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JunctionEntityMetadataBuilder.ts
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JunctionEntityMetadataBuilder.ts
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import {MysqlDriver} from "../driver/mysql/MysqlDriver";
import {ColumnMetadata} from "../metadata/ColumnMetadata";
import {Connection} from "../connection/Connection";
import {EntityMetadata} from "../metadata/EntityMetadata";
import {ForeignKeyMetadata} from "../metadata/ForeignKeyMetadata";
import {IndexMetadata} from "../metadata/IndexMetadata";
import {JoinTableMetadataArgs} from "../metadata-args/JoinTableMetadataArgs";
import {RelationMetadata} from "../metadata/RelationMetadata";
import {AuroraDataApiDriver} from "../driver/aurora-data-api/AuroraDataApiDriver";
/**
* Creates EntityMetadata for junction tables.
* Junction tables are tables generated by many-to-many relations.
*/
export class JunctionEntityMetadataBuilder {
// -------------------------------------------------------------------------
// Constructor
// -------------------------------------------------------------------------
constructor(private connection: Connection) {
}
// -------------------------------------------------------------------------
// Public Methods
// -------------------------------------------------------------------------
/**
* Builds EntityMetadata for the junction of the given many-to-many relation.
*/
build(relation: RelationMetadata, joinTable: JoinTableMetadataArgs): EntityMetadata {
const referencedColumns = this.collectReferencedColumns(relation, joinTable);
const inverseReferencedColumns = this.collectInverseReferencedColumns(relation, joinTable);
const joinTableName = joinTable.name || this.connection.namingStrategy.joinTableName(
relation.entityMetadata.tableNameWithoutPrefix,
relation.inverseEntityMetadata.tableNameWithoutPrefix,
relation.propertyPath,
relation.inverseRelation ? relation.inverseRelation.propertyName : ""
);
const entityMetadata = new EntityMetadata({
connection: this.connection,
args: {
target: "",
name: joinTableName,
type: "junction",
database: joinTable.database || relation.entityMetadata.database,
schema: joinTable.schema || relation.entityMetadata.schema,
}
});
entityMetadata.build();
// create original side junction columns
const junctionColumns = referencedColumns.map(referencedColumn => {
const joinColumn = joinTable.joinColumns ? joinTable.joinColumns.find(joinColumnArgs => {
return (!joinColumnArgs.referencedColumnName || joinColumnArgs.referencedColumnName === referencedColumn.propertyName) &&
!!joinColumnArgs.name;
}) : undefined;
const columnName = joinColumn && joinColumn.name ? joinColumn.name
: this.connection.namingStrategy.joinTableColumnName(relation.entityMetadata.tableNameWithoutPrefix, referencedColumn.propertyName, referencedColumn.databaseName);
return new ColumnMetadata({
connection: this.connection,
entityMetadata: entityMetadata,
referencedColumn: referencedColumn,
args: {
target: "",
mode: "virtual",
propertyName: columnName,
options: {
name: columnName,
length: !referencedColumn.length
&& (this.connection.driver instanceof MysqlDriver || this.connection.driver instanceof AuroraDataApiDriver)
&& (referencedColumn.generationStrategy === "uuid" || referencedColumn.type === "uuid")
? "36"
: referencedColumn.length, // fix https://github.com/typeorm/typeorm/issues/3604
width: referencedColumn.width,
type: referencedColumn.type,
precision: referencedColumn.precision,
scale: referencedColumn.scale,
charset: referencedColumn.charset,
collation: referencedColumn.collation,
zerofill: referencedColumn.zerofill,
unsigned: referencedColumn.zerofill ? true : referencedColumn.unsigned,
nullable: false,
primary: true,
}
}
});
});
// create inverse side junction columns
const inverseJunctionColumns = inverseReferencedColumns.map(inverseReferencedColumn => {
const joinColumn = joinTable.inverseJoinColumns ? joinTable.inverseJoinColumns.find(joinColumnArgs => {
return (!joinColumnArgs.referencedColumnName || joinColumnArgs.referencedColumnName === inverseReferencedColumn.propertyName) &&
!!joinColumnArgs.name;
}) : undefined;
const columnName = joinColumn && joinColumn.name ? joinColumn.name
: this.connection.namingStrategy.joinTableInverseColumnName(relation.inverseEntityMetadata.tableNameWithoutPrefix, inverseReferencedColumn.propertyName, inverseReferencedColumn.databaseName);
return new ColumnMetadata({
connection: this.connection,
entityMetadata: entityMetadata,
referencedColumn: inverseReferencedColumn,
args: {
target: "",
mode: "virtual",
propertyName: columnName,
options: {
length: !inverseReferencedColumn.length
&& (this.connection.driver instanceof MysqlDriver || this.connection.driver instanceof AuroraDataApiDriver)
