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Cosmos db Order by on 'computed field'


Cosmos db Order by on 'computed field'

By : Ali Amaim
Date : October 24 2020, 06:10 AM
this one helps.
ORDER BY item expression could not be mapped to a document path.
code :


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How do you make a computed field both computed and databound to a field?

How do you make a computed field both computed and databound to a field?


By : tony123
Date : March 29 2020, 07:55 AM
Does that help For the computed field's Value, use Advanced data binding and select Expression Language (EL). The expression to use is simply "document1.ReqName" (no quotes).
Knockoutjs + ko.mapping.fromJS + computed field not calculate computed

Knockoutjs + ko.mapping.fromJS + computed field not calculate computed


By : Austin Reilley
Date : March 29 2020, 07:55 AM
To fix this issue I try to do this: , Try ko.mapping.fromJSON() instead of ko.mapping.fromJS()
How to create a computed field using another computed field in a Mongoose projection?

How to create a computed field using another computed field in a Mongoose projection?


By : Naresh
Date : March 29 2020, 07:55 AM
it helps some times I don't think you can access existing computed varible, but you can create the same computed variable using let opertor and use in the another computed varible. Hope this helps.
code :
$project: {
    maxDmg: true,
    attacks: true,
    effDmg: {
        $multiply: ["$maxDmg", 0.70]
    },
    dps: {
        $let: {
            vars: {
                effDmg: {
                    $multiply: ["$maxDmg", 0.70]
                }
            },
            in: {
                $divide: [{
                    $multiply: ["$$effDmg", "$attacks"]
                }, 60]
            }
        }
    }
}
$project: {
    maxDmg: true,
    attacks: true,
    together: {
        $let: {
            vars: {
                effDmg: {
                    $multiply: ["$maxDmg", 0.70]
                }
            },
            in: {
                dps: {
                    $divide: [{
                        $multiply: ["$$effDmg", "$attacks"]
                    }, 60]
                },
                effDmg: "$$effDmg"
            }
        }
    }
}
{
    "maxDmg": 34,
    "attacks": 45,
    "together": {
        "dps": 17.849999999999998,
        "effDmg": 23.799999999999997
    }
}
Product of regular field and computed field in an ORDER BY clause

Product of regular field and computed field in an ORDER BY clause


By : Adam
Date : March 29 2020, 07:55 AM
hope this fix your issue Arbitrary expressions in the order by clause can only be formed from input columns:
code :
select *
from (select 1 as a, 2 as b) s
order by a * b
Order by virtual computed field

Order by virtual computed field


By : ssjohn311
Date : September 28 2020, 03:00 PM
it helps some times Thiago Henrique already answered why virtual doesn't work here, but depending on your underlying database, I would like to present another solution: Generated Columns
Generated Columns are available in PostgreSQL since version 12 and allow to create columns, which are based on other columns values (Which fits your use-case very well!). You get all the advantages of your DB and there is no need to create a virtual field in your application layer.
code :
def up do
  execute """
    ALTER TABLE players ADD percentage_won numeric GENERATED ALWAYS AS (games_won::decimal / NULLIF(games_played,0)) STORED
  """
end
schema "players" do
  field :name, :string
  field :games_played, :integer
  field :games_won, :integer
  field :percentage_won, :float

  timestamps()
end
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