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{MysqlDriver} from \"../driver/mysql/MysqlDriver\";\nimport {ColumnMetadata} from \"../metadata/ColumnMetadata\";\nimport {UniqueMetadata} from \"../metadata/UniqueMetadata\";\nimport {ForeignKeyMetadata} from \"../metadata/ForeignKeyMetadata\";\nimport {RelationMetadata} from \"../metadata/RelationMetadata\";\nimport {JoinColumnMetadataArgs} from \"../metadata-args/JoinColumnMetadataArgs\";\nimport {Connection} from \"../connection/Connection\";\nimport {OracleDriver} from \"../driver/oracle/OracleDriver\";\n\n/**\n * Builds join column for the many-to-one and one-to-one owner relations.\n *\n * Cases it should cover:\n * 1. when join column is set with custom name and without referenced column name\n * we need automatically set referenced column name - primary ids by default\n * @JoinColumn({ name: \"custom_name\" })\n *\n * 2. when join column is set with only referenced column name\n * we need automatically set join column name - relation name + referenced column name\n * @JoinColumn({ referencedColumnName: \"title\" })\n *\n * 3. when join column is set without both referenced column name and join column name\n * we need to automatically set both of them\n * @JoinColumn()\n *\n * 4. when join column is not set at all (as in case of @ManyToOne relation)\n * we need to create join column for it with proper referenced column name and join column name\n *\n * 5. when multiple join columns set none of referencedColumnName and name can be optional\n * both options are required\n * @JoinColumn([\n * { name: \"category_title\", referencedColumnName: \"type\" },\n * { name: \"category_title\", referencedColumnName: \"name\" },\n * ])\n *\n * Since for many-to-one relations having JoinColumn decorator is not required,\n * we need to go thought each many-to-one relation without join column decorator set\n * and create join column metadata args for them.\n */\nexport class RelationJoinColumnBuilder {\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(private connection: Connection) {\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Builds a foreign key of the many-to-one or one-to-one owner relations.\n */\n build(joinColumns: JoinColumnMetadataArgs[], relation: RelationMetadata): {\n foreignKey: ForeignKeyMetadata|undefined,\n uniqueConstraint: UniqueMetadata|undefined,\n } {\n const referencedColumns = this.collectReferencedColumns(joinColumns, relation);\n if (!referencedColumns.length)\n return { foreignKey: undefined, uniqueConstraint: undefined }; // this case is possible only for one-to-one non owning side\n\n const columns = this.collectColumns(joinColumns, relation, referencedColumns);\n const foreignKey = new ForeignKeyMetadata({\n entityMetadata: relation.entityMetadata,\n referencedEntityMetadata: relation.inverseEntityMetadata,\n namingStrategy: this.connection.namingStrategy,\n columns: columns,\n referencedColumns: referencedColumns,\n onDelete: relation.onDelete,\n onUpdate: relation.onUpdate,\n deferrable: relation.deferrable,\n });\n\n // Oracle does not allow both primary and unique constraints on the same column\n if (this.connection.driver instanceof OracleDriver && columns.every(column => column.isPrimary))\n return { foreignKey, uniqueConstraint: undefined };\n\n // CockroachDB requires UNIQUE constraints on referenced columns\n if (referencedColumns.length > 0 && relation.isOneToOne) {\n const uniqueConstraint = new UniqueMetadata({\n entityMetadata: relation.entityMetadata,\n columns: foreignKey.columns,\n args: {\n name: this.connection.namingStrategy.relationConstraintName(relation.entityMetadata.tablePath, foreignKey.columns.map(c => c.databaseName)),\n target: relation.entityMetadata.target,\n }\n });\n uniqueConstraint.build(this.connection.namingStrategy);\n return {foreignKey, uniqueConstraint};\n }\n\n return { foreignKey, uniqueConstraint: undefined };\n }\n // -------------------------------------------------------------------------\n // Protected Methods\n // -------------------------------------------------------------------------\n\n /**\n * Collects referenced columns from the given join column args.\n */\n protected collectReferencedColumns(joinColumns: JoinColumnMetadataArgs[], relation: RelationMetadata): ColumnMetadata[] {\n const hasAnyReferencedColumnName = joinColumns.find(joinColumnArgs => !!joinColumnArgs.referencedColumnName);\n const manyToOneWithoutJoinColumn = joinColumns.length === 0 && relation.isManyToOne;\n const hasJoinColumnWithoutAnyReferencedColumnName = joinColumns.length > 0 && !hasAnyReferencedColumnName;\n\n if (manyToOneWithoutJoinColumn || hasJoinColumnWithoutAnyReferencedColumnName) { // covers case3 and case1\n return relation.inverseEntityMetadata.primaryColumns;\n\n } else { // cases with referenced columns defined\n return joinColumns.map(joinColumn => {\n const referencedColumn = relation.inverseEntityMetadata.ownColumns.find(column => column.propertyName === joinColumn.referencedColumnName); // todo: can we also search in relations?\n if (!referencedColumn)\n throw new Error(`Referenced column ${joinColumn.referencedColumnName} was not found in entity ${relation.inverseEntityMetadata.name}`);\n\n return referencedColumn;\n });\n }\n }\n\n /**\n * Collects columns from the given join column args.\n */\n private collectColumns(joinColumns: JoinColumnMetadataArgs[], relation: RelationMetadata, referencedColumns: ColumnMetadata[]): ColumnMetadata[] {\n return referencedColumns.map(referencedColumn => {\n\n // in the case if relation has join column with only name set we need this check\n const joinColumnMetadataArg = joinColumns.find(joinColumn => {\n return (!joinColumn.referencedColumnName || joinColumn.referencedColumnName === referencedColumn.propertyName) &&\n !!joinColumn.name;\n });\n const joinColumnName = joinColumnMetadataArg ? joinColumnMetadataArg.name : this.connection.namingStrategy.joinColumnName(relation.propertyName, referencedColumn.propertyName);\n\n let relationalColumn = relation.entityMetadata.ownColumns.find(column => column.databaseName === joinColumnName);\n if (!relationalColumn) {\n relationalColumn = new ColumnMetadata({\n connection: this.connection,\n entityMetadata: relation.entityMetadata,\n args: {\n target: \"\",\n mode: \"virtual\",\n propertyName: relation.propertyName,\n options: {\n name: joinColumnName,\n type: referencedColumn.type,\n length: !referencedColumn.length\n && (this.connection.driver instanceof MysqlDriver)\n && (referencedColumn.generationStrategy === \"uuid\" || referencedColumn.type === \"uuid\")\n ? \"36\"\n : referencedColumn.length, // fix https://github.com/typeorm/typeorm/issues/3604\n width: referencedColumn.width,\n charset: referencedColumn.charset,\n collation: referencedColumn.collation,\n precision: referencedColumn.precision,\n scale: referencedColumn.scale,\n zerofill: referencedColumn.zerofill,\n unsigned: referencedColumn.unsigned,\n comment: referencedColumn.comment,\n primary: relation.isPrimary,\n nullable: relation.isNullable\n }\n }\n });\n relation.entityMetadata.registerColumn(relationalColumn);\n }\n relationalColumn.referencedColumn = referencedColumn; // its important to set it here because we need to set referenced column for user defined join column\n relationalColumn.type = referencedColumn.type; // also since types of relational column and join column must be equal we override user defined column type\n relationalColumn.relationMetadata = relation;\n relationalColumn.build(this.connection);\n return relationalColumn;\n });\n }\n}\n"],"sourceRoot":".."}
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