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I have to add some data to body of my content type, how do I add it in hook_node_save. I tried adding it like shown below but it's not getting saved.

function mymodule_node_save($node) {
$node->body = 'test string';
}

Also when I do dsm($node) in the above function, the $node->body doesn't contain the string I added.

3

There's no such hook as hook_node_save(), you're probably looking for hook_node_presave()

Act on a node being inserted or updated.

Also, the nody body is a field so you have to treat it as such when assigning values:

function mymodule_node_presave($node) {
  $node->body[LANGUAGE_NONE][0]['value'] = 'test string';
}

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