improvements to filters to allow multiple filters

web/app/book.py

 @book.route('/books')
 def get_books():
     view = request.args.get('view')
-    type = 'book'
-    books = Resource.query.filter_by(type=type).all()
+    resource_type = 'book'
+    books_query = Resource.query.filter_by(type=resource_type)
     for key in request.args.keys():
         if key != 'view':
             if key == 'practice':
-                books = Resource.query.join(Relationship, Relationship.first_resource_id == Resource.id, isouter=True).filter(Resource.type==type, Relationship.second_resource_id==request.args.get(key)).all()
-                also_books = Resource.query.join(Relationship, Relationship.second_resource_id == Resource.id, isouter=True).filter(Resource.type==type, Relationship.first_resource_id==request.args.get(key)).all()
-                books = books + also_books
-            else:
-                kwargs = {'type': type, key: request.args.get(key)}
-                books = Resource.query.filter_by(**kwargs).all()
+                books_1 = books_query.join(Relationship, Relationship.first_resource_id == Resource.id, isouter=True).filter(Relationship.second_resource_id==request.args.get(key))
+                books_2 = books_query.join(Relationship, Relationship.second_resource_id == Resource.id, isouter=True).filter(Relationship.first_resource_id==request.args.get(key))
+                books_query = books_1.union(books_2)
+            if key != 'practice':
+                kwargs = {key: request.args.get(key)}
+                books_query = books_query.filter_by(**kwargs)
+    # finalise the query
+    books = books_query.all()
     # get number of books
     count = len(books)
     if view != 'list':
     else: 
         # reorder books by book name
         books = sorted(books, key=lambda d: d.__dict__['name']) 
-    # get filters
+    # get values for filters
     # practices 
-    practices_filter = Resource.query.filter_by(type='practice').with_entities(Resource.id, Resource.name)
+    practices_filter = Resource.query.filter_by(type='practice').with_entities(Resource.id, Resource.name).all()
     # year
-    year_filter = get_filter_values('year', type)
+    year_filter = get_filter_values('year', resource_type)
     # typology
-    typology_filter = get_filter_values('typology', type)
-    return render_template('resources.html', resources=books, type=type, practices_filter=practices_filter, year_filter=year_filter, typology_filter=typology_filter, count=count, view=view)
+    typology_filter = get_filter_values('typology', resource_type)
+    return render_template('resources.html', resources=books, type=resource_type, practices_filter=practices_filter, year_filter=year_filter, typology_filter=typology_filter, count=count, view=view)
 
 # route for displaying a single book based on the ID in the database
 @book.route('/books/<int:book_id>')

web/app/templates/resources.html

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             <br/><br/>
-            <a href="{{ url_for(request.endpoint, view='list') }}">LIST VIEW</a>
+            <a href="{{ request.base_url }}?view=list{% for key in request.args %}{% if key != 'view' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}">
+              LIST VIEW
+            </a>
 
       </div>
       <div class="h-full ">
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for practice in practices_filter %}
                 <div {% if request.args.get('practice')==practice[0]|string %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, practice=practice[0]) }}" hx-target="#resources" hx-select="#resources">{{ practice[1] }}</a>
+                    <a href="{{ request.base_url }}?practice={{ practice[0] }}{% for key in request.args %}{% if key != 'practice' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ practice[1] }}</a>
                 </div>
                 {% endfor %}
                 </div>
                 <div class="filter-header">Year</div>
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for year in year_filter %}
-                <div  {% if request.args.get('year')==year %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, year=year) }}" hx-target="#resources" hx-select="#resources">{{ year }}</a>
+                <div  {% if year in request.args.getlist('year') %} class="active" {% endif %}>
+                    <a href="{{ request.base_url }}?year={{ year }}{% for key in request.args %}{% if key != 'year' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ year }}</a>
                 </div>
                 {% endfor %}
                 </div>
                 <div class="filter-header">Typology category</div>
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for typology in typology_filter %}
-                <div {% if request.args.get('typology')==typology %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, typology=typology) }}" hx-target="#resources" hx-select="#resources">{{ typology }}</a>
+                <div {% if typology in request.args.getlist('typology') %} class="active" {% endif %}>
+                    <a href="{{ request.base_url }}?typology={{ typology }}{% for key in request.args %}{% if key != 'typology' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ typology }}</a>
                 </div>
                 {% endfor %}
                 </div>
                 <div class="filter-header">Scripting languages</div>
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for language in languages_filter %}
-                <div {% if request.args.get('scriptingLanguage')==language %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, scriptingLanguage=language) }}" hx-target="#resources" hx-select="#resources">{{ language }}</a>
+                <div {% if language in request.args.getlist('scriptingLanguage') %} class="active" {% endif %}>
+                    <a href="{{ request.base_url }}?scriptingLanguage={{ language }}{% for key in request.args %}{% if key != 'scriptingLanguage' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ language }}</a>
                 </div>
                 {% endfor %}
                 </div>
                 <div class="filter-header">License</div>
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for license in licenses_filter %}
-                <div {% if request.args.get('license')==license %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, license=license) }}" hx-target="#resources" hx-select="#resources">{{ license }}</a>
+                <div {% if license in request.args.getlist('license') %} class="active" {% endif %}>
+                    <a href="{{ request.base_url }}?license={{ license }}{% for key in request.args %}{% if key != 'license' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ license }}</a>
                 </div>
                 {% endfor %}
                 </div>
                 <div class="filter-header">Status</div>
                 <div class="filter-options my-4" x-show="expandFilters">
                 {% for status in status_filter %}
-                <div {% if request.args.get('status')==status %} class="active" {% endif %}>
-                    <a href="{{ url_for(request.endpoint, status=status) }}" hx-target="#resources" hx-select="#resources">{{ status }}</a>
+                <div {% if status in request.args.getlist('status') %} class="active" {% endif %}>
+                    <a href="{{ request.base_url }}?status={{ status }}{% for key in request.args %}{% if key != 'status' %}&{{ key }}={{ request.args.get(key) }}{% endif %}{% endfor %}" hx-target="#resources" hx-select="#resources">{{ status }}</a>
                 </div>
                 {% endfor %}
                 </div>

