While working with [waterline] I kept getting the following error:

Cannot read property 'identity' of undefined

It took me a bit to figure it out, but it turns out the problem was on the identity definition. After some fiddling around it turned out that the offending model had this definition:

var PackageTransaction = Waterline.Collection.extend({
    identity: 'packageTransaction',
    connection: 'default',
    attributes:{}
});

The problem was on packageTransaction being camel cased, and apparently waterline does not like it.

var PackageTransaction = Waterline.Collection.extend({
    identity: 'packagetransaction',
    connection: 'default',
    attributes:{}
});

The full stack trace looks like this:

/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/adapter/sync/strategies/alter.js:41 = _.find(self.query.waterline.schema, {tableName: self.collection}).identity; ^ TypeError: Cannot read property 'identity' of undefined at afterDescribe (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/adapter/sync/strategies/alter.js:41:91) at wrapper (/Users/goliatone/Dev/postman/node_modules/waterline/node_modules/lodash/index.js:3602:19) at applyInOriginalCtx (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/utils/normalize.js:421:80) at wrappedCallback (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/utils/normalize.js:320:18) at _normalizeCallback.callback.success (/Users/goliatone/Dev/postman/node_modules/waterline/node_modules/switchback/lib/normalize.js:33:31) at _switch (/Users/goliatone/Dev/postman/node_modules/waterline/node_modules/switchback/lib/factory.js:48:28) at /Users/goliatone/Dev/postman/node_modules/sails-disk/lib/database.js:262:5 at Database.getCollection (/Users/goliatone/Dev/postman/node_modules/sails-disk/lib/database.js:141:3) at Database.describe (/Users/goliatone/Dev/postman/node_modules/sails-disk/lib/database.js:258:8) at Object.module.exports.adapter.describe (/Users/goliatone/Dev/postman/node_modules/sails-disk/lib/adapter.js:72:28) at module.exports.describe (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/adapter/ddl/index.js:80:13) at module.exports [as migrateAlter] (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/adapter/sync/strategies/alter.js:34:8) at Query.sync (/Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline/query/index.js:68:37) at /Users/goliatone/Dev/postman/node_modules/waterline/lib/waterline.js:288:16 at /Users/goliatone/Dev/postman/node_modules/waterline/node_modules/async/lib/async.js:162:20 at iterate (/Users/goliatone/Dev/postman/node_modules/waterline/node_modules/async/lib/async.js:256:13)