graphql-mocks/relay/apply-cursor-to-edges.js

Tools for setting up graphql test resolvers

'use strict';

function applyCursorsToEdges(edges, cursorForNode, before, after) {
  let frontCut = false;
  let backCut = false;
  if (after) {
    const afterEdge = edges.find(edge => cursorForNode(edge.node) === after);
    if (!afterEdge) throw new Error(`${after} doesn't appear to be a valid edge`);
    const afterEdgeIndex = edges.indexOf(afterEdge);
    const sliced = edges.slice(afterEdgeIndex + 1, edges.length);
    frontCut = sliced.length !== edges.length;
    edges = sliced;
  }
  if (before) {
    const beforeEdge = edges.find(edge => cursorForNode(edge.node) === before);
    if (!beforeEdge) throw new Error(`${before} doesn't appear to be a valid edge`);
    const beforeEdgeIndex = edges.indexOf(beforeEdge);
    const sliced = edges.slice(0, beforeEdgeIndex);
    backCut = sliced.length !== edges.length;
    edges = sliced;
  }
  return {
    edges,
    frontCut,
    backCut
  };
}
exports.applyCursorsToEdges = applyCursorsToEdges;
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