Deprecate object metadata maps in favor of flat entities (#16080)

## Context
Deprecating the old objectMetadataMap type in favour of split flat
entities to match with our new caching.
In the long run, trying to achieve:
- Better performance through caching
- Consistent data access patterns across the codebase
- Reduced database queries

Now that everything is based on flat entities, which are cached, we can
finish the refactoring of workspace context cache which should already
improve performances.
Then the last step will be to consume that new cache in the new global
datasource to get rid of the many workspace datasources stored in the
server

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/compute-field-input-type-options.util.ts

@@ -2,15 +2,15 @@ import { FieldMetadataType } from 'twenty-shared/types';
 
 import { GqlInputTypeDefinitionKind } from 'src/engine/api/graphql/workspace-schema-builder/enums/gql-input-type-definition-kind.enum';
 import { type TypeOptions } from 'src/engine/api/graphql/workspace-schema-builder/services/type-mapper.service';
-import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 
-export const computeFieldInputTypeOptions = <T extends FieldMetadataType>(
-  fieldMetadata: FieldMetadataEntity<T>,
+export const computeFieldInputTypeOptions = (
+  fieldMetadata: FlatFieldMetadata,
   kind: GqlInputTypeDefinitionKind,
 ): TypeOptions => {
   return {
     nullable: fieldMetadata.isNullable ?? undefined,
-    defaultValue: fieldMetadata.defaultValue,
+    defaultValue: fieldMetadata.defaultValue ?? undefined,
     isArray:
       kind !== GqlInputTypeDefinitionKind.Filter &&
       fieldMetadata.type === FieldMetadataType.MULTI_SELECT,

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/extract-graphql-relation-field-names.util.ts

@@ -1,13 +1,14 @@
 import { type FieldMetadataType } from 'twenty-shared/types';
 
-import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 
 export const extractGraphQLRelationFieldNames = (
-  fieldMetadata: FieldMetadataEntity<
+  fieldMetadata: FlatFieldMetadata<
     FieldMetadataType.RELATION | FieldMetadataType.MORPH_RELATION
   >,
 ) => {
-  const joinColumnName = fieldMetadata.settings?.joinColumnName;
+  const settings = fieldMetadata.settings;
+  const joinColumnName = settings?.joinColumnName;
 
   if (!joinColumnName) {
     throw new Error('Join column name is not defined');

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/get-available-aggregations-from-object-fields.util.ts

@@ -6,7 +6,7 @@ import { FieldMetadataType } from 'twenty-shared/types';
 import { capitalize, isFieldMetadataDateKind } from 'twenty-shared/utils';
 
 import { AggregateOperations } from 'src/engine/api/graphql/graphql-query-runner/constants/aggregate-operations.constant';
-import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { getSubfieldsForAggregateOperation } from 'src/engine/twenty-orm/utils/get-subfields-for-aggregate-operation.util';
 
 export type AggregationField = {
@@ -20,7 +20,7 @@ export type AggregationField = {
 };
 
 export const getAvailableAggregationsFromObjectFields = (
-  fields: FieldMetadataEntity[],
+  fields: FlatFieldMetadata[],
 ): Record<string, AggregationField> => {
   return fields.reduce<Record<string, AggregationField>>(
     (acc, field) => {

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/get-flat-fields-for-flat-object-metadata.util.ts

@@ -0,0 +1,14 @@
+import { isDefined } from 'twenty-shared/utils';
+
+import { type FlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-maps.type';
+import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
+import { type FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
+
+export const getFlatFieldsFromFlatObjectMetadata = (
+  flatObjectMetadata: FlatObjectMetadata,
+  flatFieldMetadataMaps: FlatEntityMaps<FlatFieldMetadata>,
+): FlatFieldMetadata[] => {
+  return flatObjectMetadata.fieldMetadataIds
+    .map((fieldId) => flatFieldMetadataMaps.byId[fieldId])
+    .filter(isDefined);
+};

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/object-contains-morph-relation-field.util.ts

@@ -1,10 +0,0 @@
-import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
-import { isMorphRelationFieldMetadataType } from 'src/engine/utils/is-morph-relation-field-metadata-type.util';
-
-export const objectContainsMorphRelationField = (
-  objectMetadata: ObjectMetadataEntity,
-): boolean => {
-  return objectMetadata.fields.some((field) =>
-    isMorphRelationFieldMetadataType(field.type),
-  );
-};

packages/twenty-server/src/engine/api/graphql/workspace-schema-builder/utils/object-contains-relation-field.ts

@@ -1,10 +0,0 @@
-import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
-import { isMorphOrRelationFieldMetadataType } from 'src/engine/utils/is-morph-or-relation-field-metadata-type.util';
-
-export const objectContainsRelationField = (
-  objectMetadata: ObjectMetadataEntity,
-): boolean => {
-  return objectMetadata.fields.some((field) =>
-    isMorphOrRelationFieldMetadataType(field.type),
-  );
-};