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trivialmodels

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A trivial javascript model system, designed to be easy to build backends for.

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'use strict';var _createClass=function(){function defineProperties(target,props){for(var i=0;i<props.length;i++){var descriptor=props[i];descriptor.enumerable=descriptor.enumerable||false;descriptor.configurable=true;if("value" in descriptor)descriptor.writable=true;Object.defineProperty(target,descriptor.key,descriptor);}}return function(Constructor,protoProps,staticProps){if(protoProps)defineProperties(Constructor.prototype,protoProps);if(staticProps)defineProperties(Constructor,staticProps);return Constructor;};}();Object.defineProperty(exports,"__esModule",{value:true});var _lodash=require('lodash');var _lodash2=_interopRequireDefault(_lodash);var _bluebird=require('bluebird');var _bluebird2=_interopRequireDefault(_bluebird);var _types=require('./types');var _types2=_interopRequireDefault(_types);var _errors=require('./errors');var _errors2=_interopRequireDefault(_errors);var _simpleDriver=require('../drivers/simpleDriver');var _simpleDriver2=_interopRequireDefault(_simpleDriver);var _trivialdbDriver=require('../drivers/trivialdbDriver');var _trivialdbDriver2=_interopRequireDefault(_trivialdbDriver);function _interopRequireDefault(obj){return obj&&obj.__esModule?obj:{default:obj};}function _classCallCheck(instance,Constructor){if(!(instance instanceof Constructor)){throw new TypeError("Cannot call a class as a function");}}var TrivialModel=function(){function TrivialModel(initialData){_classCallCheck(this,TrivialModel);if(!this.constructor.schema){throw new Error("A schema must be set on the model.");}if(!this.constructor.driver){throw new Error("A driver must be set on the model.");}this.$dirty=true;this.$exists=false;this.$values={};_lodash2.default.assign(this,initialData);}_createClass(TrivialModel,[{key:'$duplicate',value:function $duplicate(){return _bluebird2.default.resolve(new 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driver.set(_this3.$pk,_this3.$values,_this3).then(function(id){_this3.$values[_this3.constructor.pk]=id;}).then(function(){return _this3;});});}},{key:'$delete',value:function $delete(){var _this4=this;if(this.$exists){var pkFieldName=this.constructor.pk;var driver=this.constructor.driver;var query={};query[pkFieldName]=this.$pk;return driver.remove(query,this).then(function(){_this4.$pk=undefined;});}else {return _bluebird2.default.reject(new Error("Cannot delete a model that has not been saved yet!"));}}},{key:'toJSON',value:function toJSON(){var _this5=this;function _filterObject(object){return _lodash2.default.transform(object,function(results,value,key){if(_lodash2.default.isPlainObject(value)){results[key]=_filterObject(value);}else if(!(typeof key==='string'&&key.charAt(0)==='$')){results[key]=value;}return results;});}var schema=_filterObject(this.constructor.schema);return _lodash2.default.transform(schema,function(results,value,key){results[key]=_this5[key];});}},{key:'$pk',get:function get(){return this.$values[this.constructor.pk];},set:function set(val){this.$values[this.constructor.pk]=val;this.$dirty=true;this.$exists=false;}}],[{key:'_makeModel',value:function _makeModel(item){var inst=new this(item);inst.$dirty=false;inst.$exists=true;return inst;}},{key:'get',value:function get(pk){var _this6=this;return this.driver.get(pk,this).then(function(results){if(_lodash2.default.isArray(results)){throw new _errors2.default.MultipleDocuments(pk,_this6.name);}else if(!results){throw new _errors2.default.DocumentNotFound(pk,_this6.name);}else {return _this6._makeModel(results);}});}},{key:'all',value:function all(){var _this7=this;return this.driver.getAll(this).map(function(item){return _this7._makeModel(item);});}},{key:'filter',value:function filter(predicate){var _this8=this;return this.driver.filter(predicate,this).map(function(item){return _this8._makeModel(item);});}},{key:'query',value:function query(queryFunc){var _this9=this;return this.driver.query(queryFunc,this).then(function(items){return _lodash2.default.filter(items,function(item){return _lodash2.default.isPlainObject(item)&&!_lodash2.default.isEmpty(item);});}).map(function(item){return _this9._makeModel(item);});}},{key:'remove',value:function remove(predicate){return this.driver.remove(predicate,this);}},{key:'removeAll',value:function removeAll(){return this.driver.removeAll(this);}},{key:'setSchema',value:function setSchema(schema){var _this10=this;_lodash2.default.forIn(schema,function(value,key){if(value.