mapping.Mapper with multiple models results in an error

[Yarden Bar]

Hi all,

Trying to configure a Mapper with multiple models:

 this.mapper = new mapping.Mapper(clientInstance, {
 models: {
 ModelA: {
 keyspace: config.get<string>("storage.config.keyspace"),
 mappings: new mapping.UnderscoreCqlToCamelCaseMappings(),
 tables: ["model_a_table"],
 },
 ModelB: {
 keyspace: config.get<string>("storage.config.keyspace"),
 mappings: new mapping.UnderscoreCqlToCamelCaseMappings(),
 tables: ["model_b_table"],
 },
 }
 });
 this.modelAMapper = this.mapper.forModel("ModelA");
 this.modelBMapper = this.mapper.forModel("ModelB");

This results in the following error:

Error: You must set the Client keyspace or specify the keyspace of the model in the MappingOptions

Same configuration with only ONE model definition, works.

Trying to configure multiple mappers separately for each model, results in the same error.

Appreciate any help.

Yarden

[Jorge Bay Gondra]

Hi,

Have you tried with the keyspace set when you connect the client instance?

For example:

client = new Client({ contactPoints, localDataCenter, keyspace });

On the other hand, it looks like you are configuring a Mapper using a field ModelA and then you want to retrieve the model mapper using "ModelA" string.

Have you tried using the same field for both?

modelAMapper = this.mapper.forModel(ModelA);

Hope it helps,

Jorge

[Yarden Bar]

Hello Jorge,

Yes, I have tried configuring the Client with the Keyspace, same error.

In Typescript, you can configure Object keys as literals and it will work the same as strings.

I did try using "ModelA" and "ModelB" as keys for the ModelConfig, but it results in the same error.

Did you try re-producing this ?

Thank you,

Jordan

[Yarden Bar]

Checked the Datastax-OSS JIRA for related issues, didn't find any

https://datastax-oss.atlassian.net/projects/NODEJS/issues/NODEJS-456?filter=allissues&orderby=priority%20DESC&keyword=mapper

[Jorge Bay Gondra]

Hi,

The Mapper has a good coverage in both integration and unit tests with complex models. The error is hinting that it can't find the mapping information for a model with that name: https://github.com/datastax/nodejs-driver/blob/06eee78ce3d625fc634fc4b8831ae4a251ea80f4/lib/mapping/mapper.js#L93-L97

With that information, my guess is that it's due to some kind of typo or incorrect setting. Can you check setting the keyspace and include one model at a time and then continue troubleshooting from there?

Otherwise, if you provide a small source code sample (without external dependencies like config) I can try it out.

Thanks,

Jorge

[Yarden Bar]

You're right, typo :(

I re-wrote this block and now it works.

Happy its just that :)

Thank you.

[Jorge Bay Gondra]

Glad to hear that you found the issue.

tbh, the error message is not very clear. I think logging messages can help (there is a ticket for that) but I've also filed a ticket for more clear error messages: https://datastax-oss.atlassian.net/browse/NODEJS-607

Thanks!