web/app/tool.py

 @tool.route('/tools')
 def get_tools():
     view = request.args.get('view')
-    type = 'tool'
-    tools = Resource.query.filter_by(type=type).all()
+    resource_type = 'tool'
+    tools_query = Resource.query.filter_by(type=resource_type)
     for key in request.args.keys():
         if key != 'view':
             if key == 'practice':
-                tools = Resource.query.join(Relationship, Relationship.first_resource_id == Resource.id, isouter=True).filter(Resource.type==type, Relationship.second_resource_id==request.args.get(key)).all()
-                also_tools = Resource.query.join(Relationship, Relationship.second_resource_id == Resource.id, isouter=True).filter(Resource.type==type, Relationship.first_resource_id==request.args.get(key)).all()
-                tools = tools + also_tools
-            elif key == 'scriptingLanguage':
+                tools_1 = tools_query.join(Relationship, Relationship.first_resource_id == Resource.id, isouter=True).filter(Relationship.second_resource_id==request.args.get(key))
+                tools_2 = tools_query.join(Relationship, Relationship.second_resource_id == Resource.id, isouter=True).filter(Relationship.first_resource_id==request.args.get(key))
+                tools_query = tools_1.union(tools_2)
+            if key == 'scriptingLanguage':
                 regex = request.args.get(key) + "$|" + request.args.get(key) + "\s\/"
-                tools = Resource.query.filter_by(type=type).filter(Resource.scriptingLanguage.regexp_match(regex)).all()
-            else:
-                kwargs = {'type': type, key: request.args.get(key)}
-                tools = Resource.query.filter_by(**kwargs).all()
+                tools_query = tools_query.filter(Resource.scriptingLanguage.regexp_match(regex))
+            if key != 'practice' and key != 'scriptingLanguage':
+                kwargs = {key: request.args.get(key)}
+                tools_query = tools_query.filter_by(**kwargs)
+    # finalise the query
+    tools = tools_query.all()
     # get number of tools
     count = len(tools)
     if view != 'list':
     else: 
         # reorder tools by tools name
         tools = sorted(tools, key=lambda d: d.__dict__['name']) 
-    # get filters
+    # get values for filters
     # practices 
-    practices_filter = Resource.query.filter_by(type='practice').with_entities(Resource.id, Resource.name)
-    #FOR LATER: SELECT Resource.name, second.name FROM Resource LEFT JOIN Relationship ON Resource.id=Relationship.first_resource_id LEFT JOIN Resource second ON Relationship.second_resource_id=second.id;
+    practices_filter = Resource.query.filter_by(type='practice').with_entities(Resource.id, Resource.name).all()
     # license
-    licenses_filter = get_filter_values('license', type)
+    licenses_filter = get_filter_values('license', resource_type)
     # language
-    languages_filter = get_filter_values('scriptingLanguage', type)
+    languages_filter = get_filter_values('scriptingLanguage', resource_type)
     # status
-    status_filter = get_filter_values('status', type)
-    return render_template('resources.html', resources=tools, type=type, practices_filter=practices_filter, licenses_filter=licenses_filter, languages_filter=languages_filter, status_filter=status_filter, count=count, view=view)
+    status_filter = get_filter_values('status', resource_type)
+    return render_template('resources.html', resources=tools, type=resource_type, practices_filter=practices_filter, licenses_filter=licenses_filter, languages_filter=languages_filter, status_filter=status_filter, count=count, view=view)
 
 # route for displaying a single tool based on the ID in the database
 @tool.route('/tools/<int:tool_id>')