lib/waterline/methods/remove-from-collection.js
/**
* Module dependencies
*/
var assert = require('assert');
var _ = require('@sailshq/lodash');
var async = require('async');
var flaverr = require('flaverr');
var parley = require('parley');
var buildOmen = require('../utils/query/build-omen');
var forgeStageTwoQuery = require('../utils/query/forge-stage-two-query');
var getQueryModifierMethods = require('../utils/query/get-query-modifier-methods');
var verifyModelMethodContext = require('../utils/query/verify-model-method-context');
/**
* Module constants
*/
var DEFERRED_METHODS = getQueryModifierMethods('removeFromCollection');
/**
* removeFromCollection()
*
* Remove a subset of the members from the specified collection in each of the target record(s).
*
* ```
* // For users 3 and 4, remove pets 99 and 98 from their "pets" collection.
* // > (if either user record does not actually have one of those pets in its "pets",
* // > then we just silently skip over it)
* User.removeFromCollection([3,4], 'pets', [99,98]).exec(...);
* ```
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* Usage without deferred object:
* ================================================
*
* @param {Array?|String?|Number?} targetRecordIds
*
* @param {String?} collectionAttrName
*
* @param {Array?} associatedIds
*
* @param {Function?} explicitCbMaybe
* Callback function to run when query has either finished successfully or errored.
* (If unspecified, will return a Deferred object instead of actually doing anything.)
*
* @param {Ref?} meta
* For internal use.
*
* @returns {Ref?} Deferred object if no `explicitCbMaybe` callback was provided
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* The underlying query keys:
* ==============================
*
* @qkey {Array|String|Number} targetRecordIds
* The primary key value(s) (i.e. ids) for the parent record(s).
* Must be a number or string; e.g. '507f191e810c19729de860ea' or 49
* Or an array of numbers or strings; e.g. ['507f191e810c19729de860ea', '14832ace0c179de897'] or [49, 32, 37]
* If an empty array (`[]`) is specified, then this is a no-op.
*
* @qkey {String} collectionAttrName
* The name of the collection association (e.g. "pets")
*
* @qkey {Array} associatedIds
* The primary key values (i.e. ids) for the associated child records to remove from the collection.
* Must be an array of numbers or strings; e.g. ['334724948aca33ea0f13', '913303583e0af031358bac931'] or [18, 19]
* If an empty array (`[]`) is specified, then this is a no-op.
*
* @qkey {Dictionary?} meta
* @qkey {String} using
* @qkey {String} method
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
module.exports = function removeFromCollection(/* targetRecordIds?, collectionAttrName?, associatedIds?, explicitCbMaybe?, meta? */) {
// Verify `this` refers to an actual Sails/Waterline model.
verifyModelMethodContext(this);
// Set up a few, common local vars for convenience / familiarity.
var WLModel = this;
var orm = this.waterline;
var modelIdentity = this.identity;
// Build an omen for potential use in the asynchronous callback below.
var omen = buildOmen(removeFromCollection);
// Build query w/ initial, universal keys.
var query = {
method: 'removeFromCollection',
using: modelIdentity
};
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// ╚═══╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚═╝╚═╝ ╚═╝╚═════╝ ╚═╝ ╚═════╝╚══════╝
//
// Handle the various supported usage possibilities
// (locate the `explicitCbMaybe` callback, and extend the `query` dictionary)
// The `explicitCbMaybe` callback, if one was provided.
var explicitCbMaybe;
// Handle the various supported usage possibilities
// (locate the `explicitCbMaybe` callback)
//
// > Note that we define `args` so that we can insulate access
// > to the arguments provided to this function.
var args = arguments;
(function _handleVariadicUsage(){
// The metadata container, if one was provided.
var _meta;
// Handle first two arguments:
// (both of which always have exactly one meaning)
//
// • removeFromCollection(targetRecordIds, collectionAttrName, ...)
