Migration from source YML: implode all values of each array element nested inside an parent array

We are trying to pull in some data from an outside source that serves JSON.

The structure of said json is like this:

[     {         "name":"something",         "desc":"some kind of desc.",         "tags": [             {                 "order":"3",                 "displayName":"Tag1"             },             {                 "order":"13",                 "displayName":"Tags 101"             },             {                 "order":"28",                 "displayName":"Dogs"             }         ]     }, ...  ] 

We want to implode all tags.displayName values into one string. I’ll use the body field as an example. In the UI, if you view the content, “body” would be:

Tag1|Tags 101|Dogs 

In the “fields” section of my migration source yml file:

name: tagsCollection label: "tagsCollection" selector: tags 

Then, in the process section of the YML file I’ve tried this:

body:     plugin: concat     delimiter: "|"     source:      - stepsCollection 

I’ve also looked into the iterator plugin. Nothing seems to click.

If I do this in the process section of the yml file:

body: stepsCollection 

body will be “Array” in the UX. So it is aware that there is an array in that var.

What am I missing?? Many thanks

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Migration from source YML: implode all values of each array element nested inside an parent array

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