diff --git a/lib/index.js b/lib/index.js
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+++ b/lib/index.js
@@ -0,0 +1,333 @@
+const errors = require('@feathersjs/errors');
+const { _ } = require('@feathersjs/commons');
+const { select, AdapterService } = require('@feathersjs/adapter-commons');
+
+const hooks = require('./hooks');
+const utils = require('./utils');
+
+const defaultOperators = Op => {
+  return {
+    $eq: Op.eq,
+    $ne: Op.ne,
+    $gte: Op.gte,
+    $gt: Op.gt,
+    $lte: Op.lte,
+    $lt: Op.lt,
+    $in: Op.in,
+    $nin: Op.notIn,
+    $like: Op.like,
+    $notLike: Op.notLike,
+    $iLike: Op.iLike,
+    $notILike: Op.notILike,
+    $or: Op.or,
+    $and: Op.and
+  };
+};
+
+class Service extends AdapterService {
+  constructor (options) {
+    let Sequelize;
+    if (options.Model) {
+      Sequelize = options.Model.sequelize.Sequelize;
+    } else if (options.Sequelize) {
+      Sequelize = options.Sequelize;
+    } else {
+      throw new Error('You must provide a Sequelize Model or the Sequelize class');
+    }
+
+    const defaultOps = defaultOperators(Sequelize.Op);
+    const operators = Object.assign(defaultOps, options.operators);
+    const whitelist = Object.keys(operators).concat(options.whitelist || []);
+    const { primaryKeyAttributes } = options.Model;
+    const id = typeof primaryKeyAttributes === 'object' && primaryKeyAttributes[0] !== undefined
+      ? primaryKeyAttributes[0]
+      : 'id';
+
+    super(Object.assign({ id }, options, { operators, whitelist }));
+    this.raw = options.raw !== false;
+  }
+
+  get Op () {
+    return this.options.Model.sequelize.Sequelize.Op;
+  }
+
+  get Model () {
+    if (!this.options.Model) {
+      throw new Error('The Model getter was called with no Model provided in options!');
+    }
+
+    return this.options.Model;
+  }
+
+  getModel (params) {
+    if (!this.options.Model) {
+      throw new Error('getModel was called without a Model present in the constructor options and without overriding getModel! Perhaps you intended to override getModel in a child class?');
+    }
+
+    return this.options.Model;
+  }
+
+  applyScope (params = {}) {
+    if ((params.sequelize || {}).scope) {
+      return this.getModel(params).scope(params.sequelize.scope);
+    }
+    return this.getModel(params);
+  }
+
+  filterQuery (params = {}) {
+    const filtered = super.filterQuery(params);
+    const operators = this.options.operators;
+    const convertOperators = query => {
+      if (Array.isArray(query)) {
+        return query.map(convertOperators);
+      }
+
+      if (!utils.isPlainObject(query)) {
+        return query;
+      }
+
+      const converted = Object.keys(query).reduce((result, prop) => {
+        const value = query[prop];
+        const key = operators[prop] ? operators[prop] : prop;
+
+        result[key] = convertOperators(value);
+
+        return result;
+      }, {});
+
+      Object.getOwnPropertySymbols(query).forEach(symbol => {
+        converted[symbol] = query[symbol];
+      });
+
+      return converted;
+    };
+
+    filtered.query = Object.assign({}, convertOperators(filtered.query));
+
+    return filtered;
+  }
+
+  // returns either the model intance for an id or all unpaginated
+  // items for `params` if id is null
+  _getOrFind (id, params = {}) {
+    if (id === null) {
+      return this._find(Object.assign(params, {
+        paginate: false
+      }));
+    }
+
+    return this._get(id, params);
+  }
+
+  _find (params = {}) {
+    const { filters, query: where, paginate } = this.filterQuery(params);
+    const order = utils.getOrder(filters.$sort);
+
+    const q = Object.assign({
+      where,
+      order,
+      limit: filters.$limit,
+      offset: filters.$skip,
+      raw: this.raw,
+      distinct: true
+    }, params.sequelize);
+
+    if (filters.$select) {
+      q.attributes = filters.$select.map(select => `${select}`);
+    }
+
+    const Model = this.applyScope(params);
+
+    // Until Sequelize fix all the findAndCount issues, a few 'hacks' are needed to get the total count correct
+
+    // Adding an empty include changes the way the count is done
+    // See: https://github.com/sequelize/sequelize/blob/7e441a6a5ca44749acd3567b59b1d6ceb06ae64b/lib/model.js#L1780-L1782
+    q.include = q.include || [];
+
+    if (paginate && paginate.default) {
+      return Model.findAndCountAll(q).then(result => {
+        return {
+          total: result.count,
+          limit: filters.$limit,
+          skip: filters.$skip || 0,
+          data: result.rows
+        };
+      }).catch(utils.errorHandler);
+    }
+
+    return Model.findAll(q).catch(utils.errorHandler);
+  }
+
+  _get (id, params = {}) {
+    const { query: where } = this.filterQuery(params);
+
+    const { and } = this.Op;
+    // Attach 'where' constraints, if any were used.
