Grails 3 - Spring Rest Docs using Rest assured giving SnippetException when using JSON views

I am trying to integrate Spring REST docs with rest assured with Grails 3.1.4 application. I am using JSON Views.

Complete code is at https://github.com/rohitpal99/rest-docs

In NoteController when I use

List<Note> noteList = Note.findAll()
Map response = [totalCount: noteList.size(), type: "note"]
render response as grails.converters.JSON

Document generation works well.

But I want to use JSON views like

respond Note.findAll()

where I have _notes.gson and index.gson files in /views directory. I get a SnippetException. A usual /notes GET request response is correct.

rest.docs.ApiDocumentationSpec > test and document get request for /index FAILED
    org.springframework.restdocs.snippet.SnippetException at ApiDocumentationSpec.groovy:54

with no message. Unable to track why it occurs. Please suggest.

Full stacktrace

    org.springframework.restdocs.snippet.SnippetException: The following parts of the payload were not documented:
{
  "instanceList" : [ {
    "title" : "Hello, World!",
    "body" : "Integration Test from Hello"
  }, {
    "title" : "Hello, Grails",
    "body" : "Integration Test from Grails"
  } ]
}
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.validateFieldDocumentation(AbstractFieldsSnippet.java:134)
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.createModel(AbstractFieldsSnippet.java:74)
    at org.springframework.restdocs.snippet.TemplatedSnippet.document(TemplatedSnippet.java:64)
    at org.springframework.restdocs.generate.RestDocumentationGenerator.handle(RestDocumentationGenerator.java:192)
    at org.springframework.restdocs.restassured.RestDocumentationFilter.filter(RestDocumentationFilter.java:63)
    at com.jayway.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:73)
    at org.springframework.restdocs.restassured.RestAssuredRestDocumentationConfigurer.filter(RestAssuredRestDocumentationConfigurer.java:65)
    at com.jayway.restassured.internal.filter.FilterContextImpl.next(FilterContextImpl.groovy:73)
    at com.jayway.restassured.internal.RequestSpecificationImpl.applyPathParamsAndSendRequest(RequestSpecificationImpl.groovy:1574)
    at com.jayway.restassured.internal.RequestSpecificationImpl.get(RequestSpecificationImpl.groovy:159)
    at rest.docs.ApiDocumentationSpec.$tt__$spock_feature_0_0(ApiDocumentationSpec.groovy:54)
    at rest.docs.ApiDocumentationSpec.test and document get request for /index_closure2(ApiDocumentationSpec.groovy)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:442)
    at grails.transaction.GrailsTransactionTemplate$1.doInTransaction(GrailsTransactionTemplate.groovy:70)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
    at grails.transaction.GrailsTransactionTemplate.executeAndRollback(GrailsTransactionTemplate.groovy:67)
    at rest.docs.ApiDocumentationSpec.test and document get request for /index(ApiDocumentationSpec.groovy)

REST Docs will fail a test if you try to document something that isn't there or fail to document something that is there. You've documented two fields in your test:

responseFields(
    fieldWithPath('totalCount').description('Total count'),
    fieldWithPath('type').description("Type of result")
)))

REST Docs has failed the test as some parts of the response haven't been documented. Specifically an instanceList array that contains maps with two keys: title and body. You can document those and the other two fields with something like this:

responseFields(
    fieldWithPath('totalCount').description('Total count'),
    fieldWithPath('type').description("Type of result"),
    fieldWithPath('instanceList[].title').description('Foo'),
    fieldWithPath('instanceList[].body').description('Bar')
)))