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@decaf-ts/for-postgres

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.PostgresPaginator = void 0; const core_1 = require("@decaf-ts/core"); /** * @description Paginator for PostgreSQL query results * @summary Implements pagination for PostgreSQL queries using LIMIT and OFFSET for efficient navigation through result sets * @template M - The model type that extends Model * @template R - The result type * @param {PostgresAdapter<any, any, any>} adapter - The PostgreSQL adapter * @param {PostgresQuery} query - The PostgresSQL query to paginate * @param {number} size - The page size * @param {Constructor<M>} clazz - The model constructor * @class PostgresPaginator * @example * // Example of using PostgreSQLPaginator * const adapter = new MyPostgreSQLAdapter(pool); * const query = { table: "users" }; * const paginator = new PostgreSQLPaginator(adapter, query, 10, User); * * // Get the first page * const page1 = await paginator.page(1); * * // Get the next page * const page2 = await paginator.page(2); */ class PostgresPaginator extends core_1.Paginator { /** * @description Gets the total number of pages * @summary Returns the total number of pages based on the record count and page size * @return {number} The total number of pages */ get total() { return this._totalPages; } /** * @description Gets the total record count * @summary Returns the total number of records matching the query * @return {number} The total record count */ get count() { return this._recordCount; } /** * @description Creates a new PostgreSQLPaginator instance * @summary Initializes a paginator for PostgreSQL query results * @param {PostgresAdapter} adapter - The PostgreSQL adapter * @param {PostgreSQLQuery} query - The PostgreSQL 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 {PostgresQuery} rawStatement - The original PostgreSQL query * @return {PostgresQuery} The prepared query with pagination parameters */ prepare(rawStatement) { const query = { ...rawStatement }; 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 an invalid page or if no class is defined * @mermaid * sequenceDiagram * participant Client * participant PostgreSQLPaginator * participant Adapter * participant PostgreSQL * * Client->>PostgreSQLPaginator: page(pageNumber) * Note over PostgreSQLPaginator: Clone statement * * alt First time or need count * PostgreSQLPaginator->>Adapter: Get total count * Adapter->>PostgreSQL: Execute COUNT query * PostgreSQL-->>Adapter: Return count * Adapter-->>PostgreSQLPaginator: Return count * PostgreSQLPaginator->>PostgreSQLPaginator: Calculate total pages * end * * PostgreSQLPaginator->>PostgreSQLPaginator: validatePage(page) * PostgreSQLPaginator->>PostgreSQLPaginator: Calculate offset * PostgreSQLPaginator->>PostgreSQLPaginator: Add limit and offset to query * * PostgreSQLPaginator->>Adapter: raw(statement, false) * Adapter->>PostgreSQL: Execute query * PostgreSQL-->>Adapter: Return results * Adapter-->>PostgreSQLPaginator: Return PostgreSQLResponse * * Note over PostgreSQLPaginator: Process results * * PostgreSQLPaginator->>PostgreSQLPaginator: Check for clazz * * alt No clazz * PostgreSQLPaginator-->>Client: Throw PagingError * else Has clazz * PostgreSQLPaginator->>PostgreSQLPaginator: Find primary key * * alt Has columns in statement * PostgreSQLPaginator->>PostgreSQLPaginator: Use rows directly * else No columns * PostgreSQLPaginator->>PostgreSQLPaginator: Process each row * loop For each row * PostgreSQLPaginator->>Adapter: revert(row, clazz, pkDef.id, id) * end * end * * PostgreSQLPaginator->>PostgreSQLPaginator: Update currentPage * PostgreSQLPaginator-->>Client: Return results * end */ async page(page = 1) { throw new Error(`Not implemented yet`); // const statement = { ...this.statement }; // // // Get total count if not already calculated // if (!this._recordCount || !this._totalPages) { // this._totalPages = this._recordCount = 0; // // // Create a count query based on the original query // const countQuery: PostgresQuery = { // ...statement, // count: true, // limit: undefined, // offset: undefined, // }; // // const countResult: QueryResult = await this.adapter.raw( // countQuery, // false // ); // this._recordCount = parseInt(countResult.rows[0]?.count || "0", 10); // // if (this._recordCount > 0) { // const