add helper function GetGenreList - passes all genres to *.html, so horizontal "list" of checkboxes for book can be created

main.py

@@ -2,7 +2,7 @@ from flask import Flask, render_template, request
 from flask_sqlalchemy import SQLAlchemy
 from flask_marshmallow import Marshmallow
 from flask_bootstrap import Bootstrap
-from wtforms import SubmitField, StringField, HiddenField, SelectField, validators, Form
+from wtforms import SubmitField, StringField, HiddenField, SelectField, validators
 from flask_wtf import FlaskForm
 
 app = Flask(__name__)
@@ -17,7 +17,7 @@ Bootstrap(app)
 
 from author import Author, AuthorForm, AuthorSchema
 from publisher import Publisher, PublisherForm, PublisherSchema
-from genre import Genre, GenreForm, GenreSchema
+from genre import Genre, GenreForm, GenreSchema, GetGenreList
 from condition import Condition, ConditionForm, ConditionSchema
 from covertype import Covertype, CovertypeForm, CovertypeSchema
 from owned import Owned, OwnedForm, OwnedSchema
@@ -164,7 +164,8 @@ def book(id):
     book_form.owned.default = book.owned
     book_form.rating.default = book.rating
     book_form.process()
-    return render_template("book.html", books=book_s, subs=sub_book, book_form=book_form )
+    genre_list = GetGenreList()
+    return render_template("book.html", books=book_s, subs=sub_book, book_form=book_form, genre_list=genre_list )
 
 @app.route("/", methods=["GET"])
 def main_page():

templates/book.html

@@ -6,7 +6,26 @@
 			<div class="row">
 				<form class="form col-lg-12">
 				{% for key in keys %}
-{% if key == "condition" or key == "covertype" or key == "owned" or key == "rating" %}
+					{% if key == "genre" %}
+						<div class="form-row">
+							<label class="col-lg-2 col-form-label">{{key}}:</label>
+							<div class="form-row col-lg-10">
+								{% for genre in genre_list %}
+									{% set gname=genre.name %}
+									<div class="form-control col" style="margin-left:5px;margin-right:-5px;">
+									<input id="{{gname}}" name="{{gname}}" type="checkbox"
+									{% for book_g in books.genre %}
+										{% if book_g['name'] == gname %}
+											checked
+										{% endif %}
+									{% endfor %}
+									></input>
+									<label style="display:inline" for="{{gname}}" class="col-form-label">{{gname}}</label>
+								</div>
+								{% endfor %}
+							</div>
+						</div class="form-row">
+{% elif key == "condition" or key == "covertype" or key == "owned" or key == "rating" %}
 				<div class="form-row">
 					<label for="{{key}}" class="col-lg-2 col-form-label">{{key}}:</label>
 					<div class="col-lg-10">
@@ -56,8 +75,11 @@
 		{% if books.sub_book|length %}
 			<p>sub_book is defined: {{books.sub_book}}</p>
 		{% endif %}
+		{% if books.subs|length %}
+			<p>subs is defined {{ books.subs }}</p>
+		{% endif %}
 		{% if books.loan|length %}
 			<p>loan is defined: {{books.loan}}</p>
 		{% endif %}
-		{{ books.subs }}
+
 {% endblock main_content %}