query.targetRecordIds = args[0];
query.collectionAttrName = args[1];
// Handle double meaning of third argument, & then handle the rest:
//
// • removeFromCollection(____, ____, associatedIds, explicitCbMaybe, _meta)
var is3rdArgArray = !_.isUndefined(args[2]);
if (is3rdArgArray) {
query.associatedIds = args[2];
explicitCbMaybe = args[3];
_meta = args[4];
}
// • removeFromCollection(____, ____, explicitCbMaybe, _meta)
else {
explicitCbMaybe = args[2];
_meta = args[3];
}
// Fold in `_meta`, if relevant.
if (!_.isUndefined(_meta)) {
query.meta = _meta;
} // >-
})();
// ██████╗ ███████╗███████╗███████╗██████╗
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// ╚═════╝ ╚══════╝╚═╝ ╚══════╝╚═╝ ╚═╝
//
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// ╚═╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝ ╚═════╝ ╚══════╝╚═╝
//
// ┌┐ ┬ ┬┬┬ ┌┬┐ ┬ ┬─┐┌─┐┌┬┐┬ ┬┬─┐┌┐┌ ┌┐┌┌─┐┬ ┬ ┌┬┐┌─┐┌─┐┌─┐┬─┐┬─┐┌─┐┌┬┐
// ├┴┐│ │││ ││ ┌┼─ ├┬┘├┤ │ │ │├┬┘│││ │││├┤ │││ ││├┤ ├┤ ├┤ ├┬┘├┬┘├┤ ││
// └─┘└─┘┴┴─┘─┴┘ └┘ ┴└─└─┘ ┴ └─┘┴└─┘└┘ ┘└┘└─┘└┴┘ ─┴┘└─┘└ └─┘┴└─┴└─└─┘─┴┘
// ┌─ ┬┌─┐ ┬─┐┌─┐┬ ┌─┐┬ ┬┌─┐┌┐┌┌┬┐ ─┐
// │─── │├┤ ├┬┘├┤ │ ├┤ └┐┌┘├─┤│││ │ ───│
// └─ ┴└ ┴└─└─┘┴─┘└─┘ └┘ ┴ ┴┘└┘ ┴ ─┘
// If an explicit callback function was specified, then immediately run the logic below
// and trigger the explicit callback when the time comes. Otherwise, build and return
// a new Deferred now. (If/when the Deferred is executed, the logic below will run.)
return parley(
function (done){
// Otherwise, IWMIH, we know that it's time to actually do some stuff.
// So...
//
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// ╚══════╝╚═╝ ╚═╝╚══════╝ ╚═════╝ ╚═════╝ ╚═╝ ╚══════╝
// ╔═╗╔═╗╦═╗╔═╗╔═╗ ┌─┐┌┬┐┌─┐┌─┐┌─┐ ┌┬┐┬ ┬┌─┐ ┌─┐ ┬ ┬┌─┐┬─┐┬ ┬
// ╠╣ ║ ║╠╦╝║ ╦║╣ └─┐ │ ├─┤│ ┬├┤ │ ││││ │ │─┼┐│ │├┤ ├┬┘└┬┘
// ╚ ╚═╝╩╚═╚═╝╚═╝ └─┘ ┴ ┴ ┴└─┘└─┘ ┴ └┴┘└─┘ └─┘└└─┘└─┘┴└─ ┴
//
// Forge a stage 2 query (aka logical protostatement)
try {
forgeStageTwoQuery(query, orm);
} catch (e) {
switch (e.code) {
case 'E_INVALID_TARGET_RECORD_IDS':
return done(
flaverr({
name: 'UsageError',
code: e.code,
details: e.details,
message:
'The target record ids (i.e. first argument) passed to `.removeFromCollection()` '+
'should be the ID (or IDs) of target records whose collection will be modified.\n'+
'Details:\n'+
' ' + e.details + '\n'
}, omen)
);
case 'E_INVALID_COLLECTION_ATTR_NAME':
return done(
flaverr({
name: 'UsageError',
code: e.code,
details: e.details,
message:
'The collection attr name (i.e. second argument) to `.removeFromCollection()` should '+
'be the name of a collection association from this model.\n'+
'Details:\n'+
' ' + e.details + '\n'
}, omen)
);
case 'E_INVALID_ASSOCIATED_IDS':
return done(
flaverr({
name: 'UsageError',
code: e.code,
details: e.details,
message:
'The associated ids (i.e. using `.members()`, or the third argument) passed to `.removeFromCollection()` should be '+
'the ID (or IDs) of associated records to remove.\n'+
'Details:\n'+
' ' + e.details + '\n'
}, omen)
);
case 'E_NOOP':
return done();
// ^ tolerate no-ops -- i.e. empty array of target record ids or empty array of associated ids (members)
case 'E_INVALID_META':
return done(
flaverr({
name: 'UsageError',
code: e.code,
details: e.details,
