CODEWITHSUNDEEP
javaarraysloopsmustacheanonymous-arrays
J. Doe
J. Doe

Reputation: 151

Mustache Java: Iterating over an anonymous/keyless/top-level array

Question: How to iterate over an array read from json input, that does not have a variable name/key. I did not want to restructure the json file as I'd have to edit the service which generates this json and also other services rely on this file and would have also been affected.

A solution for javascript has already been posted using "." as array name in the Mustache template: Can mustache iterate a top-level array? and here Iterate over keyless array with mustache?

I had the same question for the java implementation of Mustache.

Again, an example of input data (json):

[ 
{
  "name" : "test",
  "week" : "first",
  "date" : "Wed Oct 02 14:06:35 GMT 2019",
  "status" : "success"
}
]

Upvotes: 0

Views: 387

Answers (1)

J. Doe
J. Doe

Reputation: 151

Reading this with Jackson into a map and then converting it back to a json string showed me that Jackson will name this array "object". Here's an output of that conversion and reconversion:

{
  "object" : [ {
    "name" : "test",
    "week" : "first",
    "date" : "Wed Oct 02 14:06:35 GMT 2019",
    "status" : "success"
  } ]
}

So if you use Jackson, we can simply use the identifier "object" in the Mustache template

    {{#object}}
    <tr>
        <td>{{name}}</td>
        <td>{{week}}</td>
        <td>{{date}}</td>
        <td>{{status}}</td>
    </tr>
    {{/object}}

Upvotes: -1

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