Added basic categorization functionality in the server & UI

src/app/dialogs/edit-category-dialog/edit-category-dialog.component.ts

@@ -0,0 +1,110 @@
+import { Component, OnInit, Inject } from '@angular/core';
+import { MAT_DIALOG_DATA } from '@angular/material/dialog';
+import { PostsService } from 'app/posts.services';
+
+@Component({
+  selector: 'app-edit-category-dialog',
+  templateUrl: './edit-category-dialog.component.html',
+  styleUrls: ['./edit-category-dialog.component.scss']
+})
+export class EditCategoryDialogComponent implements OnInit {
+
+  updating = false;
+  original_category = null;
+  category = null;
+
+  propertyOptions = [
+    {
+      value: 'fulltitle',
+      label: 'Title'
+    },
+    {
+      value: 'id',
+      label: 'ID'
+    },
+    {
+      value: 'webpage_url',
+      label: 'URL'
+    },
+    {
+      value: 'view_count',
+      label: 'Views'
+    },
+    {
+      value: 'uploader',
+      label: 'Uploader'
+    },
+    {
+      value: '_filename',
+      label: 'File Name'
+    },
+    {
+      value: 'tags',
+      label: 'Tags'
+    }
+  ];
+
+  comparatorOptions = [
+    {
+      value: 'includes',
+      label: 'includes'
+    },
+    {
+      value: 'not_includes',
+      label: 'not includes'
+    },
+    {
+      value: 'equals',
+      label: 'equals'
+    },
+    {
+      value: 'not_equals',
+      label: 'not equals'
+    },
+
+  ];
+
+  constructor(@Inject(MAT_DIALOG_DATA) public data: any, private postsService: PostsService) {
+    if (this.data) {
+      this.original_category = this.data.category;
+      this.category = JSON.parse(JSON.stringify(this.original_category));
+    }
+  }
+
+  ngOnInit(): void {
+  }
+
+  addNewRule() {
+    this.category['rules'].push({
+      preceding_operator: 'or',
+      property: 'fulltitle',
+      comparator: 'includes',
+      value: ''
+    });
+  }
+
+  saveClicked() {
+    this.updating = true;
+    this.postsService.updateCategory(this.category).subscribe(res => {
+      this.updating = false;
+      this.original_category = JSON.parse(JSON.stringify(this.category));
+    }, err => {
+      this.updating = false;
+      console.error(err);
+    });
+  }
+
+  categoryChanged() {
+    return JSON.stringify(this.category) === JSON.stringify(this.original_category);
+  }
+
+  swapRules(original_index, new_index) {
+    [this.category.rules[original_index], this.category.rules[new_index]] = [this.category.rules[new_index],
+                                                                            this.category.rules[original_index]];
+  }
+
+  removeRule(index) {
+    this.category['rules'].splice(index, 1);
+  }
+
+}