&& (inverseReferencedColumn.generationStrategy === "uuid" || inverseReferencedColumn.type === "uuid")
? "36"
: inverseReferencedColumn.length, // fix https://github.com/typeorm/typeorm/issues/3604
width: inverseReferencedColumn.width, // fix https://github.com/typeorm/typeorm/issues/6442
type: inverseReferencedColumn.type,
precision: inverseReferencedColumn.precision,
scale: inverseReferencedColumn.scale,
charset: inverseReferencedColumn.charset,
collation: inverseReferencedColumn.collation,
zerofill: inverseReferencedColumn.zerofill,
unsigned: inverseReferencedColumn.zerofill ? true : inverseReferencedColumn.unsigned,
name: columnName,
nullable: false,
primary: true,
}
}
});
});
this.changeDuplicatedColumnNames(junctionColumns, inverseJunctionColumns);
// set junction table columns
entityMetadata.ownerColumns = junctionColumns;
entityMetadata.inverseColumns = inverseJunctionColumns;
entityMetadata.ownColumns = [...junctionColumns, ...inverseJunctionColumns];
entityMetadata.ownColumns.forEach(column => column.relationMetadata = relation);
// create junction table foreign keys
entityMetadata.foreignKeys = [
new ForeignKeyMetadata({
entityMetadata: entityMetadata,
referencedEntityMetadata: relation.entityMetadata,
columns: junctionColumns,
referencedColumns: referencedColumns,
onDelete: relation.onDelete || "CASCADE"
}),
new ForeignKeyMetadata({
entityMetadata: entityMetadata,
referencedEntityMetadata: relation.inverseEntityMetadata,
columns: inverseJunctionColumns,
referencedColumns: inverseReferencedColumns,
onDelete: relation.onDelete || "CASCADE"
}),
];
// create junction table indices
entityMetadata.ownIndices = [
new IndexMetadata({
entityMetadata: entityMetadata,
columns: junctionColumns,
args: {
target: entityMetadata.target,
synchronize: true
}
}),
new IndexMetadata({
entityMetadata: entityMetadata,
columns: inverseJunctionColumns,
args: {
target: entityMetadata.target,
synchronize: true
}
})
];
// finally return entity metadata
return entityMetadata;
}
// -------------------------------------------------------------------------
// Protected Methods
// -------------------------------------------------------------------------
/**
* Collects referenced columns from the given join column args.
*/
protected collectReferencedColumns(relation: RelationMetadata, joinTable: JoinTableMetadataArgs): ColumnMetadata[] {
const hasAnyReferencedColumnName = joinTable.joinColumns ? joinTable.joinColumns.find(joinColumn => !!joinColumn.referencedColumnName) : false;
if (!joinTable.joinColumns || (joinTable.joinColumns && !hasAnyReferencedColumnName)) {
return relation.entityMetadata.columns.filter(column => column.isPrimary);
} else {
return joinTable.joinColumns.map(joinColumn => {
const referencedColumn = relation.entityMetadata.columns.find(column => column.propertyName === joinColumn.referencedColumnName);
if (!referencedColumn)
throw new Error(`Referenced column ${joinColumn.referencedColumnName} was not found in entity ${relation.entityMetadata.name}`);
return referencedColumn;
});
}
}
/**
* Collects inverse referenced columns from the given join column args.
*/
protected collectInverseReferencedColumns(relation: RelationMetadata, joinTable: JoinTableMetadataArgs): ColumnMetadata[] {
const hasInverseJoinColumns = !!joinTable.inverseJoinColumns;
const hasAnyInverseReferencedColumnName = hasInverseJoinColumns ? joinTable.inverseJoinColumns!.find(joinColumn => !!joinColumn.referencedColumnName) : false;
if (!hasInverseJoinColumns || (hasInverseJoinColumns && !hasAnyInverseReferencedColumnName)) {
return relation.inverseEntityMetadata.primaryColumns;
} else {
return joinTable.inverseJoinColumns!.map(joinColumn => {
const referencedColumn = relation.inverseEntityMetadata.ownColumns.find(column => column.propertyName === joinColumn.referencedColumnName);
if (!referencedColumn)
throw new Error(`Referenced column ${joinColumn.referencedColumnName} was not found in entity ${relation.inverseEntityMetadata.name}`);
return referencedColumn;
});
}
}
protected changeDuplicatedColumnNames(junctionColumns: ColumnMetadata[], inverseJunctionColumns: ColumnMetadata[]) {
junctionColumns.forEach(junctionColumn => {
inverseJunctionColumns.forEach(inverseJunctionColumn => {
if (junctionColumn.givenDatabaseName === inverseJunctionColumn.givenDatabaseName) {
const junctionColumnName = this.connection.namingStrategy.joinTableColumnDuplicationPrefix(junctionColumn.propertyName, 1);
junctionColumn.propertyName = junctionColumnName;
junctionColumn.givenDatabaseName = junctionColumnName;
const inverseJunctionColumnName = this.connection.namingStrategy.joinTableColumnDuplicationPrefix(inverseJunctionColumn.propertyName, 2);
inverseJunctionColumn.propertyName = inverseJunctionColumnName;
inverseJunctionColumn.givenDatabaseName = inverseJunctionColumnName;
}
});
});
}
}