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| /**
* Dynamic Queries
*
* Query the collection using the name of the attribute directly
*/
var _ = require('lodash');
var usageError = require('../../utils/usageError');
var utils = require('../../utils/helpers');
var normalize = require('../../utils/normalize');
var hasOwnProperty = utils.object.hasOwnProperty;
var finder = module.exports = {};
/**
* buildDynamicFinders
*
* Attaches shorthand dynamic methods to the prototype for each attribute
* in the schema.
*/
finder.buildDynamicFinders = function() {
var self = this;
// For each defined attribute, create a dynamic finder function
Object.keys(this._attributes).forEach(function(attrName) {
// Check if attribute is an association, if so generate limited dynamic finders
if (hasOwnProperty(self._schema.schema[attrName], 'foreignKey')) {
if (self.associationFinders !== false) {
self.generateAssociationFinders(attrName);
}
return;
}
var capitalizedMethods = ['findOneBy*', 'findOneBy*In', 'findOneBy*Like', 'findBy*', 'findBy*In',
'findBy*Like', 'countBy*', 'countBy*In', 'countBy*Like'];
var lowercasedMethods = ['*StartsWith', '*Contains', '*EndsWith'];
if (self.dynamicFinders !== false) {
capitalizedMethods.forEach(function(method) {
self.generateDynamicFinder(attrName, method);
});
lowercasedMethods.forEach(function(method) {
self.generateDynamicFinder(attrName, method, true);
});
}
});
};
/**
* generateDynamicFinder
*
* Creates a dynamic method based off the schema. Used for shortcuts for various
* methods where a criteria object can automatically be built.
*
* @param {String} attrName
* @param {String} method
* @param {Boolean} dont capitalize the attrName or do, defaults to false
*/
finder.generateDynamicFinder = function(attrName, method, dontCapitalize) {
var self = this;
var criteria;
// Capitalize Attribute Name for camelCase
var preparedAttrName = dontCapitalize ? attrName : utils.capitalize(attrName);
// Figure out actual dynamic method name by injecting attribute name
var actualMethodName = method.replace(/\*/g, preparedAttrName);
// Assign this finder to the collection
this[actualMethodName] = function dynamicMethod(value, options, cb) {
if (typeof options === 'function') {
cb = options;
options = null;
}
options = options || {};
var usage = utils.capitalize(self.identity) + '.' + actualMethodName + '(someValue,[options],callback)';
Iif (typeof value === 'undefined') return usageError('No value specified!', usage, cb);
Iif (options.where) return usageError('Cannot specify `where` option in a dynamic ' + method + '*() query!', usage, cb);
// Build criteria query and submit it
options.where = {};
options.where[attrName] = value;
switch (method) {
///////////////////////////////////////
// Finders
///////////////////////////////////////
case 'findOneBy*':
case 'findOneBy*In':
return self.findOne(options, cb);
case 'findOneBy*Like':
criteria = _.extend(options, {
where: {
like: options.where
}
});
return self.findOne(criteria, cb);
///////////////////////////////////////
// Aggregate Finders
///////////////////////////////////////
case 'findBy*':
case 'findBy*In':
return self.find(options, cb);
case 'findBy*Like':
criteria = _.extend(options, {
where: {
like: options.where
}
});
return self.find(criteria, cb);
///////////////////////////////////////
// Count Finders
///////////////////////////////////////
case 'countBy*':
case 'countBy*In':
return self.count(options, cb);
case 'countBy*Like':
criteria = _.extend(options, {
where: {
like: options.where
}
});
return self.count(criteria, cb);
///////////////////////////////////////
// Searchers
///////////////////////////////////////
case '*StartsWith':
return self.startsWith(options, cb);
case '*Contains':
return self.contains(options, cb);
case '*EndsWith':
return self.endsWith(options, cb);
}
};
};
/**
* generateAssociationFinders
*
* Generate Dynamic Finders for an association.
* Adds a .findBy<name>() method for has_one and belongs_to associations.
*
* @param {String} attrName, the column name of the attribute
*/
finder.generateAssociationFinders = function(attrName) {
var self = this;
var name, model;
// Find the user defined key for this attrName, look in self defined columnName
// properties and if that's not set see if the generated columnName matches the attrName
for (var key in this._attributes) {
// Cache the value
var cache = this._attributes[key];
if (!hasOwnProperty(cache, 'model')) continue;
Iif (cache.model.toLowerCase() + '_id' === attrName) {
name = key;
model = cache.model;
}
}
Eif (!name || !model) return;
// Build a findOneBy<attrName> dynamic finder that forces a join on the association
this['findOneBy' + utils.capitalize(name)] = function dynamicAssociationMethod(value, cb) {
// Check proper usage
var usage = utils.capitalize(self.identity) + '.' + 'findBy' + utils.capitalize(name) +
'(someValue, callback)';
if (typeof value === 'undefined') return usageError('No value specified!', usage, cb);
if (typeof value === 'function') return usageError('No value specified!', usage, cb);
var criteria = associationQueryCriteria(self, value, attrName);
return this.findOne(criteria, cb);
};
// Build a findBy<attrName> dynamic finder that forces a join on the association
this['findBy' + utils.capitalize(name)] = function dynamicAssociationMethod(value, cb) {
// Check proper usage
var usage = utils.capitalize(self.identity) + '.' + 'findBy' + utils.capitalize(name) +
'(someValue, callback)';
if (typeof value === 'undefined') return usageError('No value specified!', usage, cb);
if (typeof value === 'function') return usageError('No value specified!', usage, cb);
var criteria = associationQueryCriteria(self, value, attrName);
return this.find(criteria, cb);
};
};
/**
* Build Join Array
*/
function buildJoin() {
var self = this;
var pk, attr;
// Set the attr value to the generated schema attribute
attr = self.waterline.schema[self.identity].attributes[name];
// Get the current collection's primary key attribute
Object.keys(self._attributes).forEach(function(key) {
if (hasOwnProperty(self._attributes[key], 'primaryKey') && self._attributes[key].primaryKey) {
pk = key;
}
});
if (!attr) throw new Error('Attempting to populate an attribute that doesn\'t exist');
// Grab the key being populated to check if it is a has many to belongs to
// If it's a belongs_to the adapter needs to know that it should replace the foreign key
// with the associated value.
var parentKey = self.waterline.collections[self.identity].attributes[name];
// Build the initial join object that will link this collection to either another collection
// or to a junction table.
var join = {
parent: self._tableName,
parentKey: attr.columnName || pk,
child: attr.references,
childKey: attr.on,
select: true,
removeParentKey: !!parentKey.model
};
return join;
}
/**
* Query Criteria Builder for associations
*/
function associationQueryCriteria(context, value, attrName) {
// Build a criteria object
var criteria = {
where: {},
joins: []
};
// Build a join condition
var join = buildJoin.call(context);
criteria.joins.push(join);
// Add where values
criteria.where[attrName] = value;
return criteria;
}
|