JavaScript: Using filters

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

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

Applying Filters

You must apply your filters to the end of your query. For example:

const \{ data, error \} = await supabase
  .from('cities')
  .select('name, country_id')
  .eq('name', 'The Shire')    // Correct

const \{ data, error \} = await supabase
  .from('cities')
  .eq('name', 'The Shire')    // Incorrect
  .select('name, country_id')

Chaining

Filters can be chained together to produce advanced queries. For example:

const \{ data, error \} = await supabase
  .from('cities')
  .select('name, country_id')
  .gte('population', 1000)
  .lt('population', 10000)

Conditional Chaining

Filters can be built up one step at a time and then executed. For example:

const filterByName = null
const filterPopLow = 1000
const filterPopHigh = 10000

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

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

const \{ data, error \} = await query