55 AM
help you fix your problem I have a parent table called FORMS that has many ITEMS in ROR, and ITEMS belongs to FORMS. I need to grab the quantity values from ITEMS that belongs to the last entry in FORMS table. , More memory efficient way:
Form.last.items.pluck(:quantity)

Which collection assertion strategy is used with TestCaseSource collection return values


Tag : chash , By : Nick Pegg
Date : March 29 2020, 07:55 AM
wish helps you The behaviour is not configurable. The fluent Returns method is treated the same as ExpectedResult. NUnit only checks for equality. The NUnit code that handles this is fairly straight forward,
if (testMethod.HasExpectedResult)
    NUnit.Framework.Assert.AreEqual(testMethod.ExpectedResult, result);

Searching for key/value pair in Collection, return all values in that Collection if successfully matched


Tag : java , By : Mark
Date : March 29 2020, 07:55 AM
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