@decaf-ts/for-couchdb
Version:
template for ts projects
282 lines • 36.9 kB
JavaScript
import { Condition, GroupOperator, Operator, Repository, Sequence, Statement, } from "@decaf-ts/core";
import { translateOperators } from "./translate.js";
import { CouchDBKeys } from "./../constants.js";
import { CouchDBGroupOperator, CouchDBOperator, CouchDBQueryLimit, } from "./constants.js";
import { CouchDBPaginator } from "./Paginator.js";
import { findPrimaryKey, InternalError } from "@decaf-ts/db-decorators";
/**
* @description Statement builder for CouchDB Mango queries
* @summary Provides a fluent interface for building CouchDB Mango queries with type safety
* @template M - The model type that extends Model
* @template R - The result type
* @param adapter - The CouchDB adapter
* @class CouchDBStatement
* @example
* // Example of using CouchDBStatement
* const adapter = new MyCouchDBAdapter(scope);
* const statement = new CouchDBStatement<User, User[]>(adapter);
*
* // Build a query
* const users = await statement
* .from(User)
* .where(Condition.attribute<User>('age').gt(18))
* .orderBy('lastName', 'asc')
* .limit(10)
* .execute();
*/
export class CouchDBStatement extends Statement {
constructor(adapter) {
super(adapter);
}
/**
* @description Builds a CouchDB Mango query from the statement
* @summary Converts the statement's conditions, selectors, and options into a CouchDB Mango query
* @return {MangoQuery} The built Mango query
* @throws {Error} If there are invalid query conditions
* @mermaid
* sequenceDiagram
* participant Statement
* participant Repository
* participant parseCondition
*
* Statement->>Statement: build()
* Note over Statement: Initialize selectors
* Statement->>Repository: Get table name
* Repository-->>Statement: Return table name
* Statement->>Statement: Create base query
*
* alt Has selectSelector
* Statement->>Statement: Add fields to query
* end
*
* alt Has whereCondition
* Statement->>Statement: Create combined condition with table
* Statement->>parseCondition: Parse condition
* parseCondition-->>Statement: Return parsed condition
*
* alt Is group operator
* alt Is AND operator
* Statement->>Statement: Flatten nested AND conditions
* else Is OR operator
* Statement->>Statement: Combine with table condition
* else
* Statement->>Statement: Throw error
* end
* else
* Statement->>Statement: Merge conditions with existing selector
* end
* end
*
* alt Has orderBySelector
* Statement->>Statement: Add sort to query
* Statement->>Statement: Ensure field exists in selector
* end
*
* alt Has limitSelector
* Statement->>Statement: Set limit
* else
* Statement->>Statement: Use default limit
* end
*
* alt Has offsetSelector
* Statement->>Statement: Set skip
* end
*
* Statement-->>Statement: Return query
*/
build() {
const selectors = {};
selectors[CouchDBKeys.TABLE] = {};
selectors[CouchDBKeys.TABLE] = Repository.table(this.fromSelector);
const query = { selector: selectors };
if (this.selectSelector)
query.fields = this.selectSelector;
if (this.whereCondition) {
const condition = this.parseCondition(Condition.and(this.whereCondition, Condition.attribute(CouchDBKeys.TABLE).eq(query.selector[CouchDBKeys.TABLE]))).selector;
const selectorKeys = Object.keys(condition);
if (selectorKeys.length === 1 &&
Object.values(CouchDBGroupOperator).indexOf(selectorKeys[0]) !== -1)
switch (selectorKeys[0]) {
case CouchDBGroupOperator.AND:
condition[CouchDBGroupOperator.AND] = [
...Object.values(condition[CouchDBGroupOperator.AND]).reduce((accum, val) => {
const keys = Object.keys(val);
if (keys.length !== 1)
throw new Error("Too many keys in query selector. should be one");
const k = keys[0];
if (k === CouchDBGroupOperator.AND)
accum.push(...val[k]);
else
accum.push(val);
return accum;
}, []),
];
query.selector = condition;
break;
case CouchDBGroupOperator.OR: {
const s = {};
s[CouchDBGroupOperator.AND] = [
condition,
...Object.entries(query.selector).map(([key, val]) => {
const result = {};
result[key] = val;
return result;
}),
];
query.selector = s;
break;
}
default:
throw new Error("This should be impossible");
}
else {
Object.entries(condition).forEach(([key, val]) => {
if (query.selector[key])
console.warn(`A ${key} query param is about to be overridden: ${query.selector[key]} by ${val}`);
query.selector[key] = val;
});
}
}
if (this.orderBySelector) {
query.sort = query.sort || [];
