postgres full text search in sequelize.js. see this blog post for more information http://www.mathisonian.com/weblog/postgres-full-text-search-with-sequelizejs

index.js

var Sequelize = require('sequelize');

module.exports = function(config) {
    
    var models = {};
    sequelize = new Sequelize(config.database, config.username, config.password, config.options);


    // Bootstrap models
    fs.readdirSync(__dirname).forEach(function (file) {
        if (~file.indexOf('.js') && file.indexOf('index.js') < 0) {
            var model = sequelize.import(file);
            console.log(model.name);
            models[model.name] = model;
        }
    });

    sequelize.sync().done(function() {
        models.Post.addFullTextIndex();
    });

}

post.js

'use strict';


module.exports = function(sequelize, DataTypes) {
    return sequelize.define('Post', {
        'title': { type: DataTypes.STRING, required: true },
        'content': { type: DataTypes.TEXT, required: true },
        'slug': { type: DataTypes.STRING, required: true }
    }, {
        classMethods: {

            getSearchVector: function() {
                return 'PostText';
            },

            addFullTextIndex: function() {

                if(sequelize.options.dialect !== 'postgres') {
                    console.log('Not creating search index, must be using POSTGRES to do this');
                    return;
                }

                var searchFields = ['title', 'content'];
                var Post = this;

                var vectorName = Post.getSearchVector();
                sequelize
                    .query('ALTER TABLE "' + Post.tableName + '" ADD COLUMN "' + vectorName + '" TSVECTOR')
                    .success(function() {
                        return sequelize
                                .query('UPDATE "' + Post.tableName + '" SET "' + vectorName + '" = to_tsvector(\'english\', ' + searchFields.join(' || \' \' || ') + ')')
                                .error(console.log);
                    }).success(function() {
                        return sequelize
                                .query('CREATE INDEX post_search_idx ON "' + Post.tableName + '" USING gin("' + vectorName + '");')
                                .error(console.log);
                    }).success(function() {
                        return sequelize
                                .query('CREATE TRIGGER post_vector_update BEFORE INSERT OR UPDATE ON "' + Post.tableName + '" FOR EACH ROW EXECUTE PROCEDURE tsvector_update_trigger("' + vectorName + '", \'pg_catalog.english\', ' + searchFields.join(', ') + ')')
                                .error(console.log);
                    }).error(console.log);

            },

            search: function(query) {
                if(sequelize.options.dialect !== 'postgres') {
                    console.log('Search is only implemented on POSTGRES database');
                    return;
                }

                var Post = this;

                query = sequelize.getQueryInterface().escape(query);
                console.log(query);
                
                return sequelize
                        .query('SELECT * FROM "' + Post.tableName + '" WHERE "' + Post.getSearchVector() + '" @@ plainto_tsquery(\'english\', ' + query + ')', Post);
            }
        }
    });
};

Here's an updated migration version for adding the fields / indexes and that works with newer versions of Seqelize

'use strict';

module.exports = {
  up: function (queryInterface, Sequelize) {
    var sequelize = queryInterface.sequelize,
        searchFields = ['name', 'description'],
        vectorName = "[column_name]",
        tableName = "[table_name]";

    return sequelize
      .query('ALTER TABLE "' + tableName + '" ADD COLUMN "' + vectorName + '" TSVECTOR')
      .then(function() {
        console.log("Column added: Adding updating values")
        return sequelize
                .query('UPDATE "' + tableName + '" SET "' + vectorName + '" = to_tsvector(\'english\', ' + searchFields.join(' || \' \' || ') + ')')
                .catch(console.log);
      }).then(function() {
        console.log("Values added: Creating Index")
        return sequelize
                .query('CREATE INDEX np_search_idx ON "' + tableName + '" USING gin("' + vectorName + '");')
                .catch(console.log);
      }).then(function() {
        console.log("Index created: Adding trigger");
        return sequelize
                .query('CREATE TRIGGER np_vector_update BEFORE INSERT OR UPDATE ON "' + tableName + '" FOR EACH ROW EXECUTE PROCEDURE tsvector_update_trigger("' + vectorName + '", \'pg_catalog.english\', ' + searchFields.join(', ') + ')')
                .catch(console.log);
      }).then(function() {
        console.log("Everything worked!")
      }).catch(console.log);
  },

  down: function (queryInterface, Sequelize) {
    var sequelize = queryInterface.sequelize,
        searchFields = ['name', 'description'],
        vectorName = "[column_name]",
        tableName = "[table_name]";
        
    return sequelize
      .query('DROP TRIGGER np_vector_update ON "' + tableName + '"')
      .then(function(){
        console.log("removed trigger")
        return sequelize
                .query("DROP INDEX np_search_idx")
                .catch(console.log)
      }).then(function(){
        console.log("removed index")
        return sequelize
                .query('ALTER TABLE "' + tableName + '" DROP COLUMN "' + vectorName + '"')
                .catch(console.log)
      }).then(function(){
        console.log("removed column")
      }).catch(console.log)
  }
};

@hobberwickey interesting, you added the tsvector column to migration, what did you add in your model files, I cannot find anything called DataType.TS_VECTOR or DataType.DOCUMENT for Sequelize