@ladislaogarcia/prisma-zod-generator/src/helpers/include-helpers.ts

Prisma 2+ generator to emit Zod schemas from your Prisma schema

import { DMMF } from '@prisma/generator-helper';
import {
  checkIsModelRelationField,
  checkModelHasModelRelation,
  checkModelHasManyModelRelation,
} from './model-helpers';

export function addMissingInputObjectTypesForInclude(
  inputObjectTypes: DMMF.InputType[],
  models: DMMF.Model[],
  isGenerateSelect: boolean,
) {
  // generate input object types necessary to support ModelInclude with relation support
  const generatedIncludeInputObjectTypes = generateModelIncludeInputObjectTypes(
    models,
    isGenerateSelect,
  );

  for (const includeInputObjectType of generatedIncludeInputObjectTypes) {
    inputObjectTypes.push(includeInputObjectType);
  }
}
function generateModelIncludeInputObjectTypes(
  models: DMMF.Model[],
  isGenerateSelect: boolean,
) {
  const modelIncludeInputObjectTypes: DMMF.InputType[] = [];
  for (const model of models) {
    const { name: modelName, fields: modelFields } = model;
    const fields: DMMF.SchemaArg[] = [];

    for (const modelField of modelFields) {
      const { name: modelFieldName, isList, type } = modelField;

      const isRelationField = checkIsModelRelationField(modelField);

      if (isRelationField) {
        const field: DMMF.SchemaArg = {
          name: modelFieldName,
          isRequired: false,
          isNullable: false,
          inputTypes: [
            { isList: false, type: 'Boolean', location: 'scalar' },
            {
              isList: false,
              type: isList ? `${type}FindManyArgs` : `${type}Args`,
              location: 'inputObjectTypes',
              namespace: 'prisma',
            },
          ],
        };
        fields.push(field);
      }
    }

    /**
     * include is not generated for models that do not have a relation with any other models
     * -> continue onto the next model
     */
    const hasRelationToAnotherModel = checkModelHasModelRelation(model);
    if (!hasRelationToAnotherModel) {
      continue;
    }

    const hasManyRelationToAnotherModel = checkModelHasManyModelRelation(model);

    const shouldAddCountField = hasManyRelationToAnotherModel;
    if (shouldAddCountField) {
      const inputTypes: DMMF.SchemaArgInputType[] = [
        { isList: false, type: 'Boolean', location: 'scalar' },
      ];
      if (isGenerateSelect) {
        inputTypes.push({
          isList: false,
          type: `${modelName}CountOutputTypeArgs`,
          location: 'inputObjectTypes',
          namespace: 'prisma',
        });
      }
      const _countField: DMMF.SchemaArg = {
        name: '_count',
        isRequired: false,
        isNullable: false,
        inputTypes,
      };
      fields.push(_countField);
    }

    const modelIncludeInputObjectType: DMMF.InputType = {
      name: `${modelName}Include`,
      constraints: {
        maxNumFields: null,
        minNumFields: null,
      },
      fields,
    };
    modelIncludeInputObjectTypes.push(modelIncludeInputObjectType);
  }
  return modelIncludeInputObjectTypes;
}