Loopback 4: Defining property in model as array

Question

I have a user model with a property addresses:

@property.array(Address)
addresses: Array<Address>;

But I get an error:

Cannot start the application. Error: "items" property must be present if "type" is an array

According to Loopback documentation, I do not need to do anything else.

Any idea what is missing?

score 4 · Answer 1 · answered Mar 29 '19 at 08:23

4

We usually don't declare arrays with Array type. The below code works for us. Try it out.

@property.array(Address)
addresses?: Address[];

answered Mar 29 '19 at 08:23

Samarpan

913
5
12

@eduardo, if this answer worked for you, can you please accept this answer ? – Samarpan Apr 01 '19 at 11:20
this has stopped working now after I updated the codebase to latest published versions of LB4 – Peter Andreas Moelgaard Jul 04 '20 at 07:35

score 2 · Answer 2 · answered Jul 27 '20 at 17:57

2

Loopback 4 (lb4)-

I had a requirement of creating a model property which would be an array of array. I tried to generate this property using lb4 CLI but I was not prompted for an array item type so I chose any.

The generated code was something like this-

@property({
  type: 'array',
  itemType: 'any'
})
extraInfo?: any[];

answered Jul 27 '20 at 17:57

Varun Kumar

2,543
1
23
22

1

using "itemType" worked for me with Loopback v4.0.7 – Peter Andreas Moelgaard Feb 03 '23 at 18:52

Loopback 4: Defining property in model as array

2 Answers2