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export interface ColumnDataObject {
column: string;
property?: string;
references?: EntityConstructor;
primaryKey?: boolean;
}
export type ColumnData = ColumnDataObject & string;
export abstract class Entity {
static readonly tableName: string;
static readonly sqlColumnsData: Array<ColumnData>;
static readonly displayName?: string;
readonly BoCollection!: EntityCollectionConstructor;
[key:string]: any;
}
export type EntityConstructor = (new (props: object) => Entity) & Omit<typeof Entity, never>;
export abstract class EntityCollection {
static readonly Bo: EntityConstructor;
static readonly displayName?: string;
abstract models: Array<Entity>;
}
export type EntityCollectionConstructor = (new (props: object) => Entity) & Omit<typeof Entity, never>;
export const getPrimaryKey = (Bo: EntityConstructor): Array<string> => {
const pkColumnsData = Bo.sqlColumnsData.filter((x: ColumnData) => x.primaryKey);
const primaryKeys = pkColumnsData.map((x: ColumnData) => x.column);
return primaryKeys.length > 0 ? primaryKeys : ['id'];
};
export const getProperties = (Bo: EntityConstructor): Array<string> => {
return Bo.sqlColumnsData.map((x: ColumnData): string => x.property || camelCase(x.column || x));
};
export const getSqlColumns = (Bo: EntityConstructor): Array<string> => {
return Bo.sqlColumnsData.map((x: ColumnData): string => x.column || x);
};
export const getReferences = (Bo: EntityConstructor): object => {
return Bo.sqlColumnsData
.filter((x: ColumnData) => x.references)
.reduce(
(accum: any, item: ColumnData) =>
Object.assign({}, accum, {
[item.property || camelCase(item.column || item)]: item.references
}),
{}
);
};
export const getDisplayName = (Bo: EntityConstructor): string => {
return camelCase(Bo.tableName);
};
export const getTableName = (bo: Entity): string => {
return (bo.constructor as EntityConstructor).tableName;
};
export const getCollectionDisplayName = (bo: Entity): string => {
return (bo.BoCollection).displayName
|| `${getDisplayName(bo.constructor as EntityConstructor)}s`;
};
export const getPrefixedColumnNames = (Bo: EntityConstructor): Array<string> => {
return getSqlColumns(Bo).map((col: string) => `${Bo.tableName}#${col}`);
};
export const getColumns = (Bo: EntityConstructor): string => {
return getPrefixedColumnNames(Bo)
.map(
(prefixed: string, index: number) =>
`"${Bo.tableName}".${getSqlColumns(Bo)[index]} as "${prefixed}"`
)
.join(', ');
};
// Returns unique identifier of bo (the values of the primary keys)
export const getId = (bo: Entity): string => {
return getPrimaryKey(bo.constructor as EntityConstructor)
.map((key: string) => bo[key as keyof typeof bo])
.join('');
};
/*
* In:
* [
* [Article {id: 32}, ArticleTag {id: 54}]
* [Article {id: 32}, ArticleTag {id: 55}]
* ]
* Out:
* Article {id: 32, ArticleTags articleTags: [ArticleTag {id: 54}, ArticleTag {id: 55}]
*/
export const nestClump = (clump: Array<Array<Entity>>): object => {
clump = clump.map((x: Array<Entity>) => Object.values(x));
const root = clump[0][0];
clump = clump.map(
(row: Array<Entity>) => row.filter(
(item: Entity, index: number) => index !== 0
)
);
const built = { [getDisplayName(root.constructor as EntityConstructor)]: root };
let nodes = [root];
// Wowzer is this both CPU and Memory inefficient
clump.forEach((array: Array<Entity>) => {
array.forEach((_bo: Entity) => {
const nodeAlreadySeen = nodes.find(
(x: Entity) =>
x.constructor.name === _bo.constructor.name && getId(x) === getId(_bo)
);
const bo = nodeAlreadySeen || _bo;
const isNodeAlreadySeen = !!nodeAlreadySeen;
const nodePointingToIt = nodes.find(node => {
const indexes = Object.values(getReferences(node.constructor as EntityConstructor))
.map((x: EntityConstructor, i: number) => (x === bo.constructor ? i : null))
.filter((x: number | null, i) => x != null) as Array<number>;
if (!indexes.length) {
return false;
}
for (const index of indexes) {
const property = Object.keys(getReferences(node.constructor as EntityConstructor))[index];
if (node[property] === bo.id) {
return true;
}
}
return false;
});
// For first obj type which is has an instance in nodes array,
// get its index in nodes array
const indexOfOldestParent = array.reduce((answer: number, obj: Entity) => {
if (answer != 0) {
return answer;
}
const index = nodes.findIndex(n => n.constructor === obj.constructor);
if (index !== -1) {
return index;
}
return 0;
}, 0);
const parentHeirarchy = [
root,
...nodes.slice(0, indexOfOldestParent + 1).reverse()
];
const nodeItPointsTo = parentHeirarchy.find(parent => {
const index = Object.values(getReferences(bo.constructor as EntityConstructor)).indexOf(
parent.constructor
);
if (index === -1) {
return false;
}
const property = Object.keys(getReferences(bo.constructor as EntityConstructor))[index];
return bo[property as keyof typeof bo] === parent.id;
});
if (isNodeAlreadySeen) {
if (nodeItPointsTo && !nodePointingToIt) {
nodes = [bo, ...nodes];
return;
}
// If the nodePointingToIt (eg, parcel_event) is part of an
// existing collection on this node (eg, parcel) which is a
// nodeAlreadySeen, early return so we don't create it (parcel) on
// the nodePointingToIt (parcel_event), since it (parcel) has been
// shown to be the parent (of parcel_events).
