QuerySpec : query by child objects (OneToMany)

I’ve got a @JsonApiFindAll endpoint on a findAll(QuerySpec requestParams) method which is working great for most of my needs, generally the object I am querying has single fields that I am searching on using EQ, LIKE, GT, and LT.

However, I want to query the object based on a collection of child entities and no matter what i try cannot get it to work.

Given I have entities like:

@Entity
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonApiResource(type = "people")
class Person {
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonApiId
    private Long id;

    private String firstname;
    private String lastname;
    private String email;
}

@Entity
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonApiResource(type = "article")
class Article {
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonApiId
    private Long id;

    @ManyToOne @JoinColumn(name = "personId")
    @JsonApiToOne @JsonApiIncludeByDefault
    private Person author;

    @OneToMany(mappedBy = "article", fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JsonApiToMany
    private Set<Comment> comments;

    private String content;
}

@Entity
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonApiResource(type = "comment")
class Comment {
    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    @JsonApiId
    private Long id;

    @ManyToOne @JoinColumn(name = "personId")
    @JsonApiToOne @JsonApiIncludeByDefault
    private Person author;

    private String content;
}

I want to query the articles that have comments by a particular users.

On the client side I’m using Ember which uses JsonAPI but I’ve not been able to get it to call a URL in the format that Katharsis wants.

Some examples of the URLs I’ve been trying (the ‘CONTAINS’ is a custom FilterOperator):

• articles?filter[comments][0][author][id]=85&filter[comments][1][author][id]=1310
• articles?filter[comments][0][person][id]=85&filter[comments][1][person][id]=1310
• articles?filter[comments][0][author][id]=85&filter[comments][1][author][id]=1310&include[articles]=comments.author
• articles?filter[comments][CONTAINS][0][person][id]=85&filter[comments][CONTAINS][1][person][id]=112
• articles?filter[comments][]=224&filter[comments][]=66

no matter what I try I keep getting io.katharsis.utils.parser.ParserException: Cannot parse to java.util.Set

[SingingBush]

I wasn’t actually choosing to put the comments index in there so it’s a red herring. It was just the way Ember.js was generating the query URL when I call their query function with filters, see ember docs. Probably just because I was only specifying 2 author id’s.

Essentially I would want any articles that have comments that are authored by user 85 or 1310. I suspect a URL format of articles?filter[comments][CONTAINS][author][id]=85,1310 or articles?filter[comments][author][id][IN]=85,1310 would make sense, not sure how tricky it would be to implement though.

[Ramblurr]

I agree in theory with that statement @masterspambot , but what @SingingBush is proposing isn’t supported by ember at all, specifically this:

articles?filter[comments][CONTAINS][author][id]=85,1310