Delete Step

backend/index.js

@@ -51,6 +51,10 @@ app.use("/cases", casesIndexRoute);
 app.use("/cases", casesNewRoute);
 app.use("/cases", casesEditRoute);
 
+// "/steps"
+const stepsDeleteRoute = require("./routes/steps/delete")(sequelize);
+app.use("/steps", stepsDeleteRoute);
+
 // "/runs"
 const runsIndexRoute = require("./routes/runs/index")(sequelize);
 const runsNewRoute = require("./routes/runs/new")(sequelize);

backend/models/caseSteps.js

@@ -0,0 +1,31 @@
+function defineCaseStep(sequelize, DataTypes) {
+  const CaseStep = sequelize.define("CaseStep", {
+    caseId: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+    stepId: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+    stepNo: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+    },
+  });
+
+  CaseStep.associate = (models) => {
+    CaseStep.belongsTo(models.Case, {
+      foreignKey: "caseId",
+      onDelete: "CASCADE",
+    });
+    CaseStep.belongsTo(models.Step, {
+      foreignKey: "stepId",
+      onDelete: "CASCADE",
+    });
+  };
+
+  return CaseStep;
+}
+
+module.exports = defineCaseStep;

backend/routes/steps/delete.js

@@ -0,0 +1,51 @@
+const express = require("express");
+const router = express.Router();
+const defineStep = require("../../models/steps");
+const defineCaseStep = require("../../models/caseSteps");
+const { DataTypes, Op } = require("sequelize");
+
+module.exports = function (sequelize) {
+  const Step = defineStep(sequelize, DataTypes);
+  const CaseStep = defineCaseStep(sequelize, DataTypes);
+
+  router.delete("/:stepId", async (req, res) => {
+    const stepId = req.params.stepId;
+    const caseId = req.query.parentCaseId;
+
+    try {
+      const step = await Step.findByPk(stepId);
+      if (!step) {
+        return res.status(404).send("Step not found");
+      }
+
+      // Get caseStep to be deleted.
+      const deletingCaseStep = await CaseStep.findOne({
+        where: {
+          StepId: stepId,
+        },
+      });
+
+      // Decrease stepNo for all caseSteps with greater than the caseStep to be deleted.
+      await CaseStep.update(
+        { stepNo: sequelize.literal("stepNo - 1") },
+        {
+          where: {
+            CaseId: caseId,
+            stepNo: {
+              [Op.gt]: deletingCaseStep.stepNo,
+            },
+          },
+        }
+      );
+
+      await step.destroy();
+
+      res.status(204).send();
+    } catch (error) {
+      console.error(error);
+      res.status(500).send("Internal Server Error");
+    }
+  });
+
+  return router;
+};