open-learning-exchange/planet

// Creates a Mango query to find one document with search based on one field
export function findOneDocument(selector, query) {
  return Object.assign(findAllDocuments(selector, query), { limit: 1 });
}

// Creates a Mango query to find all documents with search based on one field
export function findAllDocuments(selector, query) {
  return JSON.parse(`
    {
      "selector": {
        "${selector}": "${query}"
      },
      "fields": ["${selector}"]
    }
  `);
}

// Creates more general find query that can search with multiple selectors & fields
export function findDocuments(selectors, fields: any = 0, sort: any = 0, limit = 1000, skip = 0) {
  const queries = { 'selector': selectors, 'skip': skip };
  if (fields) { queries['fields'] = fields; }
  if (limit) { queries['limit'] = limit; }
  if (sort !== 0) { queries['sort'] = sort; }
  return queries;
}

// Returns a selector to get all docs with a field matching one of the array or all docs if array is empty
export function inSelector(array = []) {
  return array.length > 0 ? { '$in': array } : { '$gt': null };
}