Need to access 1st and 2nd element of a list in the template.
My Java code:
myMap.put("key", Arrays.asList("val1", "val2");
My FTL Template:
<#list myMap?keys as key>
${myMap[key][0]}, ${myMap[key][1]}
<-- the line above fails with undefined expression on myMap[key][0]. I checked and myMap[key] is a SimpleSequence. Also, tried ${myMap[key]?first} and that failed with the same error. Any ideas?
[0] and [1] are fine for this, but it looks like that either the sequence has 0 elements, or those elements are null. What does ${myMap[key]?size} print? BTW, you can write ${myMap[key][0]!'some default'} if you want to get a value even if the item is non-existant or null.
Your problem is that you put the List into your 'myMap' object with the key: "key" then try and access it with they key: "keys".
This is why you were getting an undefined expression, to correct it:
<#list myMap?key as k>
${myMap[k][0]}, ${myMap[k][1]}
or of course you could change your java code to
myMap.put("keys", Arrays.asList("val1", "val2");
and use the ftl code as is.
Related
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.
I have an XML document passed as root to a Freemarker template. I want some values from this XML to be assigned to variables as a string and later concatenate/print them out.
<#assign MyVar = root.child1.child2.child3.mynode>
The issue here is that even when a path doesn't exist MyVar gets assigned with a sequence+hash which cannot be printed out or converted to string. This variable although returns false for ?has_content, it needs an extra step for these checks and I have this same issue with many variables and across template files and modules.
The only solution I have been able to find was
<#assign MyVar = root.child1.child2.child3.mynode>
<#assign MyVar = MyVar ?has_content?then(MyVar , "")>
I am looking for something like the Default Value Operator which also checks for nulls like ?has_content.
Does Freemarker provide any simpler one line function to check if a variable has no content and assign it with a default?
In short:
<#assign myVar = root.child1.child2.child3.mynode[0]!''>
Or just <#assign myVar = root.child1.child2.child3.mynode[0]!> if the implicit multi-typed default value doesn't cause problems (like when you just print it with ${}).
Why: XML queries (just like XPath queries) always return a sequence of matching nodes. There are maybe 0 such nodes (or 1, or multiple). An empty sequence is not a "missing value" according the template language. It's an inconvenient mismatch with the XML data-model. But while the sequence always exists, its 1st element ([0]) doesn't, so you can use all the missing value handler operators with it as usual.
I am trying to assign a variable from another variable. My code looks like this
<#macro ctglink c rhs x y z m e b>
<#assign ctg>
<#if ctgroutes["${y}..${x}-${m}"]??>ctgroutes['${y}..${x}-${m}']
<#elseif ctgroutes["${x}..${y}-${m}"]??>ctgroutes['${x}..${y}-${m}']
<#else>{}</#if>
</#assign>
However, this ctg variable is evaluating to just ctgroutes['227..257-TPPMD04X02'] its not actually evaluating the string itself.
I have tried ?eval, and ?interpret and a bunch of other very hacky things to get this to work, no go. Even the {} is a string
Basically, I need the assign function to work like the old PHP eval() function or something. I am trying to access values in a Map whose keys are derived from the state of the data, so I don't see any easy way to query my Map without evaluating keys.
Update:
I forgot to include the elseif in there
Either way, I tried <#assign ctg = ctgroutes["${y}..${x}-${m}"]!ctgroutes["${x}..${y}-${m}"]> but I get the following error:
Caused by: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> ctgroutes["${y}..${x}-${m}"]!ctgroutes["${x}..${y}-${m}"] [in template "RouteCompare-WptTable.ftlh" at line 5, column 24]
I would like a null result to just return an empty map, however that doesn't seem possible:
Caused by: java.lang.RuntimeException: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> ctgroutes["${y}..${x}-${m}"]!ctgroutes["${x}..${y}-${m}"] [in template "RouteCompare-WptTable.ftlh" at line 5, column 24]
So basically, my goal is I need to assign a variable that can take 1 of 3 values:
ctgroutes["${y}..${x}-${m}"] // Assuming it is not null
ctgroutes["${x}..${y}-${m}"] // Assuming it is not null
{} // An empty map
What is the best way to do that?
If I understand well what you want to achieve, you can write it like this:
<#assign ctg = ctgroutes["${y}..${x}-${m}"]!ctgroutes["${x}..${y}-${m}"]!{}>
Also note that <#assign target>...</#assign> is for capturing the output printed between the two tags into the target variable (instead of actually printing it). So target will always store a string or markup value. Also things outside FreeMarker tags and ${} are just static text, and won't be parsed. So, the naive but working approach is just using #if/#elseif/#else and have a separate #assign ctg = ... inside each of them, but you can make this much sorter with the ! operator, as it was shown.
I have an addNewRow() method that returns a object which gets displayed through the Freemarker template. There is a scenario where I need to check if one of the fields of the returning object has the value of -1. I tried the following syntax unsuccessfully.
<#if ${Object.field} ==-1>
<#if Object.field ==-1>
How can I access the object variable in this case?
I'm trying to iterate in a freemarker template over a HashMap<SeapSubscription, List<PiNotice>>.
The map doesn't contain any nulls (in keys or values).
The code in Freemarker is:
<#list subscriptionsWithPiNotices?keys as s>
${s.title}
<#list subscriptionsWithPiNotices[s] as piNotice>
Autoritate contractanta: ${piNotice.contractingAuthorityName}
.
.
</#list>
</#list>
If I remove the iteration from the second list (<#list subscriptionsWithPiNotices[s] as piNotice>) it all works (that is iterating over the map keys, but when I add the second part, trying to iterate over the map-s value, i get a Null / missing exception
FreeMarker template error: The following has evaluated to null or missing:
==> subscriptionsWithPiNotices[s] [in template "seap-subscription-newsletter.ftl" at line 21, column 16]
Tip: If the failing expression is known to be legally null/missing,
either specify a default value with myOptionalVar!myDefault, or use
<#if myOptionalVar??>when-present<#else>when-missing. (These
only cover the last step of the expression; to cover the whole
expression, use parenthessis: (myOptionVar.foo)!myDefault,
(myOptionVar.foo)??
The failing instruction (FTL stack trace):
==> #list subscriptionsWithPiNotices[s] a... [in template "seap-subscription-newsletter.ftl" at line 21, column 9]
#list subscriptionsWithPiNotices?keys... [in template "seap-subscription-newsletter.ftl" at line 18, column 5]
I repeat, I dumped that HashMap, and it only has one key with one ArrayList having one item inside. So there's no reason to report a null, is it ?
Finally i managed to solve the issue, by configuring a
BeansWrapper bw = BeansWrapper.getDefaultInstance();
bw.setSimpleMapWrapper(true);
cfg.setObjectWrapper(bw);
and then using the
map(key) syntax instead of map[key] or map.key. It seems to work with any type of key class.
So this is the old issue that the [] operator only supports string keys. Since 2.3.22 you can use someMap?api.get(someNonStringKey) to work that around. It needs some configuring to enable, but nothing that breaks an existing application. See this answer or this FAQ entry.