Grails - JSON binding causing JSONException

Question

I have the following controller code:

def save(MyModel model) {
    model.save()
}

And I'm testing it using:

//e.g. 2ff59e55-ee3d-4f66-8bfa-00f355f52c49
def uuid = UUID.randomUUID.toString()
controller.request.contentType = JSON_CONTENT_TYPE
controller.request.method = 'POST'
controller.request.json = "{'uuid': '$uuid', 'description': 'test object', 'count': 1}"
controller.save()

However, every time I run the test I get,

org.apache.commons.lang.UnhandledException:
org.codehaus.groovy.grails.web.converters.exceptions.ConverterException:
org.codehaus.groovy.grails.web.json.JSONException: Value out of sequence: expected mode to be
OBJECT or ARRAY when writing '{'uuid': '2ff59e55-ee3d-4f66-8bfa-00f355f52c49', 'description': 'test object', 'count': 1}' but was INIT

String uuid = UUID.randomUUID().toString() and /{'uuid': "$uuid", 'description': 'test object'}/. Use slashy String in order to use " for GString. — dmahapatro
– dmahapatro, Commented Jun 4, 2014 at 15:19
Oops. I updated the question to correct the uuid part; it was just a typo. I tested again with the GString delimited by /.../ but I'm still getting the error. — Psycho Punch
– Psycho Punch, Commented Jun 4, 2014 at 15:26

Kyle · Accepted Answer · 2016-03-07 19:31:58Z

1

The JSON converter chokes on Groovy Strings. I've solved this by slapping a .toString() on the end: "{'uuid':'$uuid'}".toString().

answered Mar 7, 2016 at 19:31

Kyle

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MKB · Accepted Answer · 2014-06-04 18:36:39Z

0

Try this

void "Test the save action correctly persists an instance"() {
    when:
    Integer originalCount = MyModel.count()
    String uuid = UUID.randomUUID().toString()
    controller.request.contentType = 'application/json'
    controller.request.method = 'POST'
    controller.request.json = ['uuid': uuid, 'description': 'test object'] as JSON
    controller.save()

    then:
    assert originalCount + 1 == MyModel.count()
}

edited Jun 4, 2014 at 18:36

answered Jun 4, 2014 at 17:37

MKB

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6 Comments

Psycho Punch Over a year ago

This worked using grails.converters.JSON. There was another JSON type option but I did not try it anymore because the one I mentioned worked on my first try. I'm familiar with the as keyword, but I'm curious why the GString wouldn't work and this one would...

Psycho Punch Over a year ago

Ok, so while it does not generate the error, it's not setting the properties either. Actually it looks like JSON binding isn't working at all, even just using {'description': 'test object'} does not set the description property.

MKB Over a year ago

I have updated my answer. It is passing. Assert statement pass that means we have one more entry in MyModel.

MKB Over a year ago

And for your first comment question, I don't have reason for that but "{'uuid':" + uuid + ", 'description': 'test object'}" is also working..,.

Psycho Punch Over a year ago

The updated test code looks pretty similar to what I have, and it's passing (i.e. the count gets updated). However, the model in the controller does not have any data in it. For example, model.description is null. What version of Grails are you testing this with?

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