Flutter: Using filters

Filters allow you to only return rows that match certain conditions.

Filters can be used on select(), update(), and delete() queries.

If a Database function returns a table response, you can also apply filters.

Examples

Applying Filters

final data = await supabase
  .from('cities')
  .select('name, country_id')
  .eq('name', 'The Shire');  // Correct

final data = await supabase
  .from('cities')
  .eq('name', 'The Shire')  // Incorrect
  .select('name, country_id');

Chaining Filters

final data = await supabase
  .from('cities')
  .select('name, country_id')
  .gte('population', 1000)
  .lt('population', 10000)

Conditional Chaining

final filterByName = null;
final filterPopLow = 1000;
final filterPopHigh = 10000;

var query = supabase
  .from('cities')
  .select('name, country_id');

if (filterByName != null)  \{ query = query.eq('name', filterByName); \}
if (filterPopLow != null)  \{ query = query.gte('population', filterPopLow); \}
if (filterPopHigh != null) \{ query = query.lt('population', filterPopHigh); \}

final data = await query;

Filter by values within a JSON column

final data = await supabase
  .from('users')
  .select()
  .eq('address->postcode', 90210);

Filter Foreign Tables

final data = await supabase
  .from('countries')
  .select('''
    name,
    cities!inner (
      name
    )
  ''')
  .eq('cities.name', 'Bali');