Allow input and display of floats for Number fields (#7340)

### Description

- We added a decimal field for a Number Field type in the settings
- We updated the Number Field type create a form with decimals input
- We are not implementing the dropdown present on the Figma because it
seems not related

### Demo


<https://www.loom.com/share/18a8d4b712a14f6d8b66806764f8467f?sid=3fc79b46-ae32-46e3-8635-d0eee02e53b2>

Fixes #6987

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: Marie Stoppa <marie.stoppa@essec.edu>

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata-validation.service.ts

@@ -0,0 +1,48 @@
+import { Injectable } from '@nestjs/common';
+
+import { FieldMetadataSettings } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface';
+
+import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import {
+  FieldMetadataException,
+  FieldMetadataExceptionCode,
+} from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
+
+@Injectable()
+export class FieldMetadataValidationService<
+  T extends FieldMetadataType | 'default' = 'default',
+> {
+  constructor() {}
+
+  validateSettingsOrThrow({
+    fieldType,
+    settings,
+  }: {
+    fieldType: FieldMetadataType;
+    settings: FieldMetadataSettings<T>;
+  }) {
+    switch (fieldType) {
+      case FieldMetadataType.NUMBER:
+        this.validateNumberSettings(settings);
+        break;
+      default:
+        break;
+    }
+  }
+
+  private validateNumberSettings(settings: FieldMetadataSettings<T>) {
+    if ('decimals' in settings) {
+      const { decimals } = settings;
+
+      if (
+        decimals !== undefined &&
+        (decimals < 0 || !Number.isInteger(decimals))
+      ) {
+        throw new FieldMetadataException(
+          `Decimals value "${decimals}" must be a positive integer`,
+          FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
+        );
+      }
+    }
+  }
+}

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.module.ts

@@ -12,6 +12,7 @@ import { ActorModule } from 'src/engine/core-modules/actor/actor.module';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { FieldMetadataDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto';
+import { FieldMetadataValidationService } from 'src/engine/metadata-modules/field-metadata/field-metadata-validation.service';
 import { FieldMetadataResolver } from 'src/engine/metadata-modules/field-metadata/field-metadata.resolver';
 import { FieldMetadataGraphqlApiExceptionInterceptor } from 'src/engine/metadata-modules/field-metadata/interceptors/field-metadata-graphql-api-exception.interceptor';
 import { IsFieldMetadataDefaultValue } from 'src/engine/metadata-modules/field-metadata/validators/is-field-metadata-default-value.validator';
@@ -44,7 +45,11 @@ import { UpdateFieldInput } from './dtos/update-field.input';
         TypeORMModule,
         ActorModule,
       ],
-      services: [IsFieldMetadataDefaultValue, FieldMetadataService],
+      services: [
+        IsFieldMetadataDefaultValue,
+        FieldMetadataService,
+        FieldMetadataValidationService,
+      ],
       resolvers: [
         {
           EntityClass: FieldMetadataEntity,

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts

@@ -56,6 +56,7 @@ import { computeObjectTargetTable } from 'src/engine/utils/compute-object-target
 import { WorkspaceMigrationRunnerService } from 'src/engine/workspace-manager/workspace-migration-runner/workspace-migration-runner.service';
 import { ViewFieldWorkspaceEntity } from 'src/modules/view/standard-objects/view-field.workspace-entity';
 
+import { FieldMetadataValidationService } from './field-metadata-validation.service';
 import {
   FieldMetadataEntity,
   FieldMetadataType,
@@ -82,6 +83,7 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
     private readonly typeORMService: TypeORMService,
     private readonly workspaceMetadataVersionService: WorkspaceMetadataVersionService,
     private readonly twentyORMGlobalManager: TwentyORMGlobalManager,
+    private readonly fieldMetadataValidationService: FieldMetadataValidationService,
   ) {
     super(fieldMetadataRepository);
   }
@@ -157,6 +159,7 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       }
 
       this.validateFieldMetadataInput<CreateFieldInput>(
+        fieldMetadataInput.type,
         fieldMetadataInput,
         objectMetadata,
       );
@@ -391,6 +394,7 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       }
 
       this.validateFieldMetadataInput<UpdateFieldInput>(
+        existingFieldMetadata.type,
         fieldMetadataInput,
         objectMetadata,
       );
@@ -707,7 +711,11 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
 
   private validateFieldMetadataInput<
     T extends UpdateFieldInput | CreateFieldInput,
-  >(fieldMetadataInput: T, objectMetadata: ObjectMetadataEntity): T {
+  >(
+    fieldMetadataType: FieldMetadataType,
+    fieldMetadataInput: T,
+    objectMetadata: ObjectMetadataEntity,
+  ): T {
     if (fieldMetadataInput.name) {
       try {
         validateFieldNameValidityOrThrow(fieldMetadataInput.name);
@@ -748,6 +756,13 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
       }
     }
 
+    if (fieldMetadataInput.settings) {
+      this.fieldMetadataValidationService.validateSettingsOrThrow({
+        fieldType: fieldMetadataType,
+        settings: fieldMetadataInput.settings,
+      });
+    }
+
     return fieldMetadataInput;
   }
 }

packages/twenty-server/src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface.ts

@@ -12,6 +12,7 @@ type FieldMetadataDefaultSettings = {
 
 type FieldMetadataNumberSettings = {
   dataType: NumberDataType;
+  decimals?: number;
 };
 
 type FieldMetadataDateSettings = {