message: e.message
}, omen)
);
// ^ when the standard usage error message is good enough as-is, without any further customization
default:
return done(e);
// ^ when an internal, miscellaneous, or unexpected error occurs
}
} // >-•
// ┌┐┌┌─┐┬ ┬ ╔═╗╔═╗╔╦╗╦ ╦╔═╗╦ ╦ ╦ ╦ ┌┬┐┌─┐┬ ┬┌─ ┌┬┐┌─┐ ┌┬┐┬ ┬┌─┐ ┌┬┐┌┐ ┌─┐
// ││││ ││││ ╠═╣║ ║ ║ ║╠═╣║ ║ ╚╦╝ │ ├─┤│ ├┴┐ │ │ │ │ ├─┤├┤ ││├┴┐└─┐
// ┘└┘└─┘└┴┘ ╩ ╩╚═╝ ╩ ╚═╝╩ ╩╩═╝╩═╝╩ ┴ ┴ ┴┴─┘┴ ┴ ┴ └─┘ ┴ ┴ ┴└─┘ ─┴┘└─┘└─┘
(function (proceed) {
// Get the model being used as the parent
var WLModel = orm.collections[query.using];
try { assert.equal(query.using.toLowerCase(), query.using, '`query.using` (identity) should have already been normalized before getting here! But it was not: '+query.using); } catch (e) { return proceed(e); }
// Look up the association by name in the schema definition.
var schemaDef = WLModel.schema[query.collectionAttrName];
// Look up the associated collection using the schema def which should have
// join tables normalized
var WLChild = orm.collections[schemaDef.collection];
try {
assert.equal(schemaDef.collection.toLowerCase(), schemaDef.collection, '`schemaDef.collection` (identity) should have already been normalized before getting here! But it was not: '+schemaDef.collection);
assert.equal(schemaDef.referenceIdentity.toLowerCase(), schemaDef.referenceIdentity, '`schemaDef.referenceIdentity` (identity) should have already been normalized before getting here! But it was not: '+schemaDef.referenceIdentity);
assert.equal(Object.getPrototypeOf(WLChild).identity.toLowerCase(), Object.getPrototypeOf(WLChild).identity, '`Object.getPrototypeOf(WLChild).identity` (identity) should have already been normalized before getting here! But it was not: '+Object.getPrototypeOf(WLChild).identity);
} catch (e) { return proceed(e); }
// Flag to determine if the WLChild is a manyToMany relation
var manyToMany = false;
// Check if the schema references something other than the WLChild
if (schemaDef.referenceIdentity !== Object.getPrototypeOf(WLChild).identity) {
manyToMany = true;
WLChild = orm.collections[schemaDef.referenceIdentity];
}
// Check if the child is a join table
if (_.has(Object.getPrototypeOf(WLChild), 'junctionTable') && WLChild.junctionTable) {
manyToMany = true;
}
// Check if the child is a through table
if (_.has(Object.getPrototypeOf(WLChild), 'throughTable') && _.keys(WLChild.throughTable).length) {
manyToMany = true;
}
// Ensure the query skips lifecycle callbacks
// Build a modified shallow clone of the originally-provided `meta`
var modifiedMeta = _.extend({}, query.meta || {}, { skipAllLifecycleCallbacks: true });
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// ╚██╗██║ ╚████║██╗██╗██║ ╚═╝ ██║██╔╝
// ╚═╝╚═╝ ╚═══╝╚═╝╚═╝╚═╝ ╚═╝╚═╝
//
// ███╗ ███╗ █████╗ ███╗ ██╗██╗ ██╗ ████████╗ ██████╗ ███╗ ███╗ █████╗ ███╗ ██╗██╗ ██╗
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// ██║ ╚═╝ ██║██║ ██║██║ ╚████║ ██║ ██║ ╚██████╔╝ ██║ ╚═╝ ██║██║ ██║██║ ╚████║ ██║
// ╚═╝ ╚═╝╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═╝ ╚═╝ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═╝
//
// If the collection uses a join table, build a query that removes the records
// from the table.
