Getting error: **Enumeration yielded no results** - linq

I'm getting the error Enumeration yielded no results while doing:
IEnumerable<Proxy> pxys = this._ticket.AllProxies.Where(p => p.IfBusy.Equals(false));

The reason you would get that error message is one of 2 reasons, either this._ticket.AllProxies contains no items (e.g. it is an empty collection) or none of the proxies in the collection have a value of false for their IfBusy property.

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Powerautomate Parsing JSON Array

I've seen the JSON array questions here and I'm still a little lost, so could use some extra help.
Here's the setup:
My Flow calls a sproc on my DB and that sproc returns this JSON:
{
"ResultSets": {
"Table1": [
{
"OrderID": 9518338,
"BasketID": 9518338,
"RefID": 65178176,
"SiteConfigID": 237
}
]
},
"OutputParameters": {}
}
Then I use a PARSE JSON action to get what looks like the same result, but now I'm told it's parsed and I can call variables.
Issue is when I try to call just, say, SiteConfigID, I get "The output you selected is inside a collection and needs to be looped over to be accessed. This action cannot be inside a foreach."
After some research, I know what's going on here. Table1 is an Array, and I need to tell PowerAutomate to just grab the first record of that array so it knows it's working with just a record instead of a full array. Fair enough. So I spin up a "Return Values to Virtual Power Agents" action just to see my output. I know I'm supposed to use a 'first' expression or a 'get [0] from array expression here, but I can't seem to make them work. Below are what I've tried and the errors I get:
Tried:
first(body('Parse-Sproc')?['Table1/SiteConfigID'])
Got: InvalidTemplate. Unable to process template language expressions in action 'Return_value(s)_to_Power_Virtual_Agents' inputs at line '0' and column '0': 'The template language function 'first' expects its parameter be an array or a string. The provided value is of type 'Null'. Please see https://aka.ms/logicexpressions#first for usage details.'.
Also Tried:
body('Parse-Sproc')?['Table1/SiteconfigID']
which just returns a null valued variable
Finally I tried
outputs('Parse-Sproc')?['Table1']?['value'][0]?['SiteConfigID']
Which STILL gives me a null-valued variable. It's the worst.
In that last expression, I also switched the variable type in the return to pva action to a string instead of a number, no dice.
Also, changed 'outputs' in that expression for 'body' .. also no dice
Here is a screenie of the setup:
To be clear: the end result i'm looking for is for the system to just return "SiteConfigID" as a string or an int so that I can pipe that into a virtual agent.
I believe this is what you need as an expression ...
body('Parse-Sproc')?['ResultSets']['Table1'][0]?['SiteConfigID']
You can see I'm just traversing down to the object and through the array to get the value.
Naturally, I don't have your exact flow but if I use your JSON and load it up into Parse JSON step to get the schema, I am able to get the result. I do get a different schema to you though so will be interesting to see if it directly translates.

Fix deprecation warning `Dangerous query method` on `.order`

I have a custom gem which creates a AR query with input that comes from an elasticsearch instance.
# record_ids: are the returned ids of the ES results
# order: is the order of the of the ids that ES returns
search_class.where(search_class.primary_key => record_ids).order(order)
Right now the implementation is that I build the order string directly into the order variable so it looks like this: ["\"positions\".\"id\" = 'fcdc924a-21da-440e-8d20-eec9a71321a7' DESC"]
This works fine but throws a deprecation warning which ultimately will not work in rails6.
DEPRECATION WARNING: Dangerous query method (method whose arguments are used as raw SQL) called with non-attribute argument(s): "\"positions\".\"id\" = 'fcdc924a-21da-440e-8d20-eec9a71321a7' DESC". Non-attribute arguments will be disallowed in Rails 6.0. This method should not be called with user-provided values, such as request parameters or model attributes. Known-safe values can be passed by wrapping them in Arel.sql()
So I tried couple of different approaches but all of them with no success.
order = ["\"positions\".\"id\" = 'fcdc924a-21da-440e-8d20-eec9a71321a7' DESC"]
# Does not work since order is an array
.order(Arel.sql(order))
# No errors but only returns an ActiveRecord_Relation
# on .inspect it returns `PG::SyntaxError: ERROR: syntax error at or near "["`
.order(Arel.sql("#{order}"))
# .to_sql: ORDER BY [\"\\\"positions\\\".\\\"id\\\" = 'fcdc924a-21da-440e-8d20-eec9a71321a7' DESC\"]"
order = ['fcdc924a-21da-440e-8d20-eec9a71321a7', ...]
# Won't work since its only for integer values
.order("idx(ARRAY#{order}, #{search_class.primary_key})")
# .to_sql ORDER BY idx(ARRAY[\"fcdc924a-21da-440e-8d20-eec9a71321a7\", ...], id)
# Only returns an ActiveRecord_Relation
# on .inspect it returns `PG::InFailedSqlTransaction: ERROR:`
.order("array_position(ARRAY#{order}, #{search_class.primary_key})")
# .to_sql : ORDER BY array_position(ARRAY[\"fcdc924a-21da-440e-8d20-eec9a71321a7\", ...], id)
I am sort of stuck since rails forces attribute arguments in the future and an has no option to opt out of this. Since the order is a code generated array and I have full control of the values I am curious how I can implement this. Maybe someone had this issue before an give some useful insight or idea?
You could try to apply Arel.sql to the elements of the array, that should work, ie
search_class.where(search_class.primary_key => record_ids)
.order(order.map {|i| i.is_a?(String) ? Arel.sql(i) : i})

Cannot apply indexing with [] to an expression of type 'EnumerableRowCollection<DataRow>

I have this piece of code:
Db.DbDataSet.Tables["costallocations"]
.AsEnumerable()
.Where(Row => Row.Field<long>("callocid") == OldCostAllocationId)[0]["newid"]
And I'm getting the error above. In my opinion, it should work. How can I access the first record of the result set? There will be always only one hit, btw, therefore I use the 0.

How to use Resolve over custom domain

A = {1,2,3,4}
ForAll[x, Element[A,x], x+1>0 ]
Resolve[%]
The above code gives me the following error:
Unable to resolve the domain or region membership condition {1,2,3,4}[Element]x.
I think you have the arguments to Element[A,x] backwards, because A is your domain and x is an element of that domain. Just reversing those is not sufficient to eliminate the error message, but this appears to be enough.
A = {1,2,3,4};
ForAll[x, Element[x,Integers]&&0<x<5, x+1>0 ];
Resolve[%]
which returns True

How to Deserialize in Boo language

Why does the second line give an error?
items = serializer.DeserializeObject(json)
value = items ["key"]
Error: Type 'object' does not support slicing. (BCE0048)
I tried various ways to indicate that "items" is a dictionary, to no avail.
Solution:
items as Dictionary [of string, object] = serializer.DeserializeObject(json)

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