Cannot Add Foreign Key Constraint

When running a migration with the below code, I get an “Cannot add foreign key contraint” message. Anyone point me in the right direction?

exports.up = function(knex, Promise) {
    var defer=Promise.defer();

    knex.schema.createTable('User',function(table){

        //--Create User Table
        table.increments('UserId').primary();
        table.string('username');
        table.string('email',60);
        table.string('password',65);
        table.timestamps();

    })
    .then(function(){
        return knex.schema.createTable('Comment',function(table){

            //--Create Comment Table
            table.increments('CommentId').primary();
            table.string('Comment');

            table.integer('UserId',11).inTable('User').references('UserId');

        });     
    })
    .then(function(){

            defer.resolve();
    });


    return defer.promise;

};

exports.down = function(knex, Promise) {

};  

[tgriesser]

Assuming you might be using mysql, you need to specify that the UserId is .unsigned()

You also shouldn’t need that defer there, you can just return the knex.schema.createTable.

[kamronbatman]

As an FYI to future people reading this: table.integer('UserId',11).unsigned().inTable('User').references('UserId'); is now table.integer('UserId',11).unsigned().references('UserId').inTable('User');