typeorm
Version:
Data-Mapper ORM for TypeScript, ES7, ES6, ES5. Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, MongoDB databases.
149 lines (147 loc) • 7.99 kB
JavaScript
import { DateUtils } from "../util/DateUtils";
import { EntityMetadata } from "../metadata/EntityMetadata";
/**
* Finds what columns are changed in the subject entities.
*/
var SubjectChangedColumnsComputer = /** @class */ (function () {
function SubjectChangedColumnsComputer() {
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
/**
* Finds what columns are changed in the subject entities.
*/
SubjectChangedColumnsComputer.prototype.compute = function (subjects) {
var _this = this;
subjects.forEach(function (subject) {
_this.computeDiffColumns(subject);
_this.computeDiffRelationalColumns(subjects, subject);
});
};
// -------------------------------------------------------------------------
// Protected Methods
// -------------------------------------------------------------------------
/**
* Differentiate columns from the updated entity and entity stored in the database.
*/
SubjectChangedColumnsComputer.prototype.computeDiffColumns = function (subject) {
// if there is no persisted entity then nothing to compute changed in it
if (!subject.entity)
return;
subject.metadata.columns.forEach(function (column) {
// ignore special columns
if (column.isVirtual ||
column.isDiscriminator ||
column.isUpdateDate ||
column.isVersion ||
column.isCreateDate)
return;
// get user provided value - column value from the user provided persisted entity
var entityValue = column.getEntityValue(subject.entity);
// we don't perform operation over undefined properties (but we DO need null properties!)
if (entityValue === undefined)
return;
// if there is no database entity then all columns are treated as new, e.g. changed
if (subject.databaseEntity) {
// get database value of the column
var databaseValue = column.getEntityValue(subject.databaseEntity);
// filter out "relational columns" only in the case if there is a relation object in entity
if (column.relationMetadata) {
var value = column.relationMetadata.getEntityValue(subject.entity);
if (value !== null && value !== undefined)
return;
}
var normalizedValue = entityValue;
// normalize special values to make proper comparision
if (entityValue !== null && entityValue !== undefined) {
if (column.type === "date") {
normalizedValue = DateUtils.mixedDateToDateString(entityValue);
}
else if (column.type === "time") {
normalizedValue = DateUtils.mixedDateToTimeString(entityValue);
}
else if (column.type === "datetime" || column.type === Date) {
normalizedValue = DateUtils.mixedDateToUtcDatetimeString(entityValue);
databaseValue = DateUtils.mixedDateToUtcDatetimeString(databaseValue);
}
else if (column.type === "json" || column.type === "jsonb") {
normalizedValue = JSON.stringify(entityValue);
if (databaseValue !== null && databaseValue !== undefined)
databaseValue = JSON.stringify(databaseValue);
}
else if (column.type === "sample-array") {
normalizedValue = DateUtils.simpleArrayToString(entityValue);
databaseValue = DateUtils.simpleArrayToString(databaseValue);
}
}
// if value is not changed - then do nothing
if (normalizedValue === databaseValue)
return;
}
// find if there is already a column to be changed
var changeMap = subject.changeMaps.find(function (changeMap) { return changeMap.column === column; });
if (changeMap) { // and update its value if it was found
changeMap.value = entityValue;
}
else { // if it wasn't found add a new column for change
subject.changeMaps.push({
column: column,
value: entityValue
});
}
});
};
/**
* Difference columns of the owning one-to-one and many-to-one columns.
*/
SubjectChangedColumnsComputer.prototype.computeDiffRelationalColumns = function (allSubjects, subject) {
// if there is no persisted entity then nothing to compute changed in it
if (!subject.entity)
return;
subject.metadata.relationsWithJoinColumns.forEach(function (relation) {
// get the related entity from the persisted entity
var relatedEntity = relation.getEntityValue(subject.entity);
// we don't perform operation over undefined properties (but we DO need null properties!)
if (relatedEntity === undefined)
return;
// if there is no database entity then all relational columns are treated as new, e.g. changed
if (subject.databaseEntity) {
// here we cover two scenarios:
// 1. related entity can be another entity which is natural way
// 2. related entity can be just an entity id
// if relation entity is just a relation id set (for example post.tag = 1)
// then we create an id map from it to make a proper comparision
var relatedEntityRelationIdMap = relatedEntity;
if (relatedEntityRelationIdMap !== null && relatedEntityRelationIdMap instanceof Object)
relatedEntityRelationIdMap = relation.getRelationIdMap(relatedEntityRelationIdMap);
// get database related entity. Since loadRelationIds are used on databaseEntity
// related entity will contain only its relation ids
var databaseRelatedEntityRelationIdMap = relation.getEntityValue(subject.databaseEntity);
// if relation ids are equal then we don't need to update anything
var areRelatedIdsEqual = EntityMetadata.compareIds(relatedEntityRelationIdMap, databaseRelatedEntityRelationIdMap);
if (areRelatedIdsEqual)
return;
}
// if there is an inserted subject for the related entity of the persisted entity then use it as related entity
// this code is used for related entities without ids to be properly inserted (and then updated if needed)
var valueSubject = allSubjects.find(function (subject) { return subject.mustBeInserted && subject.entity === relatedEntity; });
if (valueSubject)
relatedEntity = valueSubject;
// find if there is already a relation to be changed
var changeMap = subject.changeMaps.find(function (changeMap) { return changeMap.relation === relation; });
if (changeMap) { // and update its value if it was found
changeMap.value = relatedEntity;
}
else { // if it wasn't found add a new relation for change
subject.changeMaps.push({
relation: relation,
value: relatedEntity
});
}
});
};
return SubjectChangedColumnsComputer;
}());
export { SubjectChangedColumnsComputer };
//# sourceMappingURL=SubjectChangedColumnsComputer.js.map