$isType){Object.defineProperty(_this10.prototype,key,{get:function get(){return value.get(this,key);},set:function set(val){value.set(this,key,val);},enumerable:true});if(value.isPrimaryKey){_this10.pk=key;}}else {_this10.prototype[key]=value;}});if(!this.pk){this.pk='id';schema.id=new _types2.default.String({pk:true});Object.defineProperty(this.prototype,'id',{get:function get(){return schema.id.get(this,'id');},set:function set(val){schema.id.set(this,'id',val);},enumerable:true});}this.schema=schema;}},{key:'setDriver',value:function setDriver(driver){if(driver==undefined){throw new Error("Driver not specified.");}if(_lodash2.default.isString(driver)){driver={name:driver};}if(_lodash2.default.isPlainObject(driver)&&driver.name){var DriverClass;switch(driver.name){case 'Simple':DriverClass=_simpleDriver2.default;break;case 'TrivialDB':DriverClass=_trivialdbDriver2.default;break;default:throw new Error('Unknown Driver \''+driver.name+'\'!');break;}driver=new DriverClass(driver.options);}driver.init(this);this.driver=driver;}}]);return TrivialModel;}();exports.default=TrivialModel; //# 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TrivialModel\n///\n/// @module\n//----------------------------------------------------------------------------------------------------------------------\n\nimport _ from 'lodash';\nimport Promise from 'bluebird';\n\nimport types from './types';\nimport errors from './errors';\n\n// Drivers\nimport SimpleDriver from '../drivers/simpleDriver';\nimport TrivialDBDriver from '../drivers/trivialdbDriver';\n\n//----------------------------------------------------------------------------------------------------------------------\n\nclass TrivialModel {\n    constructor(initialData)\n    {\n        // Check to make sure we have a schema\n        if(!this.constructor.schema)\n        {\n            throw new Error(\"A schema must be set on the model.\");\n        } // end if\n\n        // Check to make sure we have a driver\n        if(!this.constructor.driver)\n        {\n            throw new Error(\"A driver must be set on the model.\");\n        } // end if\n\n        this.$dirty = true;\n        this.$exists = false;\n        this.$values = {};\n\n        _.assign(this, initialData);\n    } // end constructor\n\n    //------------------------------------------------------------------------------------------------------------------\n    // Properties\n    //------------------------------------------------------------------------------------------------------------------\n\n    get $pk(){ return this.$values[this.constructor.pk]; }\n    set $pk(val){ this.$values[this.constructor.pk] = val; this.$dirty = true; this.$exists = false; }\n\n    //------------------------------------------------------------------------------------------------------------------\n    // Instance API\n    //------------------------------------------------------------------------------------------------------------------\n\n    $duplicate()\n    {\n        return Promise.resolve(new this.constructor(_.cloneDeep(_.omit(this.$values, this.constructor.pk))));\n    } // end $duplicate\n\n    $reload()\n    {\n        var driver = this.constructor.driver;\n        return driver.get(this.$pk, this)\n            .then((results) =>\n            {\n                if(_.isArray(results))\n                {\n                    throw new errors.MultipleDocuments(this.$pk, this.constructor.name);\n                }\n                else if(!results)\n                {\n                    throw new errors.DocumentNotFound(this.$pk, this.constructor.name);\n                }\n                else\n                {\n                    this.$exists = true;\n                    this.$values = {};\n                    _.assign(this, results);\n\n                    this.$dirty = false;\n                } // end if\n            });\n    } // end $reload\n\n    $validate()\n    {\n        var schema = this.constructor.schema;\n\n        return new Promise((resolve) =>\n        {\n            _.mapValues(schema, (value, key) =>\n            {\n                // We only run validation if it's a type from our type system.\n                if(value.$isType)\n                {\n                    // This will throw an exception if it fails to validate.\n                    return value.validate(this, key);\n                } // end if\n            });\n\n            // If we get here, we're valid.\n            resolve(true);\n        });\n    } // end $validate\n\n    $save()\n    {\n        var driver = this.constructor.driver;\n        return this.$validate()\n            .then(() =>\n            {\n                return driver.set(this.$pk, this.$values, this)\n                    .then((id) =>\n                    {\n                        this.$values[this.constructor.pk] = id;\n                    })\n                    .then(() =>\n                    {\n                        return this;\n                    });\n            });\n    } // end $save\n\n    $delete()\n    {\n        if(this.$exists)\n        {\n        var pkFieldName = this.constructor.pk;\n        var driver = this.constructor.driver;\n\n        var query = {};\n        query[pkFieldName] = this.$pk;\n\n        // Remove this instance\n        return driver.remove(query, this)\n            .then(() =>\n            {\n                this.$pk = undefined;\n            });\n        }\n        else\n        {\n            return Promise.reject(new Error(\"Cannot delete a model that has not been saved yet!\"));\n        } // end if\n    } // end $delete\n\n    toJSON()\n    {\n        // Remove all keys that begin with `$`.\n        function _filterObject(object)\n        {\n            return _.transform(object, (results, value, key) =>\n            {\n                if(_.isPlainObject(value))\n                {\n                    results[key] = _filterObject(value);\n                }\n                else if(!