| 1 | 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{EntityMetadata} from \"../metadata/EntityMetadata\";\nimport {Connection} from \"../connection/Connection\";\nimport {RelationMetadata} from \"../metadata/RelationMetadata\";\nimport {QueryBuilderUtils} from \"./QueryBuilderUtils\";\nimport {QueryExpressionMap} from \"./QueryExpressionMap\";\nimport {Alias} from \"./Alias\";\nimport {ObjectUtils} from \"../util/ObjectUtils\";\n\n/**\n * Stores all join attributes which will be used to build a JOIN query.\n */\nexport class JoinAttribute {\n\n // -------------------------------------------------------------------------\n // Public Properties\n // -------------------------------------------------------------------------\n\n /**\n * Join direction.\n */\n direction: \"LEFT\"|\"INNER\";\n\n /**\n * Alias of the joined (destination) table.\n */\n alias: Alias;\n\n /**\n * Joined table, entity target, or relation in \"post.category\" format.\n */\n entityOrProperty: Function|string;\n\n /**\n * Extra condition applied to \"ON\" section of join.\n */\n condition?: string;\n\n /**\n * Property + alias of the object where to joined data should be mapped.\n */\n mapToProperty?: string;\n\n /**\n * Indicates if user maps one or many objects from the join.\n */\n isMappingMany?: boolean;\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(private connection: Connection,\n private queryExpressionMap: QueryExpressionMap,\n joinAttribute?: JoinAttribute) {\n ObjectUtils.assign(this, joinAttribute || {});\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n get isMany(): boolean {\n if (this.isMappingMany !== undefined)\n return this.isMappingMany;\n\n if (this.relation)\n return this.relation.isManyToMany || this.relation.isOneToMany;\n\n return false;\n }\n\n \n isSelectedCache: boolean;\n isSelectedEvalueated: boolean = false;\n /**\n * Indicates if this join is selected.\n */\n get isSelected(): boolean {\n if (!this.isSelectedEvalueated) {\n let getValue = () => {\n for (const select of this.queryExpressionMap.selects) {\n if (select.selection === this.alias.name)\n return true;\n\n if (this.metadata && !!this.metadata.columns.find(column => select.selection === this.alias.name + \".\" + column.propertyPath))\n return true;\n }\n\n return false;\n };\n this.isSelectedCache = getValue();\n this.isSelectedEvalueated = true;\n }\n return this.isSelectedCache;\n\n }\n\n /**\n * Name of the table which we should join.\n */\n get tablePath(): string {\n return this.metadata ? this.metadata.tablePath : this.entityOrProperty as string;\n }\n\n /**\n * Alias of the parent of this join.\n * For example, if we join (\"post.category\", \"categoryAlias\") then \"post\" is a parent alias.\n * This value is extracted from entityOrProperty value.\n * This is available when join was made using \"post.category\" syntax.\n */\n get parentAlias(): string|undefined {\n if (!QueryBuilderUtils.isAliasProperty(this.entityOrProperty))\n return undefined;\n\n return this.entityOrProperty.substr(0, this.entityOrProperty.indexOf(\".\"));\n }\n\n /**\n * Relation property name of the parent.\n * This is used to understand what is joined.\n * For example, if we join (\"post.category\", \"categoryAlias\") then \"category\" is a relation property.\n * This value is extracted from entityOrProperty value.\n * This is available when join was made using \"post.category\" syntax.\n */\n get relationPropertyPath(): string|undefined {\n if (!QueryBuilderUtils.isAliasProperty(this.entityOrProperty))\n return undefined;\n\n return this.entityOrProperty.substr(this.entityOrProperty.indexOf(\".\") + 1);\n }\n\n relationCache: RelationMetadata|undefined;\n relationEvalueated: boolean = false;\n /**\n * Relation of the parent.\n * This is used to understand what is joined.\n * This is available when join was made using \"post.category\" syntax.\n * Relation can be undefined if entityOrProperty is regular entity or custom table.\n */\n get relation(): RelationMetadata | undefined {\n if (!this.relationEvalueated) {\n let getValue = () => {\n if (!QueryBuilderUtils.isAliasProperty(this.entityOrProperty))\n return undefined;\n\n const relationOwnerSelection = this.queryExpressionMap.findAliasByName(this.parentAlias!);\n let relation = relationOwnerSelection.metadata.findRelationWithPropertyPath(this.relationPropertyPath!);\n\n if (relation) {\n return relation;\n }\n\n if (relationOwnerSelection.metadata.parentEntityMetadata) {\n relation = relationOwnerSelection.metadata.parentEntityMetadata.findRelationWithPropertyPath(this.relationPropertyPath!);\n if (relation) {\n return relation;\n }\n }\n\n throw new Error(`Relation with property path ${this.relationPropertyPath} in entity was not found.`);\n };\n this.relationCache = getValue.bind(this)();\n this.relationEvalueated = true;\n }\n return this.relationCache;\n }\n\n /**\n * Metadata of the joined entity.\n * If table without entity was joined, then it will return undefined.\n */\n get metadata(): EntityMetadata|undefined {\n\n // entityOrProperty is relation, e.g. \"post.category\"\n if (this.relation)\n return this.relation.inverseEntityMetadata;\n\n // entityOrProperty is Entity class\n if (this.connection.hasMetadata(this.entityOrProperty))\n return this.connection.getMetadata(this.entityOrProperty);\n\n return undefined;\n\n /*if (typeof this.entityOrProperty === \"string\") { // entityOrProperty is a custom table\n\n // first try to find entity with such name, this is needed when entity does not have a target class,\n // and its target is a string name (scenario when plain old javascript is used or entity schema is loaded from files)\n const metadata = this.connection.entityMetadatas.find(metadata => metadata.name === this.entityOrProperty);\n if (metadata)\n return metadata;\n\n // check if we have entity with such table name, and use its metadata if found\n return this.connection.entityMetadatas.find(metadata => metadata.tableName === this.entityOrProperty);\n }*/\n }\n\n /**\n * Generates alias of junction table, whose ids we get.\n */\n get junctionAlias(): string {\n if (!this.relation)\n throw new Error(`Cannot get junction table for join without relation.`);\n\n return this.relation.isOwning ? this.parentAlias + \"_\" + this.alias.name : this.alias.name + \"_\" + this.parentAlias;\n }\n\n get mapToPropertyParentAlias(): string|undefined {\n if (!this.mapToProperty)\n return undefined;\n\n return this.mapToProperty!.split(\".\")[0];\n }\n\n get mapToPropertyPropertyName(): string|undefined {\n if (!this.mapToProperty)\n return undefined;\n\n return this.mapToProperty!.split(\".\")[1];\n }\n\n}"],"sourceRoot":".."} |