query.selector = query.selector || {};
const [selector, value] = this.orderBySelector;
const rec = {};
rec[selector] = value;
query.sort.push(rec);
if (!query.selector[selector]) {
query.selector[selector] = {};
query.selector[selector][CouchDBOperator.BIGGER] =
null;
}
}
if (this.limitSelector) {
query.limit = this.limitSelector;
}
else {
console.warn(`No limit selector defined. Using default couchdb limit of ${CouchDBQueryLimit}`);
query.limit = CouchDBQueryLimit;
}
if (this.offsetSelector)
query.skip = this.offsetSelector;
return query;
}
/**
* @description Creates a paginator for the statement
* @summary Builds the query and returns a CouchDBPaginator for paginated results
* @template R - The result type
* @param {number} size - The page size
* @return {Promise<Paginator<M, R, MangoQuery>>} A promise that resolves to a paginator
* @throws {InternalError} If there's an error building the query
*/
async paginate(size) {
try {
const query = this.build();
return new CouchDBPaginator(this.adapter, query, size, this.fromSelector);
}
catch (e) {
throw new InternalError(e);
}
}
/**
* @description Processes a record from CouchDB
* @summary Extracts the ID from a CouchDB document and reverts it to a model instance
* @param {any} r - The raw record from CouchDB
* @param pkAttr - The primary key attribute of the model
* @param {"Number" | "BigInt" | undefined} sequenceType - The type of the sequence
* @return {any} The processed record
*/
processRecord(r, pkAttr, sequenceType) {
if (r[CouchDBKeys.ID]) {
const [, ...keyArgs] = r[CouchDBKeys.ID].split(CouchDBKeys.SEPARATOR);
const id = keyArgs.join("_");
return this.adapter.revert(r, this.fromSelector, pkAttr, Sequence.parseValue(sequenceType, id));
}
return r;
}
/**
* @description Executes a raw Mango query
* @summary Sends a raw Mango query to CouchDB and processes the results
* @template R - The result type
* @param {MangoQuery} rawInput - The raw Mango query to execute
* @return {Promise<R>} A promise that resolves to the query results
*/
async raw(rawInput) {
const results = await this.adapter.raw(rawInput, true);
const pkDef = findPrimaryKey(new this.fromSelector());
const pkAttr = pkDef.id;
const type = pkDef.props.type;
if (!this.selectSelector)
return results.map((r) => this.processRecord(r, pkAttr, type));
return results;
}
/**
* @description Parses a condition into a CouchDB Mango query selector
* @summary Converts a Condition object into a CouchDB Mango query selector structure
* @param {Condition<M>} condition - The condition to parse
* @return {MangoQuery} The Mango query with the parsed condition as its selector
* @mermaid
* sequenceDiagram
* participant Statement
* participant translateOperators
* participant merge
*
* Statement->>Statement: parseCondition(condition)
*
* Note over Statement: Extract condition parts
*
* alt Simple comparison operator
* Statement->>translateOperators: translateOperators(operator)
* translateOperators-->>Statement: Return CouchDB operator
* Statement->>Statement: Create selector with attribute and operator
* else NOT operator
* Statement->>Statement: parseCondition(attr1)
* Statement->>translateOperators: translateOperators(Operator.NOT)
* translateOperators-->>Statement: Return CouchDB NOT operator
* Statement->>Statement: Create negated selector
* else AND/OR operator
* Statement->>Statement: parseCondition(attr1)
* Statement->>Statement: parseCondition(comparison)
* Statement->>translateOperators: translateOperators(operator)
* translateOperators-->>Statement: Return CouchDB group operator
* Statement->>merge: merge(operator, op1, op2)
* merge-->>Statement: Return merged selector
* end
*
* Statement-->>Statement: Return query with selector
*/
parseCondition(condition) {
/**
* @description Merges two selectors with a logical operator
* @summary Helper function to combine two selectors with a logical operator
* @param {MangoOperator} op - The operator to use for merging
* @param {MangoSelector} obj1 - The first selector
* @param {MangoSelector} obj2 - The second selector
* @return {MangoQuery} The merged query
*/
function merge(op, obj1, obj2) {
const result = { selector: {} };
result.selector[op] = [obj1, obj2];
return result;
}
const { attr1, operator, comparison } = condition;
let op = {};
if ([GroupOperator.AND, GroupOperator.OR, Operator.NOT].indexOf(operator) === -1) {
op[attr1] = {};
op[attr1][translateOperators(operator)] =
