nestjs-graphql-relay/lib/index.js

@nestjs/graphql + graphql-relay + typeorm

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ConnectionArgs = void 0;
exports.getPagingParameters = getPagingParameters;
exports.findAndPaginate = findAndPaginate;
const tslib_1 = require("tslib");
const Relay = tslib_1.__importStar(require("graphql-relay"));
const connectionArgs_1 = require("./connectionArgs");
Object.defineProperty(exports, "ConnectionArgs", { enumerable: true, get: function () { return connectionArgs_1.ConnectionArgs; } });
tslib_1.__exportStar(require("./orderBy.input"), exports);
tslib_1.__exportStar(require("./pageInfo"), exports);
function getMeta({ first = 0, last = 0, after, before, }) {
    const isForwardPaging = !!first || !!after;
    const isBackwardPaging = !!last || !!before;
    return isForwardPaging
        ? { pagingType: "forward", after, first }
        : isBackwardPaging
            ? { pagingType: "backward", before, last }
            : { pagingType: "none" };
}
function getPagingParameters(args) {
    const meta = getMeta(args);
    switch (meta.pagingType) {
        case "forward": {
            let offset = 0;
            if (meta.after) {
                offset = Relay.cursorToOffset(meta.after) + 1;
            }
            if (Number.isNaN(offset)) {
                throw new Error("invalid before query");
            }
            return {
                limit: meta.first,
                offset,
            };
        }
        case "backward": {
            const { last, before } = meta;
            let limit = last;
            let offset = Relay.cursorToOffset(before || "") - last;
            if (Number.isNaN(offset)) {
                throw new Error("invalid before query");
            }
            if (offset < 0) {
                limit = Math.max(last + offset, 0);
                offset = 0;
            }
            return { offset, limit };
        }
        default:
            return {};
    }
}
async function findAndPaginate(condition, connArgs, repository) {
    const { limit, offset } = getPagingParameters(connArgs);
    const [entities, count] = await repository.findAndCount({
        ...condition,
        skip: offset,
        take: limit,
    });
    return Relay.connectionFromArraySlice(entities, connArgs, {
        arrayLength: count,
        sliceStart: offset || 0,
    });
}
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