48 lines
1.8 KiB
Go
48 lines
1.8 KiB
Go
package gorethink
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import (
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p "gopkg.in/gorethink/gorethink.v2/ql2"
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)
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// InnerJoin returns the inner product of two sequences (e.g. a table, a filter result)
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// filtered by the predicate. The query compares each row of the left sequence
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// with each row of the right sequence to find all pairs of rows which satisfy
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// the predicate. When the predicate is satisfied, each matched pair of rows
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// of both sequences are combined into a result row.
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func (t Term) InnerJoin(args ...interface{}) Term {
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return constructMethodTerm(t, "InnerJoin", p.Term_INNER_JOIN, args, map[string]interface{}{})
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}
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// OuterJoin computes a left outer join by retaining each row in the left table even
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// if no match was found in the right table.
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func (t Term) OuterJoin(args ...interface{}) Term {
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return constructMethodTerm(t, "OuterJoin", p.Term_OUTER_JOIN, args, map[string]interface{}{})
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}
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// EqJoinOpts contains the optional arguments for the EqJoin term.
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type EqJoinOpts struct {
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Index interface{} `gorethink:"index,omitempty"`
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Ordered interface{} `gorethink:"ordered,omitempty"`
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}
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func (o EqJoinOpts) toMap() map[string]interface{} {
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return optArgsToMap(o)
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}
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// EqJoin is an efficient join that looks up elements in the right table by primary key.
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//
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// Optional arguments: "index" (string - name of the index to use in right table instead of the primary key)
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func (t Term) EqJoin(left, right interface{}, optArgs ...EqJoinOpts) Term {
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opts := map[string]interface{}{}
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if len(optArgs) >= 1 {
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opts = optArgs[0].toMap()
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}
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return constructMethodTerm(t, "EqJoin", p.Term_EQ_JOIN, []interface{}{funcWrap(left), right}, opts)
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}
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// Zip is used to 'zip' up the result of a join by merging the 'right' fields into 'left'
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// fields of each member of the sequence.
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func (t Term) Zip(args ...interface{}) Term {
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return constructMethodTerm(t, "Zip", p.Term_ZIP, args, map[string]interface{}{})
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}
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