Object initialization, setting all the default values.
OptionalnewData: anythe data to load, optional
Optionaloptions: anycustom options to apply; they will depend on the child resource
Usually, there is no need to implement the constructor; implicitly, it will call the load of the child resource
and therefore loading all the resources with default values.
If needed, this is the suggested implementation:
super();
this.load(x);
// ...
The lastEvaluatedKeys for getting the next page of the pagination, for each resources.
The resources of which there is still data to acquire.
Return an attribute in a cleaned standard that force-cast the element.
the origin attribute, to cast
the cast function, e.g. Boolean, Number, String, x => new CustomClass(x), etc.
OptionaldefaultVal: anyif set, the fallback value instead of null
cleaned attribute
Return an array in a cleaned standard that force-cast each element, keeping only the valid ones.
the origin array, to cast and check
the cast function, e.g. x => String(x) or x => new CustomClass(x)
OptionaldefaultVal: anyif set, the fallback value instead of null
cleaned array
Shortcut to Utils.isEmpty to check the emptiness of a field.
Optionaltype: isEmptyFieldTypesLoad the attributes from an already existing resource and then force some attributes to assume safeData values. The function is usually used in the back-end to mix together db data with new data, without the risk of changing ids and other attributes which are managed in appositely curated scenario.
the data to load
the attributes to force to specific values
Optionaloptions: anycustom options to apply; they will depend on the child resource
Typical implementation:
super.safeLoad(newData, safeData);
this.keyAttr = safeData.keyAttr;
this.importantAttr = safeData.importantAttr;
this.isDraft = safeData.isDraft;
// ...
Note well: there is no need to call this.load(), since it's implicitly called from super.safeLoad(),
which will anyway use the child version of the method.
Valide the object's attributes, performing all the checkings.
Optionaloptions: anycustom options to apply; they will depend on the implementations
errors if empty, the checkings are successfully passed.
Typical implementation:
const e = super.validate();
if(this.iE(this.attr)) e.push(`attr`);
// ...
return e;
The structure to have the next page of a previous delta request.