if (manyToMany) {
// ╔╗ ╦ ╦╦╦ ╔╦╗ ┬─┐┌─┐┌─┐┌─┐┬─┐┌─┐┌┐┌┌─┐┌─┐ ┌┬┐┌─┐┌─┐┌─┐┬┌┐┌┌─┐
// ╠╩╗║ ║║║ ║║ ├┬┘├┤ ├┤ ├┤ ├┬┘├┤ ││││ ├┤ │││├─┤├─┘├─┘│││││ ┬
// ╚═╝╚═╝╩╩═╝═╩╝ ┴└─└─┘└ └─┘┴└─└─┘┘└┘└─┘└─┘ ┴ ┴┴ ┴┴ ┴ ┴┘└┘└─┘
//
// Maps out the parent and child attribute names to use for the query.
var parentReference;
var childReference;
// Find the parent reference
if (_.has(Object.getPrototypeOf(WLChild), 'junctionTable') && WLChild.junctionTable) {
// Assumes the generated junction table will only ever have two foreign key
// values. Should be safe for now and any changes would need to be made in
// Waterline-Schema where a map could be formed anyway.
_.each(WLChild.schema, function(wlsAttrDef, key) {
if (!_.has(wlsAttrDef, 'references')) {
return;
}
// If this is the piece of the join table, set the parent reference.
if (_.has(wlsAttrDef, 'columnName') && wlsAttrDef.columnName === schemaDef.on) {
parentReference = key;
}
});
}
// If it's a through table, grab the parent and child reference from the
// through table mapping that was generated by Waterline-Schema.
else if (_.has(Object.getPrototypeOf(WLChild), 'throughTable')) {
childReference = WLChild.throughTable[WLModel.identity + '.' + query.collectionAttrName];
_.each(WLChild.throughTable, function(rhs, key) {
if (key !== WLModel.identity + '.' + query.collectionAttrName) {
parentReference = rhs;
}
});
}//>-
// Find the child reference in a junction table
if (_.has(Object.getPrototypeOf(WLChild), 'junctionTable') && WLChild.junctionTable) {
// Assumes the generated junction table will only ever have two foreign key
// values. Should be safe for now and any changes would need to be made in
// Waterline-Schema where a map could be formed anyway.
_.each(WLChild.schema, function(wlsAttrDef, key) {
if (!_.has(wlsAttrDef, 'references')) {
return;
}
// If this is the other piece of the join table, set the child reference.
if (_.has(wlsAttrDef, 'columnName') && wlsAttrDef.columnName !== schemaDef.on) {
childReference = key;
}
});//</_.each()>
}//>-
// ╔╗ ╦ ╦╦╦ ╔╦╗ ┌─┐ ┬ ┬┌─┐┬─┐┬ ┬
// ╠╩╗║ ║║║ ║║ │─┼┐│ │├┤ ├┬┘└┬┘
// ╚═╝╚═╝╩╩═╝═╩╝ └─┘└└─┘└─┘┴└─ ┴ (S)
//
// If only a single targetRecordId is used, this can be proceed in a single
// query. Otherwise multiple queries will be needed - one for each parent.
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// FUTURE: Combine this bit into one single query using something like:
// ```
// { or: [ { and: [{..},{..:{in:[..]}}] }, { and: [{..},{..:{in: [..]}}] }, ... ] }
// ```
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Build an array to hold `where` clauses for all records being removed.
