Fetching a variable inside a list in ROBOT Framework - robotframework

Question

Suppose the below is my response body
body={
"message": {
"Code": 26181,
"rollnos": [
{
"ID": 1439173,
"date_input": "2022-01-31 14:09:30.206748",
}
],
"start_date": "2022-01-31 00:00:00",
}
}
I want to set the ID value in a variable.
I have tried the below but it did not work out.
${json_response}= set variable ${xyz.json()}
${temp}= Set Variable ${json_response['message']}
${value_1}= Set Variable ${temp['rollnos']}
${register_id} = Set Variable ${value_1["ID"]
Can someone please help where I went wrong in this.

Answer 1

If you have body already as a dictionary you can use only the last 4 lines from the test example. I have included also the transformation from string to dictionary in case you need it:
*** Settings ***
Library Collections
Resource robot/resources/environment_resources.robot
*** Variables ***
${body_temp} {"message": {"Code": "26181", "rollnos": [{"ID": "1439173", "date_input": "2022-01-31 14:09:30.206748"}],"start_date": "2022-01-31 00:00:00"}}
*** Keywords ***
Converting a JSON File
${body} evaluate json.loads($body_temp) json
[Return] ${body}
*** Test Cases ***
Example
# Get body as dict
${body}= converting a json file
# Get the ID
${message} = Get From Dictionary ${body} message
${rollnos} = Get From Dictionary ${message} rollnos
${id} = Get From Dictionary ${rollnos}[0] ID
# Log the ID
Log To Console ID:${id}

Answer 2

Can someone please help where I went wrong in this.
You are treating ${temp['rollnos']} as a dictionary, but it is a list of dictionaries.
Instead of this:
${value_1}= Set Variable ${temp['rollnos']}
${register_id} = Set Variable ${value_1["ID"]
Do this, to get the ID of the first item in the dictionary:
${value_1}= Set Variable ${temp['rollnos'][0]}
# ^^^
${register_id} = Set Variable ${value_1["ID"]}

Answer 3

Well, when you say:
but it did not work out.
You don't mention what were the error messages.
This is my interpretation of your code:
${json_response}= set variable ${xyz.json()}
# ${json_response} is now a dictionary with content: body=&{message}
# So the next step would be:
${temp}= Set Variable ${json_response['body']['message']}
# And now we have: &{temp} = { Code:26181, &{rollnos}, ...
# The next code will be correct
${value_1}= Set Variable ${temp['rollnos']}
${register_id} = Set Variable ${value_1['ID']
But you got the value of ID, and you wanted to Set it, so that is another question.