/**
 * Test that the $changeStream stage cannot be used in a view definition pipeline.
 */
(function() {
"use strict";

load("jstests/libs/collection_drop_recreate.js");  // For assert[Drop|Create]Collection.

const coll = assertDropAndRecreateCollection(db, "change_stream_ban_from_views");
assert.commandWorked(coll.insert({_id: 1}));

const normalViewName = "nonChangeStreamView";
const csViewName = "changeStreamView";

assertDropCollection(db, normalViewName);
assertDropCollection(db, csViewName);

const csPipe = [{$changeStream: {}}];

// Create one valid view for testing purposes.
assert.commandWorked(db.runCommand(
    {create: normalViewName, viewOn: coll.getName(), pipeline: [{$match: {_id: 1}}]}));

// Verify that we cannot create a view using a pipeline which begins with $changeStream.
assert.commandFailedWithCode(
    db.runCommand({create: csViewName, viewOn: coll.getName(), pipeline: csPipe}),
    ErrorCodes.OptionNotSupportedOnView);

// We also cannot update an existing view to use a $changeStream pipeline.
assert.commandFailedWithCode(
    db.runCommand({collMod: normalViewName, viewOn: coll.getName(), pipeline: csPipe}),
    ErrorCodes.OptionNotSupportedOnView);

// Verify change streams cannot be created on views.
assert.commandFailedWithCode(
    db.runCommand({aggregate: normalViewName, pipeline: [{$changeStream: {}}], cursor: {}}),
    ErrorCodes.CommandNotSupportedOnView);
})();