+    const q = Object.assign({
+      raw: this.raw,
+      where: Object.assign(where, {
+        [and]: where[and] ? [...where[and], { [this.id]: id }] : { [this.id]: id }
+      })
+    }, params.sequelize);
+
+    const Model = this.applyScope(params);
+
+    // findById calls findAll under the hood. We use findAll so that
+    // eager loading can be used without a separate code path.
+    return Model.findAll(q).then(result => {
+      if (result.length === 0) {
+        throw new errors.NotFound(`No record found for id '${id}'`);
+      }
+
+      return result[0];
+    }).then(select(params, this.id)).catch(utils.errorHandler);
+  }
+
+  _create (data, params = {}) {
+    const options = Object.assign({ raw: this.raw }, params.sequelize);
+    // Model.create's `raw` option is different from other methods.
+    // In order to use `raw` consistently to serialize the result,
+    // we need to shadow the Model.create use of raw, which we provide
+    // access to by specifying `ignoreSetters`.
+    const ignoreSetters = Boolean(options.ignoreSetters);
+    const createOptions = Object.assign({
+      returning: true
+    }, options, { raw: ignoreSetters });
+    const isArray = Array.isArray(data);
+    const Model = this.applyScope(params);
+    const promise = isArray
+      ? Model.bulkCreate(data, createOptions)
+      : Model.create(data, createOptions);
+
+    return promise.then(result => {
+      const sel = select(params, this.id);
+      if (options.raw === false) {
+        return result;
+      }
+      if (isArray) {
+        return result.map(item => sel(item.toJSON()));
+      }
+      return sel(result.toJSON());
+    }).catch(utils.errorHandler);
+  }
+
+  _patch (id, data, params = {}) {
+    const Model = this.applyScope(params);
+
+    // Get a list of ids that match the id/query. Overwrite the
+    // $select because only the id is needed for this idList
+    const idQuery = Object.assign({}, params.query, { $select: [this.id] });
+    const idParams = Object.assign({}, params, { query: idQuery });
+
+    const ids = this._getOrFind(id, idParams).then(result => {
+      const items = Array.isArray(result) ? result : [result];
+      return items.map(item => item[this.id]);
+    });
+
+    return ids.then(idList => {
+      // Create a new query that re-queries all ids that
+      // were originally changed
+      const findQuery = Object.assign(
+        { [this.id]: { $in: idList } },
+        this.filterQuery(params).filters
+      );
+
+      const findParams = Object.assign({}, params, { query: findQuery });
+
+      const seqOptions = Object.assign(
+        { raw: this.raw },
+        params.sequelize,
+        { where: { [this.id]: { [this.Op.in]: idList } } }
+      );
+
+      return Model.update(_.omit(data, this.id), seqOptions)
+        .then(() => {
+          if (params.$returning !== false) {
+            return this._getOrFind(id, findParams);
+          } else {
+            return Promise.resolve([]);
+          }
+        });
+    }).then(select(params, this.id)).catch(utils.errorHandler);
+  }
+
+  _update (id, data, params = {}) {
+    const where = Object.assign({}, this.filterQuery(params).query);
+
+    // Force the {raw: false} option as the instance is needed to properly
+    // update
+    const seqOptions = Object.assign({}, params.sequelize, { raw: false });
+
+    return this._get(id, { sequelize: seqOptions, query: where }).then(instance => {
+      const copy = Object.keys(instance.toJSON()).reduce((result, key) => {
+        result[key] = typeof data[key] === 'undefined' ? null : data[key];
+
+        return result;
+      }, {});
+
+      return instance.update(copy, seqOptions)
+        .then(() => this._get(id, {
+          sequelize: Object.assign({}, seqOptions, {
+            raw: typeof (params.sequelize || {}).raw !== 'undefined'
+              ? params.sequelize.raw
+              : this.raw
+          })
+        }));
+    })
+      .then(select(params, this.id))
+      .catch(utils.errorHandler);
+  }
+
+  _remove (id, params = {}) {
+    const Model = this.applyScope(params);
+
+    if (params.$returning === false) {
+      params = {
+        ...params,
+        query: {
+          ...params.query,
+          $select: [this.id]
+        }
+      };
+    } else if (params.query && params.query.$select) {
+      params = {
+        ...params,
+        query: {
+          ...params.query,
+          $select: [...params.query.$select, this.id]
+        }
+      };
+    }
+
+    return this._getOrFind(id, params).then(results => {
+      const items = Array.isArray(results) ? results : [results];
+      const idList = items.map(item => item[this.id]);
+
+      const seqOptions = Object.assign(
+        { raw: this.raw },
+        params.sequelize,
+        { where: { [this.id]: { [this.Op.in]: idList } } }
+      );
+
+      return Model.destroy(seqOptions)
+        .then(() => {
+          if (params.$returning === false) {
+            return Promise.resolve([]);
+          } else {
+            return results;
+          }
+        });
+    }).then(select(params, this.id)).catch(utils.errorHandler);
+  }
+}
+
+const init = options => new Service(options);
+
+// Exposed Modules
+module.exports = Object.assign(init, {
+  default: init,
+  ERROR: utils.ERROR,
+  hooks,
+  Service
+});
+