Added basic categorization functionality in the server & UI

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

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+<h4 mat-dialog-title>Editing category {{category['name']}}</h4>
+
+<mat-dialog-content>
+    <mat-form-field>
+        <input matInput placeholder="Name" i18n-placeholder="Name" [(ngModel)]="category['name']">
+    </mat-form-field>
+
+    <h6 i18n="Rules">Rules</h6>
+
+    <mat-list>
+        <mat-list-item *ngFor="let rule of category['rules']; let i = index">
+            <mat-form-field [style.visibility]="i === 0 ? 'hidden' : null" class="operator-select">
+                <mat-select [disabled]="i === 0" [(ngModel)]="rule['preceding_operator']">
+                    <mat-option value="or">OR</mat-option>
+                    <mat-option value="and">AND</mat-option>
+                </mat-select>
+            </mat-form-field>
+            <mat-form-field class="property-select">
+                <mat-select [(ngModel)]="rule['property']">
+                    <mat-option *ngFor="let propertyOption of propertyOptions" [value]="propertyOption.value">{{propertyOption.label}}</mat-option>
+                </mat-select>
+            </mat-form-field>
+            <mat-form-field class="comparator-select">
+                <mat-select [(ngModel)]="rule['comparator']">
+                    <mat-option *ngFor="let comparatorOption of comparatorOptions" [value]="comparatorOption.value">{{comparatorOption.label}}</mat-option>
+                </mat-select>
+            </mat-form-field>
+            <mat-form-field class="value-input">
+                <input matInput [(ngModel)]="rule['value']">
+            </mat-form-field>
+            <button [disabled]="i === category['rules'].length-1" (click)="swapRules(i, i+1)" mat-icon-button><mat-icon>arrow_downward</mat-icon></button>
+            <button [disabled]="i === 0" (click)="swapRules(i, i-1)" mat-icon-button><mat-icon>arrow_upward</mat-icon></button>
+            <button (click)="removeRule(i)" mat-icon-button><mat-icon>cancel</mat-icon></button>
+        </mat-list-item>
+    </mat-list>
+
+    <button mat-icon-button (click)="addNewRule()" matTooltip="Add new rule" i18n-matTooltip="Add new rule tooltip"><mat-icon>add</mat-icon></button>
+</mat-dialog-content>
+
+<mat-dialog-actions>
+    <button mat-button mat-dialog-close><ng-container i18n="Cancel">Cancel</ng-container></button>
+
+    <button mat-button [disabled]="categoryChanged()" type="submit" (click)="saveClicked()"><ng-container i18n="Save button">Save</ng-container></button>
+    <div class="mat-spinner" *ngIf="updating">
+      <mat-spinner [diameter]="25"></mat-spinner>
+    </div>
+</mat-dialog-actions>

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

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+.operator-select {
+    width: 55px;
+}
+
+.property-select {
+    margin-left: 10px;
+    width: 110px;
+}
+
+.comparator-select {
+    margin-left: 10px;
+}
+
+.value-input {
+    margin-left: 10px;
+}

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

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { EditCategoryDialogComponent } from './edit-category-dialog.component';
+
+describe('EditCategoryDialogComponent', () => {
+  let component: EditCategoryDialogComponent;
+  let fixture: ComponentFixture<EditCategoryDialogComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ EditCategoryDialogComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(EditCategoryDialogComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

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

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+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);
+  }
+
+}