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{ObjectLiteral} from \"../common/ObjectLiteral\";\nimport {EntityMetadata} from \"../metadata/EntityMetadata\";\nimport {SubjectChangeMap} from \"./SubjectChangeMap\";\nimport {OrmUtils} from \"../util/OrmUtils\";\nimport {RelationMetadata} from \"../metadata/RelationMetadata\";\nimport {ColumnMetadata} from \"../metadata/ColumnMetadata\";\n\n/**\n * Subject is a subject of persistence.\n * It holds information about each entity that needs to be persisted:\n * - what entity should be persisted\n * - what is database representation of the persisted entity\n * - what entity metadata of the persisted entity\n * - what is allowed to with persisted entity (insert/update/remove)\n *\n * Having this collection of subjects we can perform database queries.\n */\nexport class Subject {\n\n // -------------------------------------------------------------------------\n // Properties\n // -------------------------------------------------------------------------\n\n /**\n * Entity metadata of the subject entity.\n */\n metadata: EntityMetadata;\n\n /**\n * Subject identifier.\n * This identifier is not limited to table entity primary columns.\n * This can be entity id or ids as well as some unique entity properties, like name or title.\n * Insert / Update / Remove operation will be executed by a given identifier.\n */\n identifier: ObjectLiteral|undefined = undefined;\n\n /**\n * Copy of entity but with relational ids fulfilled.\n */\n entityWithFulfilledIds: ObjectLiteral|undefined = undefined;\n\n /**\n * If subject was created by cascades this property will contain subject\n * from where this subject was created.\n */\n parentSubject?: Subject;\n\n /**\n * Gets entity sent to the persistence (e.g. changed entity).\n * If entity is not set then this subject is created only for the entity loaded from the database,\n * or this subject is used for the junction operation (junction operations are relying only on identifier).\n */\n entity?: ObjectLiteral;\n\n /**\n * Database entity.\n * THIS IS NOT RAW ENTITY DATA, its a real entity.\n */\n databaseEntity?: ObjectLiteral;\n\n /**\n * Indicates if database entity was loaded.\n * No matter if it was found or not, it indicates the fact of loading.\n */\n databaseEntityLoaded: boolean = false;\n\n /**\n * Changes needs to be applied in the database for the given subject.\n */\n changeMaps: SubjectChangeMap[] = [];\n\n /**\n * Generated values returned by a database (for example generated id or default values).\n * Used in insert and update operations.\n * Has entity-like structure (not just column database name and values).\n */\n generatedMap?: ObjectLiteral;\n\n /**\n * Inserted values with updated values of special and default columns.\n * Has entity-like structure (not just column database name and values).\n */\n insertedValueSet?: ObjectLiteral;\n\n /**\n * Indicates if this subject can be inserted into the database.\n * This means that this subject either is newly persisted, either can be inserted by cascades.\n */\n canBeInserted: boolean = false;\n\n /**\n * Indicates if this subject can be updated in the database.\n * This means that this subject either was persisted, either can be updated by cascades.\n */\n canBeUpdated: boolean = false;\n\n /**\n * Indicates if this subject MUST be removed from the database.\n * This means that this subject either was removed, either was removed by cascades.\n */\n mustBeRemoved: boolean = false;\n\n /**\n * Relations updated by the change maps.\n */\n updatedRelationMaps: { relation: RelationMetadata, value: ObjectLiteral }[] = [];\n\n /**\n * List of updated columns\n */\n diffColumns: ColumnMetadata[] = [];\n\n /**\n * List of updated relations\n */\n diffRelations: RelationMetadata[] = [];\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(options: {\n metadata: EntityMetadata,\n parentSubject?: Subject,\n entity?: ObjectLiteral,\n canBeInserted?: boolean,\n canBeUpdated?: boolean,\n mustBeRemoved?: boolean,\n identifier?: ObjectLiteral,\n changeMaps?: SubjectChangeMap[]\n }) {\n this.metadata = options.metadata;\n this.entity = options.entity;\n this.parentSubject = options.parentSubject;\n if (options.canBeInserted !== undefined)\n this.canBeInserted = options.canBeInserted;\n if (options.canBeUpdated !== undefined)\n this.canBeUpdated = options.canBeUpdated;\n if (options.mustBeRemoved !== undefined)\n this.mustBeRemoved = options.mustBeRemoved;\n if (options.identifier !== undefined)\n this.identifier = options.identifier;\n if (options.changeMaps !== undefined)\n this.changeMaps.push(...options.changeMaps);\n\n this.recompute();\n }\n\n // -------------------------------------------------------------------------\n // Accessors\n // -------------------------------------------------------------------------\n\n /**\n * Checks if this subject must be inserted into the database.