// For each target record, build a constraint destroy query for the associated records.
var joinRecordWhereClauses = [];
_.each(query.targetRecordIds, function(targetId) {
var whereClauseForTarget = {};
whereClauseForTarget[parentReference] = targetId;
whereClauseForTarget[childReference] = { in: query.associatedIds };
joinRecordWhereClauses.push(whereClauseForTarget);
});
// ╦═╗╦ ╦╔╗╔ ┌─┐ ┬ ┬┌─┐┬─┐┬ ┬
// ╠╦╝║ ║║║║ │─┼┐│ │├┤ ├┬┘└┬┘
// ╩╚═╚═╝╝╚╝ └─┘└└─┘└─┘┴└─ ┴
async.each(joinRecordWhereClauses, function(whereClause, next) {
WLChild.destroy(whereClause, function(err){
if (err) { return next(err); }
return next();
}, modifiedMeta);
},// ~∞%°
function _after(err) {
if (err) { return proceed(err); }
return proceed();
});//</ async.each() >
return;
}//_∏_. </ if this is a n..m (many to many) association >
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// ╚═╝╚═╝ ╚═══╝╚═╝╚═╝╚═╝╚═╝
//
// ██████╗ ███████╗██╗ ██████╗ ███╗ ██╗ ██████╗ ███████╗ ████████╗ ██████╗
// ██╔══██╗██╔════╝██║ ██╔═══██╗████╗ ██║██╔════╝ ██╔════╝ ╚══██╔══╝██╔═══██╗
// ██████╔╝█████╗ ██║ ██║ ██║██╔██╗ ██║██║ ███╗███████╗ ██║ ██║ ██║
// ██╔══██╗██╔══╝ ██║ ██║ ██║██║╚██╗██║██║ ██║╚════██║ ██║ ██║ ██║
// ██████╔╝███████╗███████╗╚██████╔╝██║ ╚████║╚██████╔╝███████║ ██║ ╚██████╔╝
// ╚═════╝ ╚══════╝╚══════╝ ╚═════╝ ╚═╝ ╚═══╝ ╚═════╝ ╚══════╝ ╚═╝ ╚═════╝
//
// Otherwise, this association is exclusive-- so rather than deleting junction records, we'll need
// to update the child records themselves, nulling out their foreign key value (aka singular, "model", association).
// ╔╗ ╦ ╦╦╦ ╔╦╗ ┌─┐ ┬ ┬┌─┐┬─┐┬ ┬
// ╠╩╗║ ║║║ ║║ │─┼┐│ │├┤ ├┬┘└┬┘
// ╚═╝╚═╝╩╩═╝═╩╝ └─┘└└─┘└─┘┴└─ ┴
//
// Build up criteria that selects child records.
var criteria = { where: {} };
criteria.where[WLChild.primaryKey] = query.associatedIds;
criteria.where[schemaDef.via] = query.targetRecordIds;
// Build up the values to set (we'll null out the other side).
var valuesToUpdate = {};
valuesToUpdate[schemaDef.via] = null;
// ╦═╗╦ ╦╔╗╔ ┌─┐ ┬ ┬┌─┐┬─┐┬ ┬
// ╠╦╝║ ║║║║ │─┼┐│ │├┤ ├┬┘└┬┘
// ╩╚═╚═╝╝╚╝ └─┘└└─┘└─┘┴└─ ┴
WLChild.update(criteria, valuesToUpdate, function(err){
if (err) { return proceed(err); }
return proceed();
}, modifiedMeta);//</.update()>
})(function (err) {
if (err) { return done(err); }
// IWMIH, everything worked!
// > Note that we do not send back a result of any kind-- this it to reduce the likelihood
// > writing userland code that relies undocumented/experimental output.
return done();
});//</ self-calling function (actually talk to the dbs) >
},
explicitCbMaybe,
_.extend(DEFERRED_METHODS, {
// Provide access to this model for use in query modifier methods.
_WLModel: WLModel,
// Set up initial query metadata.
_wlQueryInfo: query,
})
);//</parley>
};