@decaf-ts/for-couchdb
Version:
template for ts projects
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JavaScript
import { Paginator, PagingError, Sequence } from "@decaf-ts/core";
import { findPrimaryKey, InternalError } from "@decaf-ts/db-decorators";
import { CouchDBKeys } from "./../constants.js";
/**
* @description Paginator for CouchDB query results
* @summary Implements pagination for CouchDB queries using bookmarks for efficient navigation through result sets
* @template M - The model type that extends Model
* @template R - The result type
* @param {CouchDBAdapter<any, any, any>} adapter - The CouchDB adapter
* @param {MangoQuery} query - The Mango query to paginate
* @param {number} size - The page size
* @param {Constructor<M>} clazz - The model constructor
* @class CouchDBPaginator
* @example
* // Example of using CouchDBPaginator
* const adapter = new MyCouchDBAdapter(scope);
* const query = { selector: { type: "user" } };
* const paginator = new CouchDBPaginator(adapter, query, 10, User);
*
* // Get the first page
* const page1 = await paginator.page(1);
*
* // Get the next page
* const page2 = await paginator.page(2);
*/
export class CouchDBPaginator extends Paginator {
/**
* @description Gets the total number of pages
* @summary Not supported in CouchDB - throws an error when accessed
* @return {number} Never returns as it throws an error
* @throws {InternalError} Always throws as this functionality is not available in CouchDB
*/
get total() {
throw new InternalError(`The total pages api is not available for couchdb`);
}
/**
* @description Gets the total record count
* @summary Not supported in CouchDB - throws an error when accessed
* @return {number} Never returns as it throws an error
* @throws {InternalError} Always throws as this functionality is not available in CouchDB
*/
get count() {
throw new InternalError(`The record count api is not available for couchdb`);
}
/**
* @description Creates a new CouchDBPaginator instance
* @summary Initializes a paginator for CouchDB query results
* @param {CouchDBAdapter<any, any, any>} adapter - The CouchDB adapter
* @param {MangoQuery} query - The Mango query to paginate
* @param {number} size - The page size
* @param {Constructor<M>} clazz - The model constructor
*/
constructor(adapter, query, size, clazz) {
super(adapter, query, size, clazz);
}
/**
* @description Prepares a query for pagination
* @summary Modifies the raw query to include pagination parameters
* @param {MangoQuery} rawStatement - The original Mango query
* @return {MangoQuery} The prepared query with pagination parameters
*/
prepare(rawStatement) {
const query = Object.assign({}, rawStatement);
if (query.limit)
this.limit = query.limit;
query.limit = this.size;
return query;
}
/**
* @description Retrieves a specific page of results
* @summary Executes the query with pagination and processes the results
* @param {number} [page=1] - The page number to retrieve
* @return {Promise<R[]>} A promise that resolves to an array of results
* @throws {PagingError} If trying to access a page other than the first without a bookmark, or if no class is defined
* @mermaid
* sequenceDiagram
* participant Client
* participant CouchDBPaginator
* participant Adapter
* participant CouchDB
*
* Client->>CouchDBPaginator: page(pageNumber)
* Note over CouchDBPaginator: Clone statement
* CouchDBPaginator->>CouchDBPaginator: validatePage(page)
*
* alt page !== 1
* CouchDBPaginator->>CouchDBPaginator: Check bookmark
* alt No bookmark
* CouchDBPaginator-->>Client: Throw PagingError
* else Has bookmark
* CouchDBPaginator->>CouchDBPaginator: Add bookmark to statement
* end
* end
*
* CouchDBPaginator->>Adapter: raw(statement, false)
* Adapter->>CouchDB: Execute query
* CouchDB-->>Adapter: Return results
* Adapter-->>CouchDBPaginator: Return MangoResponse
*
* Note over CouchDBPaginator: Process results
*
* alt Has warning
* CouchDBPaginator->>CouchDBPaginator: Log warning
* end
*
* CouchDBPaginator->>CouchDBPaginator: Check for clazz
*
* alt No clazz
* CouchDBPaginator-->>Client: Throw PagingError
* else Has clazz
* CouchDBPaginator->>CouchDBPaginator: Find primary key
*
* alt Has fields in statement
* CouchDBPaginator->>CouchDBPaginator: Use docs directly
* else No fields
* CouchDBPaginator->>CouchDBPaginator: Process each document
* loop For each document