\n * Subject can be inserted into the database if it is allowed to be inserted (explicitly persisted or by cascades)\n * and if it does not have database entity set.\n */\n get mustBeInserted() {\n return this.canBeInserted && !this.databaseEntity;\n }\n\n /**\n * Checks if this subject must be updated into the database.\n * Subject can be updated in the database if it is allowed to be updated (explicitly persisted or by cascades)\n * and if it does have differentiated columns or relations.\n */\n get mustBeUpdated() {\n return this.canBeUpdated &&\n this.identifier &&\n (this.databaseEntityLoaded === false || (this.databaseEntityLoaded && this.databaseEntity)) &&\n // ((this.entity && this.databaseEntity) || (!this.entity && !this.databaseEntity)) &&\n this.changeMaps.length > 0;\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Creates a value set needs to be inserted / updated in the database.\n * Value set is based on the entity and change maps of the subject.\n * Important note: this method pops data from this subject's change maps.\n */\n createValueSetAndPopChangeMap(): ObjectLiteral {\n const changeMapsWithoutValues: SubjectChangeMap[] = [];\n const changeSet = this.changeMaps.reduce((updateMap, changeMap) => {\n let value = changeMap.value;\n if (value instanceof Subject) {\n\n // referenced columns can refer on values both which were just inserted and which were present in the model\n // if entity was just inserted valueSets must contain all values from the entity and values just inserted in the database\n // so, here we check if we have a value set then we simply use it as value to get our reference column values\n // otherwise simply use an entity which cannot be just inserted at the moment and have all necessary data\n value = value.insertedValueSet ? value.insertedValueSet : value.entity;\n }\n // value = changeMap.valueFactory ? changeMap.valueFactory(value) : changeMap.column.createValueMap(value);\n\n let valueMap: ObjectLiteral|undefined;\n if (this.metadata.isJunction && changeMap.column) {\n valueMap = changeMap.column.createValueMap(changeMap.column.referencedColumn!.getEntityValue(value));\n\n } else if (changeMap.column) {\n valueMap = changeMap.column.createValueMap(value);\n\n } else if (changeMap.relation) {\n\n // value can be a related object, for example: post.question = { id: 1 }\n // or value can be a null or direct relation id, e.g. post.question = 1\n // if its a direction relation id then we just set it to the valueMap,\n // however if its an object then we need to extract its relation id map and set it to the valueMap\n if (value instanceof Object) {\n\n // get relation id, e.g. referenced column name and its value,\n // for example: { id: 1 } which then will be set to relation, e.g. post.category = { id: 1 }\n const relationId = changeMap.relation!.getRelationIdMap(value);\n\n // but relation id can be empty, for example in the case when you insert a new post with category\n // and both post and category are newly inserted objects (by cascades) and in this case category will not have id\n // this means we need to insert post without question id and update post's questionId once question be inserted\n // that's why we create a new changeMap operation for future updation of the post entity\n if (relationId === undefined) {\n changeMapsWithoutValues.push(changeMap);\n this.canBeUpdated = true;\n return updateMap;\n }\n valueMap = changeMap.relation!.createValueMap(relationId);\n this.updatedRelationMaps.push({ relation: changeMap.relation, value: relationId });\n\n } else { // value can be \"null\" or direct relation id here\n valueMap = changeMap.relation!.createValueMap(value);\n this.updatedRelationMaps.push({ relation: changeMap.relation, value: value });\n }\n }\n\n OrmUtils.mergeDeep(updateMap, valueMap);\n return updateMap;\n }, {} as ObjectLiteral);\n this.changeMaps = changeMapsWithoutValues;\n return changeSet;\n }\n\n /**\n * Recomputes entityWithFulfilledIds and identifier when entity changes.\n */\n recompute(): void {\n\n if (this.entity) {\n this.entityWithFulfilledIds = Object.assign({}, this.entity);\n if (this.parentSubject) {\n this.metadata.primaryColumns.forEach(primaryColumn => {\n if (primaryColumn.relationMetadata && primaryColumn.relationMetadata.inverseEntityMetadata === this.parentSubject!.metadata) {\n primaryColumn.setEntityValue(this.entityWithFulfilledIds!, this.parentSubject!.entity);\n }\n });\n }\n this.identifier = this.metadata.getEntityIdMap(this.entityWithFulfilledIds);\n\n } else if (this.databaseEntity) {\n this.identifier = this.metadata.getEntityIdMap(this.databaseEntity);\n }\n }\n\n}\n"],"sourceRoot":".."} |