Eif (nodePointingToIt) {
const ec = bo[getCollectionDisplayName(nodePointingToIt) as keyof typeof bo];
if (ec && ec.models.find((m: Entity) => m === nodePointingToIt)) {
nodes = [bo, ...nodes];
return;
}
}
}
if (nodePointingToIt) {
nodePointingToIt[getDisplayName(bo.constructor as EntityConstructor)] = bo;
} else if (nodeItPointsTo) {
let collection = nodeItPointsTo[getCollectionDisplayName(bo)];
if (collection) {
collection.models.push(bo);
} else {
nodeItPointsTo[getCollectionDisplayName(bo)] = new bo.BoCollection({
models: [bo]
});
}
} else {
Eif (!getId(bo)) {
// If the join is fruitless; todo: add a test for this path
return;
}
throw Error(`Could not find how this BO fits: ${JSON.stringify(bo)}`);
}
nodes = [bo, ...nodes];
});
});
return built;
};
/*
* Clump array of flat objects into groups based on id of root
* In:
* [
* [Article {id: 32}, ArticleTag {id: 54}]
* [Article {id: 32}, ArticleTag {id: 55}]
* [Article {id: 33}, ArticleTag {id: 56}]
* ]
* Out:
* [
* [
* [Article {id: 32}, ArticleTag {id: 54}]
* [Article {id: 32}, ArticleTag {id: 55}]
* ]
* [
* [Article {id: 33}, ArticleTag {id: 56}]
* ]
* ]
*/
export const clumpIntoGroups = (processed: Array<Array<Entity>>): Array<Array<Array<Entity>>> => {
const rootBo = processed[0][0].constructor;
const clumps = processed.reduce((accum: any, item: Array<Entity>) => {
const id = getPrimaryKey(rootBo as EntityConstructor)
.map((key: string) => item.find((x: Entity) => x.constructor === rootBo)?.[key])
.join('@');
if (accum.has(id)) {
accum.set(id, [...accum.get(id), item]);
} else {
accum.set(id, [item]);
}
return accum;
}, new Map());
return [...clumps.values()];
};
export const mapToBos = (objectified: any, getBusinessObjects: () => Array<EntityConstructor>) => {
return Object.keys(objectified).map(tableName => {
const Bo = getBusinessObjects().find((Bo: EntityConstructor) => Bo.tableName === tableName);
Iif (!Bo) {
throw Error(`No business object with table name "${tableName}"`);
}
const propified = Object.keys(objectified[tableName]).reduce(
(obj: any, column) => {
let propertyName = getProperties(Bo)[getSqlColumns(Bo).indexOf(column)];
Iif (!propertyName) {
if (column.startsWith('meta_')) {
propertyName = camelCase(column);
} else {
throw Error(
`No property name for "${column}" in business object "${getDisplayName(
Bo
)}". Non-spec'd columns must begin with "meta_".`
);
}
}
obj[propertyName] = objectified[tableName][column];
return obj;
},
{}
);
return new Bo(propified);
});
};
/*
* Make objects (based on special table#column names) from flat database
* return value.
