Suggest as you type for values

[CharlesNepote]

Many properties could benefit from automatic suggestions based on current values.

Example:

• all boolean values (or closed to boolean): whether the awaited value is yes, no, maybe, 1, 0, -, the feature would suggest the 2, 3 or 4 always given values
• properties with few values; eg. when a barcode is used for different products, the multiple property could be yes, 2, 3, >3 (other values would not be useful)

Rationale

• Avoid creating complex types of values: data types, closed lists, taxonomies, etc.
• Follow one of the core Open Food Facts principle: let the users enter any data for their needs, and, eventually, standardize later on; this way, the standards or lists of values are led by the usages

Design

• It should show all the values before typing when the number of current values is less than 4-5
• Values should be sorted by most given values
• After typing the two first chars, it should show the X possible values containing these two chars
• It should not suggest anything when the number of possible values is more than 100 (?)
• The value entered should remain free. This feature does not constrain anything.

Implementation

• It should first ask the API for the /key statistics, to know how many values are existing.
• It should be possible to ask all values related to a property, see Geting values from all products with a particular property folksonomy_api#37