comparison;
}
else if (operator === Operator.NOT) {
op = this.parseCondition(attr1).selector;
op[translateOperators(Operator.NOT)] = {};
op[translateOperators(Operator.NOT)][attr1.attr1] = comparison;
}
else {
const op1 = this.parseCondition(attr1).selector;
const op2 = this.parseCondition(comparison).selector;
op = merge(translateOperators(operator), op1, op2).selector;
}
return { selector: op };
}
}
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{\n  Condition,\n  GroupOperator,\n  Operator,\n  OrderDirection,\n  Paginator,\n  Repository,\n  Sequence,\n  Statement,\n} from \"@decaf-ts/core\";\nimport { MangoOperator, MangoQuery, MangoSelector } from \"../types\";\nimport { Model } from \"@decaf-ts/decorator-validation\";\nimport { CouchDBAdapter } from \"../adapter\";\nimport { translateOperators } from \"./translate\";\nimport { CouchDBKeys } from \"../constants\";\nimport {\n  CouchDBGroupOperator,\n  CouchDBOperator,\n  CouchDBQueryLimit,\n} from \"./constants\";\nimport { CouchDBPaginator } from \"./Paginator\";\nimport { findPrimaryKey, InternalError } from \"@decaf-ts/db-decorators\";\n\n/**\n * @description Statement builder for CouchDB Mango queries\n * @summary Provides a fluent interface for building CouchDB Mango queries with type safety\n * @template M - The model type that extends Model\n * @template R - The result type\n * @param adapter - The CouchDB adapter\n * @class CouchDBStatement\n * @example\n * // Example of using CouchDBStatement\n * const adapter = new MyCouchDBAdapter(scope);\n * const statement = new CouchDBStatement<User, User[]>(adapter);\n *\n * // Build a query\n * const users = await statement\n *   .from(User)\n *   .where(Condition.attribute<User>('age').gt(18))\n *   .orderBy('lastName', 'asc')\n *   .limit(10)\n *   .execute();\n */\nexport class CouchDBStatement<M extends Model, R> extends Statement<\n  MangoQuery,\n  M,\n  R\n> {\n  constructor(adapter: CouchDBAdapter<any, any, any>) {\n    super(adapter);\n  }\n\n  /**\n   * @description Builds a CouchDB Mango query from the statement\n   * @summary Converts the statement's conditions, selectors, and options into a CouchDB Mango query\n   * @return {MangoQuery} The built Mango query\n   * @throws {Error} If there are invalid query conditions\n   * @mermaid\n   * sequenceDiagram\n   *   participant Statement\n   *   participant Repository\n   *   participant parseCondition\n   *\n   *   Statement->>Statement: build()\n   *   Note over Statement: Initialize selectors\n   *   Statement->>Repository: Get table name\n   *   Repository-->>Statement: Return table name\n   *   Statement->>Statement: Create base query\n   *\n   *   alt Has selectSelector\n   *     Statement->>Statement: Add fields to query\n   *   end\n   *\n   *   alt Has whereCondition\n   *     Statement->>Statement: Create combined condition with table\n   *     Statement->>parseCondition: Parse condition\n   *     parseCondition-->>Statement: Return parsed condition\n   *\n   *     alt Is group operator\n   *       alt Is AND operator\n   *         Statement->>Statement: Flatten nested AND conditions\n   *       else Is OR operator\n   *         Statement->>Statement: Combine with table condition\n   *       else\n   *         Statement->>Statement: Throw error\n   *       end\n   *     else\n   *       Statement->>Statement: Merge conditions with existing selector\n   *     end\n   *   end\n   *\n   *   alt Has orderBySelector\n   *     Statement->>Statement: Add sort to query\n   *     Statement->>Statement: Ensure field exists in selector\n   *   end\n   *\n   *   alt Has limitSelector\n   *     Statement->>Statement: Set limit\n   *   else\n   *     Statement->>Statement: Use default limit\n   *   end\n   *\n   *   alt Has offsetSelector\n   *     Statement->>Statement: Set skip\n   *   end\n   *\n   *   Statement-->>Statement: Return query\n   */\n  protected build(): MangoQuery {\n    const selectors: MangoSelector = {};\n    selectors[CouchDBKeys.TABLE] = {};\n    selectors[CouchDBKeys.TABLE] = Repository.table(this.fromSelector);\n    const query: MangoQuery = { selector: selectors };\n    if (this.selectSelector) query.fields = this.selectSelector as string[];\n\n    if (this.whereCondition) {\n      const condition: MangoSelector = this.parseCondition(\n        Condition.and(\n          this.whereCondition,\n          Condition.attribute<M>(CouchDBKeys.TABLE as keyof M).eq(\n            query.selector[CouchDBKeys.TABLE]\n          )\n        )\n      ).selector;\n      const selectorKeys = Object.keys(condition) as MangoOperator[];\n      if (\n        selectorKeys.length === 1 &&\n        Object.values(CouchDBGroupOperator).indexOf(selectorKeys[0]) !