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    Class OperationNodeTransformer

    Transforms an operation node tree into another one.

    Kysely queries are expressed internally as a tree of objects (operation nodes). OperationNodeTransformer takes such a tree as its input and returns a transformed deep copy of it. By default the OperationNodeTransformer does nothing. You need to override one or more methods to make it do something.

    There's a method for each node type. For example if you'd like to convert each identifier (table name, column name, alias etc.) from camelCase to snake_case, you'd do something like this:

    import { type IdentifierNode, OperationNodeTransformer } from 'kysely'
    import snakeCase from 'lodash/snakeCase'

    class CamelCaseTransformer extends OperationNodeTransformer {
      override transformIdentifier(node: IdentifierNode): IdentifierNode {
        node = super.transformIdentifier(node)

        return {
          ...node,
          name: snakeCase(node.name),
        }
      }
    }

    const transformer = new CamelCaseTransformer()

    const query = db.selectFrom('person').select(['first_name', 'last_name'])

    const tree = transformer.transformNode(query.toOperationNode())
    Index

    Constructors

    constructor

    Properties

    nodeStack

    Methods

    transformAddColumn transformAddConstraint transformAddIndex transformAggregateFunction transformAlias transformAlterColumn transformAlterTable transformAnd transformBinaryOperation transformCase transformCast transformCheckConstraint transformCollate transformColumn transformColumnDefinition transformColumnUpdate transformCommonTableExpression transformCommonTableExpressionName transformCreateIndex transformCreateSchema transformCreateTable transformCreateType transformCreateView transformDataType transformDefaultInsertValue transformDefaultValue transformDeleteQuery transformDropColumn transformDropConstraint transformDropIndex transformDropSchema transformDropTable transformDropType transformDropView transformExplain transformFetch transformForeignKeyConstraint transformFrom transformFunction transformGenerated transformGroupBy transformGroupByItem transformHaving transformIdentifier transformInsertQuery transformJoin transformJSONOperatorChain transformJSONPath transformJSONPathLeg transformJSONReference transformLimit transformList transformMatched transformMergeQuery transformModifyColumn transformNode transformNodeImpl transformNodeList transformOffset transformOn transformOnConflict transformOnDuplicateKey transformOperator transformOr transformOrAction transformOrderBy transformOrderByItem transformOutput transformOver transformParens transformPartitionBy transformPartitionByItem transformPrimaryKeyConstraint transformPrimitiveValueList transformRaw transformReference transformReferences transformRefreshMaterializedView transformRenameColumn transformRenameConstraint transformReturning transformSchemableIdentifier transformSelectAll transformSelection transformSelectModifier transformSelectQuery transformSetOperation transformTable transformTop transformTuple transformUnaryOperation transformUniqueConstraint transformUpdateQuery transformUsing transformValue transformValueList transformValues transformWhen transformWhere transformWith

    Constructors

    Properties

    nodeStack: OperationNode[] = []

    Methods

    Settings

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    Constructors
    Properties
    Methods
    transformAddColumntransformAddConstrainttransformAddIndextransformAggregateFunctiontransformAliastransformAlterColumntransformAlterTabletransformAndtransformBinaryOperationtransformCasetransformCasttransformCheckConstrainttransformCollatetransformColumntransformColumnDefinitiontransformColumnUpdatetransformCommonTableExpressiontransformCommonTableExpressionNametransformCreateIndextransformCreateSchematransformCreateTabletransformCreateTypetransformCreateViewtransformDataTypetransformDefaultInsertValuetransformDefaultValuetransformDeleteQuerytransformDropColumntransformDropConstrainttransformDropIndextransformDropSchematransformDropTabletransformDropTypetransformDropViewtransformExplaintransformFetchtransformForeignKeyConstrainttransformFromtransformFunctiontransformGeneratedtransformGroupBytransformGroupByItemtransformHavingtransformIdentifiertransformInsertQuerytransformJointransformJSONOperatorChaintransformJSONPathtransformJSONPathLegtransformJSONReferencetransformLimittransformListtransformMatchedtransformMergeQuerytransformModifyColumntransformNodetransformNodeImpltransformNodeListtransformOffsettransformOntransformOnConflicttransformOnDuplicateKeytransformOperatortransformOrtransformOrActiontransformOrderBytransformOrderByItemtransformOutputtransformOvertransformParenstransformPartitionBytransformPartitionByItemtransformPrimaryKeyConstrainttransformPrimitiveValueListtransformRawtransformReferencetransformReferencestransformRefreshMaterializedViewtransformRenameColumntransformRenameConstrainttransformReturningtransformSchemableIdentifiertransformSelectAlltransformSelectiontransformSelectModifiertransformSelectQuerytransformSetOperationtransformTabletransformToptransformTupletransformUnaryOperationtransformUniqueConstrainttransformUpdateQuerytransformUsingtransformValuetransformValueListtransformValuestransformWhentransformWheretransformWith