pouchdb validation rules don't work in pouch AND couch

[Steve Ryan]

In the examples for pouchdb validation plugin you define a function

function validateDocUpdateTest(newDoc, oldDoc, userCtx, secObj) {
  if (newDoc._id === "myid") {
    throw {"forbidden": "Mine!!!"};
  }
}

and use that in the design view

validate_doc_update: validateDocUpdateTest.toString()

which works fine locally in pouch for validation but when the design rule is synced to a couchdb server, it becomes impossible to save anything in futon because couch complains that "Error: compilation error. Expression does not eval to a function"
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However if I define the validation function as a variable ie

var validateDocUpdateTest = function(newDoc, oldDoc, userCtx, secObj) {
  if (newDoc._id === "myid") {
    throw {"forbidden": "Mine!!!"};
  }
}

Then all is well and the validation function works both locally and inside couch.

I would have thought that defining a function as a variable or in the traditional way would make to difference to the face that validateDocUpdate is a function object but toString on the function includes the name of the function whereas toString on the variable version does not and everything is OK. Wierd.
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End of the day, might be worth updating your documentation to use the variable version so that things work client and server.

[Marten de Vries (marten-de-vries)]

I think the problem is that CouchDB expects an expression and gets a statement, where in the browser because of a slightly different context, the statement is converted to an expression.

Anyway, I agree it's confusing and that the documentation should just use the 'var ... = function () {}' form you described. Will change it before the next version.

Thanks for reporting!

[Marten de Vries (marten-de-vries)]

Migrated to: https://github.com/pouchdb/pouchdb-validation/issues/1