== -1\n      )\n        switch (selectorKeys[0]) {\n          case CouchDBGroupOperator.AND:\n            condition[CouchDBGroupOperator.AND] = [\n              ...Object.values(\n                condition[CouchDBGroupOperator.AND] as MangoSelector\n              ).reduce((accum: MangoSelector[], val: any) => {\n                const keys = Object.keys(val);\n                if (keys.length !== 1)\n                  throw new Error(\n                    \"Too many keys in query selector. should be one\"\n                  );\n                const k = keys[0];\n                if (k === CouchDBGroupOperator.AND)\n                  accum.push(...(val[k] as any[]));\n                else accum.push(val);\n                return accum;\n              }, []),\n            ];\n            query.selector = condition;\n            break;\n          case CouchDBGroupOperator.OR: {\n            const s: Record<any, any> = {};\n            s[CouchDBGroupOperator.AND] = [\n              condition,\n              ...Object.entries(query.selector).map(([key, val]) => {\n                const result: Record<any, any> = {};\n                result[key] = val;\n                return result;\n              }),\n            ];\n            query.selector = s;\n            break;\n          }\n          default:\n            throw new Error(\"This should be impossible\");\n        }\n      else {\n        Object.entries(condition).forEach(([key, val]) => {\n          if (query.selector[key])\n            console.warn(\n              `A ${key} query param is about to be overridden: ${query.selector[key]} by ${val}`\n            );\n          query.selector[key] = val;\n        });\n      }\n    }\n\n    if (this.orderBySelector) {\n      query.sort = query.sort || [];\n      query.selector = query.selector || ({} as MangoSelector);\n      const [selector, value] = this.orderBySelector as [\n        string,\n        OrderDirection,\n      ];\n      const rec: any = {};\n      rec[selector] = value;\n      (query.sort as any[]).push(rec as any);\n      if (!query.selector[selector]) {\n        query.selector[selector] = {} as MangoSelector;\n        (query.selector[selector] as MangoSelector)[CouchDBOperator.BIGGER] =\n          null;\n      }\n    }\n\n    if (this.limitSelector) {\n      query.limit = this.limitSelector;\n    } else {\n      console.warn(\n        `No limit selector defined. Using default couchdb limit of ${CouchDBQueryLimit}`\n      );\n      query.limit = CouchDBQueryLimit;\n    }\n\n    if (this.offsetSelector) query.skip = this.offsetSelector;\n\n    return query;\n  }\n\n  /**\n   * @description Creates a paginator for the statement\n   * @summary Builds the query and returns a CouchDBPaginator for paginated results\n   * @template R - The result type\n   * @param {number} size - The page size\n   * @return {Promise<Paginator<M, R, MangoQuery>>} A promise that resolves to a paginator\n   * @throws {InternalError} If there's an error building the query\n   */\n  async paginate<R>(size: number): Promise<Paginator<M, R, MangoQuery>> {\n    try {\n      const query: MangoQuery = this.build();\n      return new CouchDBPaginator(\n        this.adapter as any,\n        query,\n        size,\n        this.fromSelector\n      );\n    } catch (e: any) {\n      throw new InternalError(e);\n    }\n  }\n\n  /**\n   * @description Processes a record from CouchDB\n   * @summary Extracts the ID from a CouchDB document and reverts it to a model instance\n   * @param {any} r - The raw record from CouchDB\n   * @param pkAttr - The primary key attribute of the model\n   * @param {\"Number\" | \"BigInt\" | undefined} sequenceType - The type of the sequence\n   * @return {any} The processed record\n   */\n  protected processRecord(\n    r: any,\n    pkAttr: keyof M,\n    sequenceType: \"Number\" | \"BigInt\" | undefined\n  ) {\n    if (r[CouchDBKeys.ID]) {\n      const [, ...keyArgs] = r[CouchDBKeys.ID].split(CouchDBKeys.SEPARATOR);\n\n      const id = keyArgs.join(\"_\");\n      return this.adapter.revert(\n        r,\n        this.fromSelector,\n        pkAttr,\n        Sequence.parseValue(sequenceType, id)\n      );\n    }\n    return r;\n  }\n\n  /**\n   * @description Executes a raw Mango query\n   * @summary Sends a raw Mango query to CouchDB and processes the results\n   * @template R - The result type\n   * @param {MangoQuery} rawInput - The raw Mango query to execute\n   * @return {Promise<R>} A promise that resolves to the query results\n   */\n  override async raw<R>(rawInput: MangoQuery): Promise<R> {\n    const results: any[] = await this.adapter.raw(rawInput, true);\n\n    const pkDef = findPrimaryKey(new this.fromSelector());\n    const pkAttr = pkDef.id;\n    const type = pkDef.props.type;\n\n    if (!this.selectSelector)\n      return results.map((r) => this.processRecord(r, pkAttr, type)) as R;\n    return results as R;\n  }\n\n  /**\n   * @description Parses a condition into a CouchDB Mango query selector\n   * @summary Converts a Condition object into a CouchDB Mango query selector structure\n   * @param {Condition<M>} condition - The condition to parse\n   * @return {MangoQuery} The Mango query with the parsed condition as its selector\n   * @mermaid\n   * sequenceDiagram\n   *   participant Statement\n   *   participant translateOperators\n   *   participant merge\n   *\n   *   Statement->>Statement: parseCondition(condition)\n   *\n   *   Note over Statement: Extract condition parts\n   *\n   *   alt Simple comparison operator\n   *     Statement->>translateOperators: translateOperators(operator)\n   *     translateOperators-->>Statement: Return CouchDB operator\n   *     Statement->>Statement: Create selector with attribute and operator\n   *   else NOT operator\n   *     Statement->>Statement: parseCondition(attr1)\n   *     Statement->>translateOperators: translateOperators(Operator.NOT)\n   *     translateOperators-->>Statement: Return CouchDB NOT operator\n   *     Statement->>Statement: Create negated selector\n   *   else AND/OR operator\n   *     Statement->>Statement: parseCondition(attr1)\n   *     Statement->>Statement: parseCondition(comparison)\n   *     Statement->>translateOperators: translateOperators(operator)\n   *     translateOperators-->>Statement: Return CouchDB group operator\n   *     Statement->>merge: merge(operator, op1, op2)\n   *     merge-->>Statement: Return merged selector\n   *   end\n   *\n   *   Statement-->>Statement: Return query with selector\n   */\n  protected parseCondition(condition: Condition<M>): MangoQuery {\n    /**\n     * @description Merges two selectors with a logical operator\n     * @summary Helper function to combine two selectors with a logical operator\n     * @param {MangoOperator} op - The operator to use for merging\n     * @param {MangoSelector} obj1 - The first selector\n     * @param {MangoSelector} obj2 - The second selector\n     * @return {MangoQuery} The merged query\n     */\n    function merge(\n      op: MangoOperator,\n      obj1: MangoSelector,\n      obj2: MangoSelector\n    ): MangoQuery {\n      const result: MangoQuery = { selector: {} as MangoSelector };\n      result.selector[op] = [obj1, obj2];\n      return result;\n    }\n\n    const { attr1, operator, comparison } = condition as unknown as {\n      attr1: string | Condition<M>;\n      operator: Operator | GroupOperator;\n      comparison: any;\n    };\n\n    let op: MangoSelector = {} as MangoSelector;\n    if (\n      [GroupOperator.AND, GroupOperator.OR, Operator.NOT].indexOf(\n        operator as GroupOperator\n      ) === -1\n    ) {\n      op[attr1 as string] = {} as MangoSelector;\n      (op[attr1 as string] as MangoSelector)[translateOperators(operator)] =\n        comparison;\n    } else if (operator === Operator.NOT) {\n      op = this.parseCondition(attr1 as Condition<M>).selector as MangoSelector;\n      op[translateOperators(Operator.NOT)] = {} as MangoSelector;\n      (op[translateOperators(Operator.NOT)] as MangoSelector)[\n        (attr1 as unknown as { attr1: string }).attr1\n      ] = comparison;\n    } else {\n      const op1: any = this.parseCondition(attr1 as Condition<M>).selector;\n      const op2: any = this.parseCondition(comparison as Condition<M>).selector;\n      op = merge(translateOperators(operator), op1, op2).selector;\n    }\n\n    return { selector: op };\n  }\n}\n"]}