AWS API Gateway as proxy to dynamo DB HTTP Get mapping template - amazon-web-services

Question

I have a API gateway which does a get to the tables stored in dynamo DB.
The table stored looks like as JSON as show below
{
"photos": {
"page": 1,
"pages": "1234",
"perpage": 100,
"photo": [
{
"farm": 1,
"id": "12345678901",
"isfamily": 0,
"isfriend": 0,
"ispublic": 1,
"owner": "23456789#A12",
"secret": "abc123d456",
"server": "1234",
"title": "Sample photo 1"
},
{
"farm": 2,
"id": "23456789012",
"isfamily": 0,
"isfriend": 0,
"ispublic": 1,
"owner": "34567890#B23",
"secret": "bcd234e567",
"server": "2345",
"title": "Sample photo 2"
}
],
"total": "123398"
},
"srini": "srini"
}
With out integration response mapping template I get the table as shown below
{
"Count": 1, "Items": [
{
"photos": {
"M": {
"photo": {
"L": [
{
"M": {
"owner": {
"S": "23456789#A12"
},
"server": {
"S": "1234"
},
"ispublic": {
"N": "1"
},
"isfriend": {
"N": "0"
},
"farm": {
"N": "1"
},
"id": {
"S": "12345678901"
},
"secret": {
"S": "abc123d456"
},
"title": {
"S": "Sample photo 1"
},
"isfamily": {
"N": "0"
}
}
},
{
"M": {
"owner": {
"S": "34567890#B23"
},
"server": {
"S": "2345"
},
"ispublic": {
"N": "1"
},
"isfriend": {
"N": "0"
},
"farm": {
"N": "2"
},
"id": {
"S": "23456789012"
},
"secret": {
"S": "bcd234e567"
},
"title": {
"S": "Sample photo 2"
},
"isfamily": {
"N": "0"
}
}
}
]
},
"perpage": {
"N": "100"
},
"total": {
"S": "123398"
},
"pages": {
"S": "1234"
},
"page": {
"N": "1"
}
}
},
"srini": {
"S": "srini"
}
} ], "ScannedCount": 1
}
I am trying to retrieve in the JSON format so that web client takes the table from Dynamo in JSON format .The mapping template I am trying to write is as follows
#set($inputRoot = $input.path('$'))
{
#foreach($elem in $inputRoot.Items) {
"srini": "$elem.srini.S",
"pages": "$elem.photos.pages.S",
#foreach($elemnext in $elem.photos.photo) {
"id": "$elemnext.id.S"
}#if($foreach.hasNext),#end
#end
}#if($foreach.hasNext),#end
#end
}
I only can retrieve srini as show below
Response Body
{
{
"srini": "srini",
"pages": ""
}
}
All other data is not retreived ,What is the right way to write mapping template ,Can any one let me know please?

Answer 1

#set($inputRoot = $input.path('$'))
{
#foreach($elem in $inputRoot.Items) {
"srini": "$elem.srini.S",
"pages": "$elem.photos.M.pages.S",
#foreach($elemnext in $elem.photos.M.photo.L)
{
"id": "$elemnext.M.id.S"
} #if($foreach.hasNext),#end
#end
}#if($foreach.hasNext),#end
#end
}