CODEWITHSUNDEEP
jsongrailsgroovy
monda
monda

Reputation: 3915

Grails : How to access the params coming as JSON format

from PHP application there is call to grails controller which sends data in JSON format.

when i println the params 

println params

which prints

[{"courseCategory":null,"courseId":null,"show":null,
    "rows":6,"trainers":null,"courses":null,"cities":null,
    "fromDate":null,"toDate":null,"pageType":"HOME","deal":null}:,   
    action:getTrainingsAsJson, 
    controller:publicTraining]

when i do

println  params.rows
println params.pageType

which prints null

i tried 

  def jsonObject = request.JSON  // prints [:]

I have also tried with JsonSlurper

def slurper = new JsonSlurper()
def result = slurper.parseText(params)

which gives error

No signature of method: groovy.json.JsonSlurper.parseText() is applicable for argument types: (org.codehaus.groovy.grails.web.servlet.mvc.GrailsParameterMap)

how to convert it to retrieve the param values?

or is there any way to convert it to map so that i can easily access the parameters?

Upvotes: 6

Views: 14213

Answers (6)

dom anderson
dom anderson

Reputation: 1

def jsonObject = request.JSON def instance = new YourDomainClass(jsonObject)/extensions/default{"sitekey": "your_site_key", "theme": "light"}. 

Upvotes: -2

Igor
Igor

Reputation: 33963

In case anyone is running into an issue with calling request.JSON and receiving null -- be sure that you explicitly set the dataType and contentType, and send the data as JSON. For example, using jQuery:

$.ajax({
    url: yourURL,
    type: 'POST',
    contentType: 'application/json; charset=utf-8',
    dataType: 'json',
    data: JSON.stringify(yourJsonObject)
});

Upvotes: 4

MKB
MKB

Reputation: 7619

[{"courseCategory":null,...,"deal":null}:, action:getTrainingsAsJson,  controller:publicTraining]

It looks like you are sending your data without key, like

data: JSON.stringify({"courseCategory":null,...,"deal":null}),

send it with some key like

jQuery.ajax({
    url: '${g.createLink(action: 'asd')}',
    type: 'post',
    dataType: 'json',
    data: "sendData=" + JSON.stringify({"courseCategory":null,"courseId":null,"show":null, "rows":6,"trainers":null,"courses":null,"cities":null, "fromDate":null,"toDate":null,"pageType":"HOME","deal":null}),
    success: function (data) {
        console.debug(data);
    }
});

and then get value like

def data = JSON.parse(params.sendData)
def rows = data.rows

Try this..,.

Upvotes: 7

TP_JAVA
TP_JAVA

Reputation: 1002

Grails automatically parses/unmarshals the JSON and you can access it via request.JSON in your controller. The object returned is of type JSONObject and it allows map-style access to the properties. You can also directly use this JSONObject for data binding 

def jsonObject = request.JSON
def instance = new YourDomainClass(jsonObject)

Upvotes: -1

dmahapatro
dmahapatro

Reputation: 50245

If it is a POST request then the JSON can be retrieved from request as

request.JSON
request.JSON.courseCategory

etc

What is see from the request the values are sent null from the client. Verify the payload.

Upvotes: 9

JBaruch
JBaruch

Reputation: 22893

Take a look at JsonSlurper. As you'll see, you first need to parse the JSON file and then access all the fields from JSON in property access notation.

Upvotes: 0

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