size = statement?.limit || this.size; // this._totalPages = Math.ceil(this._recordCount / size); // } // } // // this.validatePage(page); // // // Calculate offset based on page number // const offset = (page - 1) * this.size; // statement.limit = this.size; // statement.offset = offset; // // const result: PostgreSQLResponse<any> = await this.adapter.raw( // statement, // false // ); // // if (!this.clazz) throw new PagingError("No statement target defined"); // // const pkDef = findPrimaryKey(new this.clazz()); // const rows = result.rows || []; // // const results = // statement.columns && statement.columns.length // ? rows // has columns means it's not full model // : rows.map((row: any) => { // return this.adapter.revert( // row, // this.clazz, // pkDef.id, // Sequence.parseValue(pkDef.props.type, row[PostgreSQLKeys.ID]) // ); // }); // // this._currentPage = page; // return results as R[]; } } exports.PostgresPaginator = PostgresPaginator; //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"Paginator.js","sourceRoot":"","sources":["../../src/query/Paginator.ts"],"names":[],"mappings":";;;AAAA,yCAA2C;AAK3C;;;;;;;;;;;;;;;;;;;;;GAqBG;AACH,MAAa,iBAAsC,SAAQ,gBAI1D;IACC;;;;OAIG;IACH,IAAa,KAAK;QAChB,OAAO,IAAI,CAAC,WAAW,CAAC;IAC1B,CAAC;IAED;;;;OAIG;IACH,IAAa,KAAK;QAChB,OAAO,IAAI,CAAC,YAAY,CAAC;IAC3B,CAAC;IAED;;;;;;;OAOG;IACH,YACE,OAAwB,EACxB,KAAoB,EACpB,IAAY,EACZ,KAAqB;QAErB,KAAK,CAAC,OAAO,EAAE,KAAK,EAAE,IAAI,EAAE,KAAK,CAAC,CAAC;IACrC,CAAC;IAED;;;;;OAKG;IACO,OAAO,CAAC,YAA2B;QAC3C,MAAM,KAAK,GAAkB,EAAE,GAAG,YAAY,EAAE,CAAC;QACjD,OAAO,KAAK,CAAC;IACf,CAAC;IAED;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;OAsDG;IACH,KAAK,CAAC,IAAI,CAAC,OAAe,CAAC;QACzB,MAAM,IAAI,KAAK,CAAC,qBAAqB,CAAC,CAAC;QACvC,2CAA2C;QAC3C,EAAE;QACF,+CAA+C;QAC/C,iDAAiD;QACjD,8CAA8C;QAC9C,EAAE;QACF,wDAAwD;QACxD,wCAAwC;QACxC,oBAAoB;QACpB,mBAAmB;QACnB,wBAAwB;QACxB,yBAAyB;QACzB,OAAO;QACP,EAAE;QACF,6DAA6D;QAC7D,kBAAkB;QAClB,YAAY;QACZ,OAAO;QACP,yEAAyE;QACzE,EAAE;QACF,iCAAiC;QACjC,kDAAkD;QAClD,8DAA8D;QAC9D,MAAM;QACN,IAAI;QACJ,EAAE;QACF,2BAA2B;QAC3B,EAAE;QACF,2CAA2C;QAC3C,yCAAyC;QACzC,+BAA+B;QAC/B,6BAA6B;QAC7B,EAAE;QACF,kEAAkE;QAClE,eAAe;QACf,UAAU;QACV,KAAK;QACL,EAAE;QACF,yEAAyE;QACzE,EAAE;QACF,kDAAkD;QAClD,kCAAkC;QAClC,EAAE;QACF,kBAAkB;QAClB,kDAAkD;QAClD,sDAAsD;QACtD,iCAAiC;QACjC,sCAAsC;QACtC,iBAAiB;QACjB,wBAAwB;QACxB,sBAAsB;QACtB,0EAA0E;QAC1E,aAAa;QACb,YAAY;QACZ,EAAE;QACF,4BAA4B;QAC5B,yBAAyB;IAC3B,CAAC;CACF;AAtKD,8CAsKC","sourcesContent":["import { Paginator } from \"@decaf-ts/core\";\nimport { PostgresQuery } from \"../types\";\nimport { Constructor, Model } from \"@decaf-ts/decorator-validation\";\nimport { PostgresAdapter } from \"../adapter\";\n\n/**\n * @description Paginator for PostgreSQL query results\n * @summary Implements pagination for PostgreSQL queries using LIMIT and OFFSET for efficient navigation through result sets\n * @template M - The model type that extends Model\n * @template R - The result type\n * @param {PostgresAdapter<any, any, any>} adapter - The PostgreSQL adapter\n * @param {PostgresQuery} query - The PostgresSQL query to paginate\n * @param {number} size - The page size\n * @param {Constructor<M>} clazz - The model constructor\n * @class PostgresPaginator\n * @example\n * // Example of using PostgreSQLPaginator\n * const adapter = new MyPostgreSQLAdapter(pool);\n * const query = { table: \"users\" };\n * const paginator = new PostgreSQLPaginator(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 PostgresPaginator<M extends Model, R> extends Paginator<\n  M,\n  R,\n  PostgresQuery\n> {\n  /**\n   * @description Gets the total number of pages\n   * @summary Returns the total number of pages based on the record count and page size\n   * @return {number} The total number of pages\n   */\n  override get total(): number {\n    return this._totalPages;\n  }\n\n  /**\n   * @description Gets the total record count\n   * @summary Returns the total number of records matching the query\n   * @return {number} The total record count\n   */\n  override get count(): number {\n    return this._recordCount;\n  }\n\n  /**\n   * @description Creates a new PostgreSQLPaginator instance\n   * @summary Initializes a paginator for PostgreSQL query results\n   * @param {PostgresAdapter} adapter - The PostgreSQL adapter\n   * @param {PostgreSQLQuery} query - The PostgreSQL