(typeof key === 'string' && key.charAt(0) === '$'))\n                {\n                    results[key] = value;\n                } // end if\n\n                return results;\n            });\n        } // end _filterObject\n\n        var schema = _filterObject(this.constructor.schema);\n\n        return _.transform(schema, (results, value, key) => { results[key] = this[key]; });\n    } // end toJSON\n\n    //------------------------------------------------------------------------------------------------------------------\n    // Class API\n    //------------------------------------------------------------------------------------------------------------------\n\n    static _makeModel(item)\n    {\n        // Return a new instance of this Model, populated with the data from the driver.\n        var inst = new this(item);\n\n        // The instance isn't dirty, as we've just loaded it from the DB.\n        inst.$dirty = false;\n\n        // The instance exists in the database. (Required for some drivers.)\n        inst.$exists = true;\n\n        return inst;\n    } // end makeModel\n\n    static get(pk)\n    {\n        return this.driver.get(pk, this)\n            .then((results) =>\n            {\n                if(_.isArray(results))\n                {\n                    throw new errors.MultipleDocuments(pk, this.name);\n                }\n                else if(!results)\n                {\n                    throw new errors.DocumentNotFound(pk, this.name);\n                }\n                else\n                {\n                    return this._makeModel(results);\n                } // end if\n            });\n    } // end get\n\n    static all()\n    {\n        return this.driver.getAll(this)\n            .map((item) =>\n            {\n                return this._makeModel(item);\n            });\n    } // end all\n\n    static filter(predicate)\n    {\n        return this.driver.filter(predicate, this)\n            .map((item) =>\n            {\n                return this._makeModel(item);\n            });\n    } // end filter\n\n    static query(queryFunc)\n    {\n        return this.driver.query(queryFunc, this)\n            .then((items) => { return _.filter(items, (item) => _.isPlainObject(item) && !_.isEmpty(item)); })\n            .map((item) =>\n            {\n                return this._makeModel(item);\n            });\n    } // end query\n\n    static remove(predicate)\n    {\n        return this.driver.remove(predicate, this);\n    } // end remove\n\n    static removeAll()\n    {\n        return this.driver.removeAll(this);\n    } // end removeAll\n\n    //------------------------------------------------------------------------------------------------------------------\n    // Model Class creation API\n    //------------------------------------------------------------------------------------------------------------------\n\n    static setSchema(schema)\n    {\n        // Build the schema\n        _.forIn(schema, (value, key) =>\n        {\n            if(value.$isType)\n            {\n                // Define the getter/setters for the model fields\n                Object.defineProperty(this.prototype, key, {\n                    get: function() { return value.get(this, key); },\n                    set: function(val) { value.set(this, key, val); },\n                    enumerable: true\n                });\n\n                if(value.isPrimaryKey)\n                {\n                    this.pk = key;\n                } // end if\n            }\n            else\n            {\n                this.prototype[key] = value;\n            } // end if\n        });\n\n        // Ensure we always have a primary key\n        if(!this.pk)\n        {\n            this.pk = 'id';\n\n            // Add the id field to the schema\n            schema.id = new types.String({ pk: true });\n\n            // Build the getter/setter\n            Object.defineProperty(this.prototype, 'id', {\n                get: function() { return schema.id.get(this, 'id'); },\n                set: function(val) { schema.id.set(this, 'id', val); },\n                enumerable: true\n            });\n        } // end if\n\n        this.schema = schema;\n    } // end setSchema\n\n    static setDriver(driver)\n    {\n        if(driver == undefined)\n        {\n            throw new Error(\"Driver not specified.\");\n        } // end if\n\n        if(_.isString(driver))\n        {\n            driver = { name: driver };\n        } // end if\n\n        if(_.isPlainObject(driver) && driver.name)\n        {\n            var DriverClass;\n            switch(driver.name)\n            {\n                case 'Simple':\n                    DriverClass = SimpleDriver;\n                    break;\n\n                case 'TrivialDB':\n                    DriverClass = TrivialDBDriver;\n                    break;\n\n                default:\n                    throw new Error(`Unknown Driver '${ driver.name }'!`);\n                    break;\n            } // end switch\n\n            driver = new DriverClass(driver.options);\n        } // end if\n\n        // Initialize the driver\n        driver.init(this);\n\n        this.driver = driver;\n    } // end setDriver\n} // end TrivialModel\n\n//----------------------------------------------------------------------------------------------------------------------\n\nexport default TrivialModel;\n\n//----------------------------------------------------------------------------------------------------------------------\n"]}