Dataweave passing varaible to url mulesoft-CodePudding

I'm trying pass the queryParams dynamically to request depending from user what put in postman. Here is the transform message with variable name jql (this variable I would like then pass in url)


<ee:transform doc:name="Transform Message" >
            <ee:message>
            </ee:message>
            <ee:variables>
                <ee:set-variable variableName="queryParams" ><![CDATA[
{
    "demo" : attributes.queryParams['demo'] default "",
        "demo2": attributes.queryParams['demo2'] default "",
         "demo3" :attributes.queryParams['demo3'] default ""
}
                
]]></ee:set-variable>
    <ee:transform doc:name="Transform Message"  >
            <ee:message >
            </ee:message>
            <ee:variables >
                <ee:set-variable variableName="jql" ><![CDATA[
if(vars.queryParams.demo != null and vars.queryParams.demo2 == null and vars.queryParams.demo3 == null)
    "demo= "    vars.queryParams.demo 
else if(vars.queryParams.demo2 != null and vars.queryParams.demo3 == null and vars.queryParams.demo == null)
    "demo2 = "    vars.queryParams.demo2 
else if(vars.queryParams.demo != null and vars.queryParams.demo2 != null and vars.queryParams.demo3 == null )
"demo= "    vars.queryParams.demo    " and demo2 = "    vars.queryParams.demo2 

]]></ee:set-variable>
            </ee:variables>
        </ee:transform>
        <http:request method="GET" doc:name="Request"  config-ref="HTTP_Request_configuration" path="/demo/search">
            <http:query-params><![CDATA[#[output application/java
---
{
    "jql" : vars.jql
}]]]></http:query-params>
        </http:request>

And for example if user put only parameter demo I would like only this "demo = demo" etc.

In this case I got 400 like this:

Message               : HTTP GET on resource 'https://demo/search' failed: bad request (400).
Element               : searchForIssuesUsingJQL/processors/2 @ jira:jira.xml:160 (Request)
Element DSL           : <http:request method="GET"
 doc:name="Request"  config-ref="HTTP_Request_configuration" path="demo/search">
<http:query-params>#[output application/java
---
{
    "jql" : vars.jql
}]</http:query-params>
</http:request>
Error type            : HTTP:BAD_REQUEST

CodePudding user response：

That's not a good way to implement it and it doesn't even cover all possible cases. Better make it dynamic. Let's convert vars.QueryParams into a list for easier manipulation and then reduce it into a single strings, adding " and " to separate elements when the accumulator is not empty:

vars.queryParams
    filterObject (sizeOf($) > 0)
    pluck ((value, key, index) -> {k: key, v:value})
    map ($.k    "="    $.v)
    joinBy  " and "

With this method you don't even need to know if it contains a specific string.