* CouchDBPaginator->>CouchDBPaginator: Extract original ID
* CouchDBPaginator->>Adapter: revert(doc, clazz, pkDef.id, parsedId)
* end
* end
*
* CouchDBPaginator->>CouchDBPaginator: Store bookmark
* CouchDBPaginator->>CouchDBPaginator: Update currentPage
* CouchDBPaginator-->>Client: Return results
* end
*/
async page(page = 1) {
const statement = Object.assign({}, this.statement);
if (!this._recordCount || !this._totalPages) {
this._totalPages = this._recordCount = 0;
const results = await this.adapter.raw({ ...statement, limit: undefined }) || [];
this._recordCount = results.length;
if (this._recordCount > 0) {
const size = statement?.limit || this.size;
this._totalPages = Math.ceil(this._recordCount / size);
}
}
this.validatePage(page);
if (page !== 1) {
if (!this.bookMark)
throw new PagingError("No bookmark. Did you start in the first page?");
statement["bookmark"] = this.bookMark;
}
const rawResult = await this.adapter.raw(statement, false);
const { docs, bookmark, warning } = rawResult;
if (warning)
console.warn(warning);
if (!this.clazz)
throw new PagingError("No statement target defined");
const pkDef = findPrimaryKey(new this.clazz());
const results = statement.fields && statement.fields.length
? docs // has fields means its not full model
: docs.map((d) => {
//no fields means we need to revert to saving process
const originalId = d._id.split(CouchDBKeys.SEPARATOR);
originalId.splice(0, 1); // remove the table name
return this.adapter.revert(d, this.clazz, pkDef.id, Sequence.parseValue(pkDef.props.type, originalId.join(CouchDBKeys.SEPARATOR)));
});
this.bookMark = bookmark;
this._currentPage = page;
return results;
}
}
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The model type that extends Model\n * @template R - The result type\n * @param {CouchDBAdapter<any, any, any>} adapter - The CouchDB adapter\n * @param {MangoQuery} query - The Mango query to paginate\n * @param {number} size - The page size\n * @param {Constructor<M>} clazz - The model constructor\n * @class CouchDBPaginator\n * @example\n * // Example of using CouchDBPaginator\n * const adapter = new MyCouchDBAdapter(scope);\n * const query = { selector: { type: \"user\" } };\n * const paginator = new CouchDBPaginator(adapter, query, 10, User);\n *\n * // Get the first page\n * const page1 = await paginator.page(1);\n *\n * // Get the next page\n * const page2 = await paginator.page(2);\n */\nexport class CouchDBPaginator<M extends Model, R> extends Paginator<\n  M,\n  R,\n  MangoQuery\n> {\n  /**\n   * @description Bookmark for CouchDB pagination\n   * @summary Stores the bookmark returned by CouchDB for continuing pagination\n   */\n  private bookMark?: string;\n\n  /**\n   * @description Gets the total number of pages\n   * @summary Not supported in CouchDB - throws an error when accessed\n   * @return {number} Never returns as it throws an error\n   * @throws {InternalError} Always throws as this functionality is not available in CouchDB\n   */\n  override get total(): number {\n    throw new InternalError(`The total pages api is not available for couchdb`);\n  }\n\n  /**\n   * @description Gets the total record count\n   * @summary Not supported in CouchDB - throws an error when accessed\n   * @return {number} Never returns as it throws an error\n   * @throws {InternalError} Always throws as this functionality is not available in CouchDB\n   */\n  override get count(): number {\n    throw new InternalError(\n      `The record count api is not available for couchdb`\n    );\n  }\n\n  /**\n   * @description Creates a new CouchDBPaginator instance\n   * @summary Initializes a paginator for CouchDB query results\n   * @param {CouchDBAdapter<any, any, any>} adapter - The CouchDB adapter\n   * @param {MangoQuery} query - The Mango query to paginate\n   * @param {number} size - The page size\n   * @param {Constructor<M>} clazz - The model constructor\n   */\n  constructor(\n    adapter: CouchDBAdapter<any, any, any>,\n    query: MangoQuery,\n    size: number,\n    clazz: Constructor<M>\n  ) {\n    super(adapter, query, size, clazz);\n  }\n\n  /**\n   * @description Prepares a query for pagination\n   * @summary Modifies the raw query to include pagination parameters\n   * @param {MangoQuery} rawStatement - The original Mango query\n   * @return {MangoQuery} The prepared query with pagination