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{Subject} from \"../Subject\";\nimport {OrmUtils} from \"../../util/OrmUtils\";\nimport {ObjectLiteral} from \"../../common/ObjectLiteral\";\nimport {RelationMetadata} from \"../../metadata/RelationMetadata\";\n\n/**\n * Builds operations needs to be executed for one-to-one non-owner relations of the given subjects.\n *\n * by example: post contains one-to-one non-owner relation with category in the property called \"category\", e.g.\n * @OneToOne(type => Category, category => category.post) category: Category\n * If user sets a category into the post and saves post we need to bind them.\n * This operation requires updation of category table since its owner of the relation and contains a join column.\n *\n * note: this class shares lot of things with OneToManyUpdateBuilder, so when you change this class\n * make sure to reflect changes there as well.\n */\nexport class OneToOneInverseSideSubjectBuilder {\n\n // ---------------------------------------------------------------------\n // Constructor\n // ---------------------------------------------------------------------\n\n constructor(protected subjects: Subject[]) {\n }\n\n // ---------------------------------------------------------------------\n // Public Methods\n // ---------------------------------------------------------------------\n\n /**\n * Builds all required operations.\n */\n build(): void {\n this.subjects.forEach(subject => {\n subject.metadata.oneToOneRelations.forEach(relation => {\n\n // we don't need owning relations, this operation is only for inverse side of one-to-one relations\n // skip relations for which persistence is disabled\n if (relation.isOwning || relation.persistenceEnabled === false)\n return;\n\n this.buildForSubjectRelation(subject, relation);\n });\n });\n }\n\n // ---------------------------------------------------------------------\n // Protected Methods\n // ---------------------------------------------------------------------\n\n /**\n * Builds operations for a given subject and relation.\n *\n * by example: subject is \"post\" entity we are saving here and relation is \"category\" inside it here.\n */\n protected buildForSubjectRelation(subject: Subject, relation: RelationMetadata) {\n\n // prepare objects (relation id map) for the database entity\n // note: subject.databaseEntity contains relation with loaded relation id only (id map)\n // by example: since subject is a post, we are expecting to get post's category saved in the database here,\n // particularly its relation id, e.g. category id stored in the database\n let relatedEntityDatabaseRelationId: ObjectLiteral|undefined = undefined;\n if (subject.databaseEntity) // related entity in the database can exist only if this entity (post) is saved\n relatedEntityDatabaseRelationId = relation.getEntityValue(subject.databaseEntity);\n\n // get related entities of persisted entity\n // by example: get category from the passed to persist post entity\n let relatedEntity: ObjectLiteral|null = relation.getEntityValue(subject.entity!); // by example: relatedEntity is a category here\n if (relatedEntity === undefined) // if relation is undefined then nothing to update\n return;\n\n // if related entity is null then we need to check if there a bind in the database and unset it\n // if there is no bind in the entity then we don't need to do anything\n // by example: if post.category = null and category has this post in the database then we unset it\n if (relatedEntity === null) {\n\n // it makes sense to update database only there is a previously set value in the database\n if (relatedEntityDatabaseRelationId) {\n // todo: probably we can improve this in the future by finding entity with column those values,\n // todo: maybe it was already in persistence process. This is possible due to unique requirements of join columns\n // we create a new subject which operations will be executed in subject operation executor\n\n const removedRelatedEntitySubject = new Subject({\n metadata: relation.inverseEntityMetadata,\n parentSubject: subject,\n canBeUpdated: true,\n identifier: relatedEntityDatabaseRelationId,\n changeMaps: [{\n relation: relation.inverseRelation!,\n value: null\n }]\n });\n this.subjects.push(removedRelatedEntitySubject);\n }\n\n return;\n } // else means entity is bind in the database\n\n // extract only relation id from the related entities, since we only need it for comparision\n // by example: extract from category only relation id (category id, or let's say category title, depend on join column options)\n let relationIdMap = relation.inverseEntityMetadata!.getEntityIdMap(relatedEntity); // by example: relationIdMap is category.id map here, e.g. { id: ... }\n\n // try to find a subject of this related entity, maybe it was loaded or was marked for persistence\n let relatedEntitySubject = this.subjects.find(operateSubject => {\n return !!operateSubject.entity && operateSubject.entity === relatedEntity;\n });\n\n // if subject with entity was found take subject identifier as relation id map since it may contain extra properties resolved\n if (relatedEntitySubject)\n relationIdMap = relatedEntitySubject.identifier;\n\n // if relationIdMap is undefined then it means user binds object which is not saved in the database yet\n // by example: if post contains category which does not have id(s) yet (because its a new category)\n // it means its always newly inserted and relation update operation always must be created for it\n // it does not make sense to perform difference operation for it for both add and remove actions\n if (!relationIdMap) {\n\n // we decided to remove this error because it brings complications when saving object with non-saved entities\n // if related entity does not have a subject then it means user tries to bind entity which wasn't saved\n // in this persistence because he didn't pass this entity for save or he did not set cascades\n // but without entity being inserted we cannot bind it in the relation operation, so we throw an exception here\n // if (!relatedEntitySubject)\n // throw new Error(`One-to-one inverse relation \"${relation.entityMetadata.name}.${relation.propertyPath}\" contains ` +\n // `entity which does not exist in the database yet, thus cannot be bind in the database. ` +\n // `Please setup cascade insertion or save entity before binding it.`);\n if (!relatedEntitySubject)\n return;\n\n // okay, so related subject exist and its marked for insertion, then add a new change map\n // by example: this will tell category to insert into its post relation our post we are working with\n // relatedEntitySubject is newly inserted CategorySubject\n // relation.inverseRelation is OneToOne owner relation inside Category\n // subject is Post needs to be inserted into Category\n relatedEntitySubject.changeMaps.push({\n relation: relation.inverseRelation!,\n value: subject\n });\n }\n\n // check if this binding really exist in the database\n // by example: find our post if its already bind to category in the database and its not equal to what user tries to set\n const areRelatedIdEqualWithDatabase = relatedEntityDatabaseRelationId && OrmUtils.deepCompare(relationIdMap, relatedEntityDatabaseRelationId);\n\n // if they aren't equal it means its a new relation and we need to \"bind\" them\n // by example: this will tell category to insert into its post relation our post we are working with\n // relatedEntitySubject is newly inserted CategorySubject\n // relation.inverseRelation is ManyToOne relation inside Category\n // subject is Post needs to be inserted into Category\n if (!areRelatedIdEqualWithDatabase) {\n\n // if there is no relatedEntitySubject then it means \"category\" wasn't persisted,\n // but since we are going to update \"category\" table (since its an owning side of relation with join column)\n // we create a new subject here:\n if (!relatedEntitySubject) {\n relatedEntitySubject = new Subject({\n metadata: relation.inverseEntityMetadata,\n canBeUpdated: true,\n identifier: relationIdMap\n });\n this.subjects.push(relatedEntitySubject);\n }\n\n relatedEntitySubject.changeMaps.push({\n relation: relation.inverseRelation!,\n value: subject\n });\n }\n }\n\n}"],"sourceRoot":"../.."}
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