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ConfiForms filters is the core component of the app and is used absolutely everywhere where you need to describe a condition, filter the dataset or setup the behaviour (field and IFTTT rules)

In this example we will be more focused on filtering the data, but will also touch the basics of a conditionally applied rules

Let's consider these forms that will, logically, build the bookshelf. Each book can be taken for reading and returned when ready. We will have a form for storing this state and couple of forms to store the data about the book and the author(s)

We have 3 forms

• bookshelf
• books
• author

linked together using smart fields (see how on the right, in data structures section)

So, one book may have multiple authors and is on a bookshelf

Data structures:

status=taken&takenBy=[entry._user]

status=avail&takenBy=

[entry.lastName], [entry.firstName]

Form "books" has an IFTTT rule to "auto-create" a record in the "bookshelf" form when a new book is added

To show all books, we will leave filter property empty

To show only available books we should use for filter expression: status:avail, where status is the field name of bookshelf form and avail is the id of one of the status values in dropdown list

To show books taken only by current user, we should use for filter expression: takenBy:[entry._user], where takenBy is the field name and _user is built-in property of form to get value of current user

To find books which title starts from word "The", we should use for filter expression: The* 

To find books which any field starts from word "Bridget'', we should use for filter expression: Bridget* 

Bridget*

Transformation of authors:  book.authors.transform(lastName.append([entry.firstName.prepend(, )]))

To find books which any field ends with word "love", we should use for filter expression: * love

To find books which any field contains word "and", we should use for filter expression: *and*

To find books which authors born before 01.01.1950, we should use for filter expression:  book.authors.dob.formatDate(yyyyMMdd):<19500101 , where book. is the bookshelf form's field of Smart Dropdown type, which is reference to books form record and authors. in its turn is the books form's field of Smart Multiselect type, which is reference to author form record and dob is the field name of author form, which is transformed by virtual function formatDate.

To find books which status is Available and title starts with word 'The', we should use for filter expression logical operations: 

book.title:The* AND status:avail

To find books which title starts with word 'The' or available books of Jojo Moyes, we should use for filter expression logical operations: 

book.title:The* OR book.authors.lastName:Moyes AND status:avail

To find books that were registered without authors, we should use for filter expression: book.authors:[empty]

To find books that were registered today, we should use for filter expression:  created:[today]

To find books with more than one author, we should use virtual function asCount in filter expression: book.authors.asCount:>1

To find books with only single author, we will use symbol ! to reverse the previous expression in filter: !book.authors.asCount:>1

Show taken books only for logged in users