fb802ad687
- to_many relationships are now cached on the table data structure - to_many relationships now know if any columns involved are nullable
88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
package bdb
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// ToManyRelationship describes a relationship between two tables where the
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// local table has no id, and the foreign table has an id that matches a column
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// in the local table.
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type ToManyRelationship struct {
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Column string
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Nullable bool
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ForeignTable string
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ForeignColumn string
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ForeignColumnNullable bool
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ToJoinTable bool
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JoinTable string
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JoinLocalColumn string
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JoinLocalColumnNullable bool
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JoinForeignColumn string
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JoinForeignColumnNullable bool
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}
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// ToManyRelationships relationship lookups
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// Input should be the sql name of a table like: videos
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func ToManyRelationships(table string, tables []Table) []ToManyRelationship {
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localTable := GetTable(tables, table)
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return toManyRelationships(localTable, tables)
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}
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func toManyRelationships(table Table, tables []Table) []ToManyRelationship {
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var relationships []ToManyRelationship
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for _, t := range tables {
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if t.Name == table.Name {
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continue
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}
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for _, f := range t.FKeys {
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if f.ForeignTable != table.Name {
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continue
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}
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relationships = append(relationships, buildRelationship(table, f, t, tables))
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}
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}
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return relationships
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}
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func buildRelationship(localTable Table, foreignKey ForeignKey, foreignTable Table, tables []Table) ToManyRelationship {
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if !foreignTable.IsJoinTable {
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col := localTable.GetColumn(foreignKey.ForeignColumn)
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return ToManyRelationship{
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Column: foreignKey.ForeignColumn,
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Nullable: col.Nullable,
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ForeignTable: foreignTable.Name,
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ForeignColumn: foreignKey.Column,
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ForeignColumnNullable: foreignKey.Nullable,
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ToJoinTable: false,
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}
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}
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col := foreignTable.GetColumn(foreignKey.Column)
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relationship := ToManyRelationship{
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Column: foreignKey.ForeignColumn,
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Nullable: col.Nullable,
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ToJoinTable: true,
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JoinTable: foreignTable.Name,
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}
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for _, fk := range foreignTable.FKeys {
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if fk.ForeignTable != localTable.Name {
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relationship.JoinForeignColumn = fk.Column
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relationship.JoinForeignColumnNullable = fk.Nullable
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foreignTable := GetTable(tables, fk.ForeignTable)
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foreignCol := foreignTable.GetColumn(fk.ForeignColumn)
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relationship.ForeignTable = fk.ForeignTable
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relationship.ForeignColumn = fk.ForeignColumn
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relationship.ForeignColumnNullable = foreignCol.Nullable
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} else {
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relationship.JoinLocalColumn = fk.Column
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relationship.JoinLocalColumnNullable = fk.Nullable
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}
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}
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return relationship
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}
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