generator-fastboot/generators/database-changelog/index.js

Spring Boot + Angular/React/Vue in one handy generator

/**
 * Copyright 2013-2021 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see https://www.jhipster.tech/
 * for more information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const fs = require('fs');
const { JHIPSTER_CONFIG_DIR } = require('../generator-constants');
const BaseGenerator = require('../generator-base');

const BASE_CHANGELOG = {
  addedFields: [],
  removedFields: [],
  addedRelationships: [],
  removedRelationships: [],
};

module.exports = class extends BaseGenerator {
  constructor(args, options) {
    super(args, options, { unique: 'namespace' });

    this.argument('entities', {
      desc: 'Which entities to generate a new changelog',
      type: Array,
      required: false,
    });

    if (this.options.help) {
      return;
    }
    this.info(`Creating changelog for entities ${this.options.entities}`);
    this.configOptions.oldSharedEntities = this.configOptions.oldSharedEntities || [];
  }

  _default() {
    return {
      calculateChangelogs() {
        const diff = this._generateChangelogFromFiles();

        diff.forEach(([fieldChanges, _relationshipChanges]) => {
          if (fieldChanges.type === 'entity-new') {
            this._composeWithIncrementalChangelogProvider(fieldChanges);
          } else if (fieldChanges.addedFields.length > 0 || fieldChanges.removedFields.length > 0) {
            this._composeWithIncrementalChangelogProvider(fieldChanges);
          }
        });

        diff.forEach(([_fieldChanges, relationshipChanges]) => {
          if (
            relationshipChanges &&
            relationshipChanges.incremental &&
            (relationshipChanges.addedRelationships.length > 0 || relationshipChanges.removedRelationships.length > 0)
          ) {
            this._composeWithIncrementalChangelogProvider(relationshipChanges);
          }
        });
      },
    };
  }

  get default() {
    return this._default();
  }

  /* ======================================================================== */
  /* private methods use within generator                                     */
  /* ======================================================================== */

  _composeWithIncrementalChangelogProvider(databaseChangelog) {
    const skipWriting = !this.options.entities.includes(databaseChangelog.entityName);
    this.composeWithJHipster('database-changelog-liquibase', {
      databaseChangelog,
      skipWriting,
      configOptions: this.configOptions,
    });
  }

  /**
   * Generate changelog from differences between the liquibase entity and current entity.
   */
  _generateChangelogFromFiles() {
    // Compare entity changes and create changelogs
    return this.getExistingEntityNames().map(entityName => {
      const filename = this.destinationPath(JHIPSTER_CONFIG_DIR, `${entityName}.json`);

      const newConfig = this.fs.readJSON(filename);
      const newFields = (newConfig.fields || []).filter(field => !field.transient);
      const newRelationships = newConfig.relationships || [];

      if (
        this.configOptions.recreateInitialChangelog ||
        !this.jhipsterConfig.incrementalChangelog ||
        !fs.existsSync(filename) ||
        !fs.existsSync(
          this.destinationPath(`src/main/resources/config/liquibase/changelog/${newConfig.changelogDate}_added_entity_${entityName}.xml`)
        )
      ) {
        return [
          {
            ...BASE_CHANGELOG,
            incremental: newConfig.incrementalChangelog,
            changelogDate: newConfig.changelogDate,
            type: 'entity-new',
            entityName,
          },
        ];
      }
      this._debug(`Calculating diffs for ${entityName}`);

      const oldConfig = JSON.parse(fs.readFileSync(filename));
      // Share old entity
      this.configOptions.oldSharedEntities[entityName] = oldConfig;

      const oldFields = (oldConfig.fields || []).filter(field => !field.transient);
      const oldFieldNames = oldFields.map(field => field.fieldName);
      const newFieldNames = newFields.map(field => field.fieldName);

      // Calculate new fields
      const addedFieldNames = newFieldNames.filter(fieldName => !oldFieldNames.includes(fieldName));
      const addedFields = addedFieldNames.map(fieldName => newFields.find(field => fieldName === field.fieldName));
      // Calculate removed fields
      const removedFieldNames = oldFieldNames.filter(fieldName => !newFieldNames.includes(fieldName));
      const removedFields = removedFieldNames.map(fieldName => oldFields.find(field => fieldName === field.fieldName));

      const newRelationshipNames = newRelationships.map(relationship => relationship.relationshipName);
      const oldRelationships = oldConfig.relationships || [];
      const oldRelationshipNames = oldRelationships.map(relationship => relationship.relationshipName);

      // Calculate new relationships
      const addedRelationshipNames = newRelationshipNames.filter(relationshipName => !oldRelationshipNames.includes(relationshipName));
      const addedRelationships = addedRelationshipNames.map(relationshipName =>
        newRelationships.find(relationship => relationshipName === relationship.relationshipName)
      );
      // Calculate removed relationships
      const removedRelationshipNames = oldRelationshipNames.filter(relationshipName => !newRelationshipNames.includes(relationshipName));
      const removedRelationships = removedRelationshipNames.map(relationshipName =>
        oldRelationships.find(relationship => relationshipName === relationship.relationshipName)
      );

      return [
        { ...BASE_CHANGELOG, incremental: true, type: 'entity-update', entityName, addedFields, removedFields },
        { ...BASE_CHANGELOG, incremental: true, type: 'entity-update', entityName, addedRelationships, removedRelationships },
      ];
    });
  }
};