query to paginate\n   * @param {number} size - The page size\n   * @param {Constructor<M>} clazz - The model constructor\n   */\n  constructor(\n    adapter: PostgresAdapter,\n    query: PostgresQuery,\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 {PostgresQuery} rawStatement - The original PostgreSQL query\n   * @return {PostgresQuery} The prepared query with pagination parameters\n   */\n  protected prepare(rawStatement: PostgresQuery): PostgresQuery {\n    const query: PostgresQuery = { ...rawStatement };\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 an invalid page or if no class is defined\n   * @mermaid\n   * sequenceDiagram\n   *   participant Client\n   *   participant PostgreSQLPaginator\n   *   participant Adapter\n   *   participant PostgreSQL\n   *\n   *   Client->>PostgreSQLPaginator: page(pageNumber)\n   *   Note over PostgreSQLPaginator: Clone statement\n   *\n   *   alt First time or need count\n   *     PostgreSQLPaginator->>Adapter: Get total count\n   *     Adapter->>PostgreSQL: Execute COUNT query\n   *     PostgreSQL-->>Adapter: Return count\n   *     Adapter-->>PostgreSQLPaginator: Return count\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Calculate total pages\n   *   end\n   *\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: validatePage(page)\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Calculate offset\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Add limit and offset to query\n   *\n   *   PostgreSQLPaginator->>Adapter: raw(statement, false)\n   *   Adapter->>PostgreSQL: Execute query\n   *   PostgreSQL-->>Adapter: Return results\n   *   Adapter-->>PostgreSQLPaginator: Return PostgreSQLResponse\n   *\n   *   Note over PostgreSQLPaginator: Process results\n   *\n   *   PostgreSQLPaginator->>PostgreSQLPaginator: Check for clazz\n   *\n   *   alt No clazz\n   *     PostgreSQLPaginator-->>Client: Throw PagingError\n   *   else Has clazz\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Find primary key\n   *\n   *     alt Has columns in statement\n   *       PostgreSQLPaginator->>PostgreSQLPaginator: Use rows directly\n   *     else No columns\n   *       PostgreSQLPaginator->>PostgreSQLPaginator: Process each row\n   *       loop For each row\n   *         PostgreSQLPaginator->>Adapter: revert(row, clazz, pkDef.id, id)\n   *       end\n   *     end\n   *\n   *     PostgreSQLPaginator->>PostgreSQLPaginator: Update currentPage\n   *     PostgreSQLPaginator-->>Client: Return results\n   *   end\n   */\n  async page(page: number = 1): Promise<R[]> {\n    throw new Error(`Not implemented yet`);\n    // const statement = { ...this.statement };\n    //\n    // // Get total count if not already calculated\n    // if (!this._recordCount || !this._totalPages) {\n    //   this._totalPages = this._recordCount = 0;\n    //\n    //   // Create a count query based on the original query\n    //   const countQuery: PostgresQuery = {\n    //     ...statement,\n    //     count: true,\n    //     limit: undefined,\n    //     offset: undefined,\n    //   };\n    //\n    //   const countResult: QueryResult = await this.adapter.raw(\n    //     countQuery,\n    //     false\n    //   );\n    //   this._recordCount = parseInt(countResult.rows[0]?.count || \"0\", 10);\n    //\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    // // Calculate offset based on page number\n    // const offset = (page - 1) * this.size;\n    // statement.limit = this.size;\n    // statement.offset = offset;\n    //\n    // const result: PostgreSQLResponse<any> = await this.adapter.raw(\n    //   statement,\n    //   false\n    // );\n    //\n    // if (!this.clazz) throw new PagingError(\"No statement target defined\");\n    //\n    // const pkDef = findPrimaryKey(new this.clazz());\n    // const rows = result.rows || [];\n    //\n    // const results =\n    //   statement.columns && statement.columns.length\n    //     ? rows // has columns means it's not full model\n    //     : rows.map((row: any) => {\n    //         return this.adapter.revert(\n    //           row,\n    //           this.clazz,\n    //           pkDef.id,\n    //           Sequence.parseValue(pkDef.props.type, row[PostgreSQLKeys.ID])\n    //         );\n    //       });\n    //\n    // this._currentPage = page;\n    // return results as R[];\n  }\n}\n"]}