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Projections #1310

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merged 16 commits into from
Mar 17, 2016
Merged

Projections #1310

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02e11d9
add initial support for a .select method
particlebanana Feb 19, 2016
f4961ab
allow select to be used in populated criteria
particlebanana Feb 19, 2016
4e74f4d
remove comment block
particlebanana Feb 19, 2016
1733a11
allow select to be called more than once
particlebanana Feb 20, 2016
5ddc424
ignore virtual attributes in select
particlebanana Mar 16, 2016
b1015b8
fix concat function
particlebanana Mar 16, 2016
3c71edf
only select the foreign key if it's available
particlebanana Mar 16, 2016
fa264ca
normalize select in criteria
particlebanana Mar 16, 2016
8088e9f
ensure the PK of the child record is always selected properly
particlebanana Mar 17, 2016
3386bde
move childPK selection up so it's always performed
particlebanana Mar 17, 2016
0da47d3
ensure selects are copied to the criteria in a m:m join
particlebanana Mar 17, 2016
66cd4f2
cleanup error
particlebanana Mar 17, 2016
4cdd74b
ensure the primary key is always being selected in the finders
particlebanana Mar 17, 2016
35a813e
update how operation criteria is built so that selects are preserved
particlebanana Mar 17, 2016
4789d11
fix for alter strategies
particlebanana Mar 17, 2016
46cc73f
fix unit tests
particlebanana Mar 17, 2016
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92 changes: 55 additions & 37 deletions lib/waterline/query/deferred.js
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,7 @@ Deferred.prototype.populate = function(keyName, criteria) {
});
return this;
}

// Normalize sub-criteria
try {
criteria = normalize.criteria(criteria);
Expand Down Expand Up @@ -149,32 +149,6 @@ Deferred.prototype.populate = function(keyName, criteria) {
);
}

//////////////////////////////////////////////////////////////////////
// (there has been significant progress made towards both of these ///
// goals-- contact @mikermcneil if you want to help) /////////////////
//////////////////////////////////////////////////////////////////////
// TODO:
// Create synonym for `.populate()` syntax using criteria object
// syntax. i.e. instead of using `joins` key in criteria object
// at the app level.
//////////////////////////////////////////////////////////////////////
// TODO:
// Support Mongoose-style `foo.bar.baz` syntax for nested `populate`s.
// (or something comparable.)
// One solution would be:
// .populate({
// friends: {
// where: { name: 'mike' },
// populate: {
// dentist: {
// where: { name: 'rob' }
// }
// }
// }
// }, optionalCriteria )
////////////////////////////////////////////////////////////////////


// 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.
Expand All @@ -187,7 +161,6 @@ Deferred.prototype.populate = function(keyName, criteria) {
parentKey: attr.columnName || pk,
child: attr.references,
childKey: attr.on,
select: Object.keys(this._context.waterline.schema[attr.references].attributes),
alias: keyName,
removeParentKey: !!parentKey.model,
model: !!hasOwnProperty(parentKey, 'model'),
Expand All @@ -196,16 +169,26 @@ Deferred.prototype.populate = function(keyName, criteria) {

// Build select object to use in the integrator
var select = [];
Object.keys(this._context.waterline.schema[attr.references].attributes).forEach(function(key) {
var obj = self._context.waterline.schema[attr.references].attributes[key];
if (!hasOwnProperty(obj, 'columnName')) {
var customSelect = criteria.select && _.isArray(criteria.select);
_.each(this._context.waterline.schema[attr.references].attributes, function(val, key) {
// Check if the user has defined a custom select and if so normalize it
if(customSelect && !_.includes(criteria.select, key)) {
return;
}

if (!_.has(val, 'columnName')) {
select.push(key);
return;
}

select.push(obj.columnName);
select.push(val.columnName);
});

// Ensure the PK and FK are always selected - otherwise things like the
// integrator won't work correctly
select.push(pk);
select.push(attr.on);

join.select = select;

var schema = this._context.waterline.schema[attr.references];
Expand All @@ -226,13 +209,32 @@ Deferred.prototype.populate = function(keyName, criteria) {

// If a junction table is used add an additional join to get the data
if (reference && hasOwnProperty(attr, 'on')) {
// Build out the second join object that will link a junction table with the
// values being populated
var selects = _.map(_.keys(this._context.waterline.schema[reference.references].attributes), function(attr) {
var expandedAttr = self._context.waterline.schema[reference.references].attributes[attr];
return expandedAttr.columnName || attr;
var selects = [];
_.each(this._context.waterline.schema[reference.references].attributes, function(val, key) {
// Check if the user has defined a custom select and if so normalize it
if(customSelect && !_.includes(criteria.select, key)) {
return;
}

if (!_.has(val, 'columnName')) {
selects.push(key);
return;
}

selects.push(val.columnName);
});

// Ensure the PK and FK are always selected - otherwise things like the
// integrator won't work correctly
var childPk;
_.each(this._context.waterline.schema[reference.references].attributes, function(val, key) {
if(_.has(val, 'primaryKey') && val.primaryKey) {
childPk = val.columnName || key;
}
});

selects.push(childPk);

join = {
parent: attr.references,
parentKey: reference.columnName,
Expand Down Expand Up @@ -270,6 +272,22 @@ Deferred.prototype.populate = function(keyName, criteria) {
}
};

/**
* Add projections to the parent
*
* @param {Array} attributes to select
* @return this
*/

Deferred.prototype.select = function(attributes) {
if(!_.isArray(attributes)) {
attributes = [attributes];
}

this._criteria.select = attributes;
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It should append to existing select and not replace it. Will allow to call select twice.

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I mean, what do you think?

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Ah good call!

return this;
};

/**
* Add a Where clause to the criteria object
*
Expand Down