objection-paginator/dist/mjs/cursor.js

Paginated queries for Objection.js

import { InvalidJsonError, decodeObject, encodeObject } from "@batterii/encode-object";
import _ from "lodash";
import { InvalidCursorError } from "./invalid-cursor-error.js";
import { is } from "nani";
export class Cursor {
    constructor(query, sort, values) {
        this.query = query;
        this.sort = sort;
        this.values = values;
    }
    static fromObject(obj) {
        return new Cursor(obj.q, obj.s, obj.v);
    }
    static validateObject(value) {
        if (!_.isObjectLike(value)) {
            throw new InvalidCursorError("Cursor is not object-like", { info: { cursor: value } });
        }
        if (!_.isString(value.q)) {
            throw new InvalidCursorError("Cursor 'q' is not a string", { info: { q: value.q } });
        }
        if (!_.isString(value.s)) {
            throw new InvalidCursorError("Cursor 's' is not a string", { info: { s: value.s } });
        }
        if (value.v !== undefined && !_.isArray(value.v)) {
            throw new InvalidCursorError("Cursor 'v' is not an array", { info: { v: value.v } });
        }
        return value;
    }
    static parse(str) {
        let obj;
        try {
            obj = decodeObject(str);
        }
        catch (err) {
            if (!is(err, InvalidJsonError))
                throw err;
            throw new InvalidCursorError({
                shortMessage: "Cursor contains invalid JSON",
                cause: err,
                info: { cursor: str },
            });
        }
        return Cursor.fromObject(Cursor.validateObject(obj));
    }
    toObject() {
        const obj = { q: this.query, s: this.sort };
        if (this.values)
            obj.v = this.values;
        return obj;
    }
    serialize() {
        return encodeObject(this.toObject());
    }
}
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