*/
export const objectifyDatabaseResult = (result: object) => {
return Object.keys(result).reduce((obj: any, text: string) => {
const tableName = text.split('#')[0];
const column = text.split('#')[1];
obj[tableName] = obj[tableName] || {};
obj[tableName][column] = result[text as keyof typeof result];
return obj;
}, {});
};
export const createFromDatabase = (_result: Array<object> | object, getBusinessObjects: () => Array<EntityConstructor>) => {
const result = Array.isArray(_result) ? _result : [_result];
const objectified = result.map(objectifyDatabaseResult);
const boified = objectified.map((x: any) => mapToBos(x, getBusinessObjects));
const clumps = clumpIntoGroups(boified);
const nested = clumps.map(nestClump);
const models = nested.map(n => Object.values(n)[0]);
return models.length ? new models[0].BoCollection({ models }) : void 0;
};
export const createOneFromDatabase = (_result: any, getBusinessObjects: () => Array<EntityConstructor>) => {
const collection = createFromDatabase(_result, getBusinessObjects);
Iif (!collection || collection.models.length === 0) {
throw Error('Did not get one.');
} else Iif (collection.models.length > 1) {
throw Error('Got more than one.');
}
return collection.models[0];
};
export const createOneOrNoneFromDatabase = (_result: any, getBusinessObjects: () => Array<EntityConstructor>) => {
if (!_result) {
return _result;
}
const collection = createFromDatabase(_result, getBusinessObjects);
if (collection && collection.models.length > 1) {
throw Error('Got more than one.');
}
return collection && collection.models[0];
};
export const createManyFromDatabase = (_result: any, getBusinessObjects: () => Array<EntityConstructor>) => {
const collection = createFromDatabase(_result, getBusinessObjects);
if (!collection || collection.models.length === 0) {
throw Error('Did not get at least one.');
}
return collection;
};
export const getSqlInsertParts = (bo: Entity) => {
const columns = getSqlColumns(bo.constructor as EntityConstructor)
.filter(
(column: string, index: number) => bo[getProperties(bo.constructor as EntityConstructor)[index] as keyof typeof bo] !== void 0
)
.map((col: string) => `"${col}"`)
.join(', ');
const values = getProperties(bo.constructor as EntityConstructor)
.map((property: string) => bo[property as keyof typeof bo])
.filter((value: any) => value !== void 0);
const valuesVar = values.map((value: any, index: number) => `$${index + 1}`);
return { columns, values, valuesVar };
};
export const getSqlUpdateParts = (bo: Entity, on = 'id') => {
const clauseArray = getSqlColumns(bo.constructor as EntityConstructor)
.filter(
(sqlColumn: string, index: number) => bo[getProperties(bo.constructor as EntityConstructor)[index] as keyof typeof bo] !== void 0
)
.map((sqlColumn: string, index: number) => `"${sqlColumn}" = $${index + 1}`);
const clause = clauseArray.join(', ');
const idVar = `$${clauseArray.length + 1}`;
const _values = getProperties(bo.constructor as EntityConstructor)
.map((property: string) => bo[property as keyof typeof bo])
.filter((value: any) => value !== void 0);
const values = [..._values, bo[on as keyof typeof bo]];
return { clause, idVar, values };
};
export const getMatchingParts = (bo: Entity) => {
const whereClause = getProperties(bo.constructor as EntityConstructor)
.map((property: string, index: number) =>
bo[property as keyof typeof bo] != null
? `"${(bo.constructor as EntityConstructor).tableName}"."${
getSqlColumns(bo.constructor as EntityConstructor)[index]
}"`
: null
)
.filter((x: string | null) => x != null)
.map((x: string | null, i: number) => `${x} = $${i + 1}`)
.join(' AND ');
const values = getProperties(bo.constructor as EntityConstructor)
.map((property: string) => (bo[property as keyof typeof bo] != null ? bo[property as keyof typeof bo] : null))
.filter((x: any) => x != null);
return { whereClause, values };
};
// This one returns an object, which allows it to be more versatile.
// To-do: make this one even better and use it instead of the one above.
export const getMatchingPartsObject = (bo: Entity) => {
const whereClause = getProperties(bo.constructor as EntityConstructor)
.map((property: string, index: number) =>
bo[property as keyof typeof bo] != null
? `"${(bo.constructor as EntityConstructor).tableName}"."${
getSqlColumns(bo.constructor as EntityConstructor)[index]
}"`
: null
)
.filter((x: string | null) => x != null)
.map((x: string | null, i: number) => `${x} = $(${i + 1})`)
.join(' AND ');
const values = getProperties(bo.constructor as EntityConstructor)
.map((property: string) => (bo[property as keyof typeof bo] != null ? bo[property as keyof typeof bo] : null))
.filter((x: any) => x != null)
.reduce(
(accum: any, val: any, index: number) => Object.assign({}, accum, { [index + 1]: val }),
{}
);
return { whereClause, values };
};
export const getNewWith = (bo: Entity, sqlColumns: any, values: any) => {
const Constructor = bo.constructor as any;
const boKeys = sqlColumns.map(
(key: string) => getProperties(Constructor)[getSqlColumns(Constructor).indexOf(key)]
);
const boData = boKeys.reduce((data: any, key: string, index: number) => {
data[key] = values[index];
return data;
}, {});
return new Constructor(boData);
};
export const getValueBySqlColumn = (bo: Entity, sqlColumn: string) => {
return bo[
getProperties(bo.constructor as EntityConstructor)[
getSqlColumns(bo.constructor as EntityConstructor).indexOf(sqlColumn)
] as keyof typeof bo
];
};
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