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data.js
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data.js
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function flattenObject (obj) {
var result = {};
for (var key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (typeof obj[key] === 'object' && !(obj[key] instanceof Array)) {
var flat = flattenObject(obj[key]);
for (var x in flat) {
if (!flat.hasOwnProperty(x)) {
continue;
}
result[key + '.' + x] = flat[x];
}
} else {
result[key] = obj[key];
}
}
return result;
};
function unflattenObject (flat) {
var result = {};
var parentObj = result;
var keys = Object.keys(flat);
for (var i = 0; i < keys.length; ++i) {
var key = keys[i];
var subkeys = key.split('.');
var last = subkeys.pop();
for (var ii = 0; ii < subkeys.length; ++ii) {
var subkey = subkeys[ii];
parentObj[subkey] = typeof parentObj[subkey] === 'undefined' ? {} : parentObj[subkey];
parentObj = parentObj[subkey];
}
parentObj[last] = flat[key];
parentObj = result;
}
return result;
}
function prepareData (data) {
var self = this;
// wait for html
if (self.template.options && self.template.options.html && !self.formCache[self.template._id]) {
self.once('formRendered', function () {
self.data = flattenObject(data);
self.emit('dataSet', self.data, self.template._id);
});
return;
}
self.data = flattenObject(data);
self.emit('dataSet', self.data, self.template._id);
}
function setData (data, query) {
var self = this;
if (!self.template) {
return;
}
// check if data has template
if (typeof data !== 'object' || self.findBusy) {
return;
}
// don't fetch data from server when query is false
if (query === false) {
prepareData.call(self, data);
return;
}
self.findBusy = true;
var crud = {
t: self.template._id,
q: query || {_id: data._id},
o: {limit: 1},
// TODO remove this when updates on linked fields are possible
noJoins: true
};
self.emit('find', crud, function (err, resultData) {
self.findBusy = false;
// TODO handle error
if (err) {
return;
}
prepareData.call(self, resultData[0] || data);
});
}
function setField (field, value) {
var self = this;
if (!self.data || !self.template) {
return;
}
// check if field in tempalte exitst
if (self.template.schema[field]) {
self.data[field] = value;
self.emit('dataChanged');
}
self.emit('fieldSet');
}
// adds $set and $unset if the field is enabled or disabled
function buildUpdateObject (data) {
var self = this;
var obj = {
$set: {},
$unset: {}
}
var fields = self.formCache[self.template._id].refs;
for (var field in fields) {
if (!fields.hasOwnProperty(field)) continue;
if (!fields[field].disabled && data.hasOwnProperty(field)) {
obj['$set'][field] = data[field];
} else if (fields[field].disabled) {
obj['$unset'][field] = '1';
}
}
// empty $set or $unset object are invalid in a mongo update document
for (var key in obj) {
if (!Object.keys(obj[key]).length) {
delete obj[key];
}
}
return obj;
}
function save (callback) {
var self = this;
callback = callback || function () {};
// if no data is set, no data can be saved
if (!self.data || !self.template) {
return;
}
// create crud request
var crud = {
t: self.template._id,
d: self.send
};
// upsert if item already exists
if (self.data._id) {
crud.q = {_id: self.data._id};
delete crud.d._id;
crud.d = buildUpdateObject.call(self, crud.d);
}
// do an insert if no query
var isInsert = !crud.q;
if (isInsert) {
crud.d = unflattenObject(crud.d);
}
// do request with the crud module
self.emit(isInsert ? 'insert' : 'update', crud, function (err, data) {
// for insert queries
if (isInsert) {
if (err || !data || !data.length) {
callback("No self.data or self.template set.");
self.emit('saved', err || 'Missing insert result');
return;
}
self.data = flattenObject(data[0]);
callback(null, self.data);
self.emit('saved', null, self.data, true);
self.emit('dataSet', self.data, self.template._id);
return;
}
// for update queries
if (err) {
callback("Update error: " + err);
self.emit('saved', err);
return;
}
self.once('dataSet', function () {
if (!self.config.options.callGetItem) {
callback(null, self.data);
self.emit('saved', null, self.data);
return;
}
self.emit('getItem', self.data, function (err, dataItem) {
callback(err, dataItem);
self.emit('saved', err, dataItem);
});
});
// update queries require a form refresh
self.emit('setData', {_id: self.data._id});
});
}
function remove () {
var self = this;
// if not data is set, no data can be removed
if (!self.data || !self.data._id || self.template) {
return;
}
// create crud object
var crud = {
t: self.template._id,
q: {_id: self.data._id}
};
// do request with the crud module
self.emit('remove', crud, function (err, result) {
// reset form data
if (!err && result) {
self.data = {};
}
// emit remove operation complete
self.emit('removed', err, result);
});
}
function init () {
var self = this;
// init data events when a template is set
self.once('templateSet', function () {
self.on('setData', setData);
self.on('setField', setField);
self.on('saveCrud', save);
self.on('rm', remove);
});
}
module.exports = init;