[jboss-jira] [JBoss JIRA] (DROOLS-1547) Add tests to confirm that singleton lists can be treated as the element itself in filter results

[Matteo Mortari (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405147#comment-13405147 ] 

Matteo Mortari commented on DROOLS-1547:
----------------------------------------

In addition to filter result returning, also parameter function call should be considered.

In the attached model decision "Positions of Los Angeles teams" is wrong:

{code:java}
index of(NBA Pacific[city="Los Angeles"])
{code}

As the "index of" function expects 2 parameters.
It could be rewritten as:

{code:java}
index of(NBA Pacific.city, "Los Angeles")
{code}

which would work, but there is an expectations it should also work with:

{code:java}
index of( NBA Pacific, NBA Pacific[city="Los Angeles"])
{code}

under the assumption there is only 1 team located in LA, so NBA Pacific[city="Los Angeles"] is a List of only 1 element, the team located in LA.

> Add tests to confirm that singleton lists can be treated as the element itself in filter results
> ------------------------------------------------------------------------------------------------
>
>                 Key: DROOLS-1547
>                 URL: https://issues.jboss.org/browse/DROOLS-1547
>             Project: Drools
>          Issue Type: Task
>          Components: dmn engine
>    Affects Versions: 7.0.0.CR3
>            Reporter: Edson Tirelli
>            Assignee: Edson Tirelli
>             Fix For: 7.1.0.Final
>
>         Attachments: Ex_6_1.dmn
>
>
> The specification has a provision that singleton lists should be treated as the element itself in some cases, like filter results. I.e., in some cases, {{[a] = a}}.
> This is not completely consistent, but we need to handle it for some cases, like filter results. In other words, the following assignment should work fine, assuming {{a flight}} is a flight variable and {{flight list}} is a list of flights, and the filter returns a single result.
> {code}
> {
>   a flight : flight list[ number = "AC 531" ]
> }
> {code}
> We need to add tests to make sure it is working like that and fix it in case it is not.



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