parameters\n   */\n  protected prepare(rawStatement: MangoQuery): MangoQuery {\n    const query: MangoQuery = Object.assign({}, rawStatement);\n    if (query.limit) this.limit = query.limit;\n\n    query.limit = this.size;\n\n    return query;\n  }\n\n  /**\n   * @description Retrieves a specific page of results\n   * @summary Executes the query with pagination and processes the results\n   * @param {number} [page=1] - The page number to retrieve\n   * @return {Promise<R[]>} A promise that resolves to an array of results\n   * @throws {PagingError} If trying to access a page other than the first without a bookmark, or if no class is defined\n   * @mermaid\n   * sequenceDiagram\n   *   participant Client\n   *   participant CouchDBPaginator\n   *   participant Adapter\n   *   participant CouchDB\n   *\n   *   Client->>CouchDBPaginator: page(pageNumber)\n   *   Note over CouchDBPaginator: Clone statement\n   *   CouchDBPaginator->>CouchDBPaginator: validatePage(page)\n   *\n   *   alt page !== 1\n   *     CouchDBPaginator->>CouchDBPaginator: Check bookmark\n   *     alt No bookmark\n   *       CouchDBPaginator-->>Client: Throw PagingError\n   *     else Has bookmark\n   *       CouchDBPaginator->>CouchDBPaginator: Add bookmark to statement\n   *     end\n   *   end\n   *\n   *   CouchDBPaginator->>Adapter: raw(statement, false)\n   *   Adapter->>CouchDB: Execute query\n   *   CouchDB-->>Adapter: Return results\n   *   Adapter-->>CouchDBPaginator: Return MangoResponse\n   *\n   *   Note over CouchDBPaginator: Process results\n   *\n   *   alt Has warning\n   *     CouchDBPaginator->>CouchDBPaginator: Log warning\n   *   end\n   *\n   *   CouchDBPaginator->>CouchDBPaginator: Check for clazz\n   *\n   *   alt No clazz\n   *     CouchDBPaginator-->>Client: Throw PagingError\n   *   else Has clazz\n   *     CouchDBPaginator->>CouchDBPaginator: Find primary key\n   *\n   *     alt Has fields in statement\n   *       CouchDBPaginator->>CouchDBPaginator: Use docs directly\n   *     else No fields\n   *       CouchDBPaginator->>CouchDBPaginator: Process each document\n   *       loop For each document\n   *         CouchDBPaginator->>CouchDBPaginator: Extract original ID\n   *         CouchDBPaginator->>Adapter: revert(doc, clazz, pkDef.id, parsedId)\n   *       end\n   *     end\n   *\n   *     CouchDBPaginator->>CouchDBPaginator: Store bookmark\n   *     CouchDBPaginator->>CouchDBPaginator: Update currentPage\n   *     CouchDBPaginator-->>Client: Return results\n   *   end\n   */\n  async page(page: number = 1): Promise<R[]> {\n    const statement = Object.assign({}, this.statement);\n\n   if (!this._recordCount || !this._totalPages) {\n        this._totalPages = this._recordCount = 0;\n        const results: R[] = await this.adapter.raw({ ...statement, limit: undefined }) || [];\n        this._recordCount = results.length;\n        if (this._recordCount > 0) {\n            const size = statement?.limit || this.size;\n            this._totalPages = Math.ceil(this._recordCount / size);\n        }\n    }\n\n    this.validatePage(page);\n\n    if (page !== 1) {\n      if (!this.bookMark)\n        throw new PagingError(\"No bookmark. Did you start in the first page?\");\n      statement[\"bookmark\"] = this.bookMark;\n    }\n    const rawResult: MangoResponse<any> = await this.adapter.raw(\n      statement,\n      false\n    );\n\n    const { docs, bookmark, warning } = rawResult;\n    if (warning) console.warn(warning);\n    if (!this.clazz) throw new PagingError(\"No statement target defined\");\n    const pkDef = findPrimaryKey(new this.clazz());\n    const results =\n      statement.fields && statement.fields.length\n        ? docs // has fields means its not full model\n        : docs.map((d: any) => {\n            //no fields means we need to revert to saving process\n            const originalId = d._id.split(CouchDBKeys.SEPARATOR);\n            originalId.splice(0, 1); // remove the table name\n            return this.adapter.revert(\n              d,\n              this.clazz,\n              pkDef.id,\n              Sequence.parseValue(\n                pkDef.props.type,\n                originalId.join(CouchDBKeys.SEPARATOR)\n              )\n            );\n          });\n    this.bookMark = bookmark;\n    this._currentPage = page;\n    return results;\n  }\n}\n"]}